Polishing solution, preparation method thereof and aluminum alloy polishing method

Abstract

The invention relates to a polishing solution, a preparation method thereof and an aluminum alloy polishing method. The polishing solution comprises a lubricant, a corrosion inhibitor, an antirust agent and a solvent; wherein the lubricant comprises at least one of the following characteristics: (1) the lubricant comprises oleic acid diethanolamine molybdic acid; (2) the lubricant comprises an organic lubricant and an inorganic lubricant, the inorganic lubricant comprises inorganic molybdenum salt, and the organic lubricant comprises at least one of coconut oil diethanolamide, polyol ester and ricinoleate; the corrosion inhibitor comprises one of the following characteristics: (1) isomeric alcohol phosphate; and (2) at least one of phosphate ester, siloxane ketone, cyclocarboxypropyl oleic acid and polyoxyethylene oleate, and an anionic surfactant. The polishing solution can effectively prevent the phenomenon of poor brightness or burnishing caused by drying of a lubricating film due to friction heat in the polishing process, effectively reduces pinhole-shaped corrosion pits, and can effectively improve the polishing brightness at the same time.

Description

Technical Field

[0001] The present application relates to the field of surface treatment technology, and in particular to a polishing liquid and a preparation method thereof, and a polishing method for aluminum alloys. Background Art

[0002] 7075 aluminum alloy is mainly composed of Al-Zn-Mg-Cu. Due to its high strength and low density, it is widely used in the manufacture of aircraft fuselage frames, wings, landing gear and other components. It is also used in missile and tank parts, high-end mold manufacturing, bicycle parts, sports equipment and other fields.

[0003] The 7075 aluminum alloy composed of Al-Zn-Mg-Cu is a sensitive aluminum material. When it is polished with traditional silica sol polishing liquid or alumina powder polishing liquid, there are phenomena such as poor brightness and fogging, which leads to frequent fogging of the mirror polishing of 7075 aluminum alloy, low efficiency and high rework cost.

[0004] Therefore, it is necessary to improve the traditional technology. Summary of the invention

[0005] Based on this, the present application provides a polishing liquid that can effectively improve brightness, a preparation method thereof, and a polishing method for aluminum alloy.

[0006] The technical solution of this application to solve the above technical problems is as follows.

[0007] On the one hand, the present application provides a polishing liquid, including a lubricant, a corrosion inhibitor, a rust inhibitor and a solvent;

[0008] Wherein, the lubricant includes at least one of the following characteristics:

[0009] (1) The lubricant includes oleic acid, diethanolamine, molybdic acid;

[0010] (2) The lubricant includes an organic lubricant and an inorganic lubricant, the inorganic lubricant includes an inorganic molybdenum salt, and the organic lubricant includes at least one of coconut oil diethanolamide, polyol ester and ricinoleic acid ester;

[0011] The corrosion inhibitor includes one of the following characteristics:

[0012] (1) Isomeric alcohol phosphates;

[0013] (2) at least one of phosphate ester, silicone ketone, cyclopropyl oleic acid and polyoxyethylene oleate and an anionic surfactant.

[0014] In some embodiments, in the polishing liquid, the lubricant includes oleic acid diethanolamine molybdic acid and oleic acid diethanolamine thiophosphate.

[0015] In some embodiments, in the polishing liquid, the mass ratio of the oleic acid diethanolamine molybdic acid to the oleic acid diethanolamine thiophosphate is 1:3-7.

[0016] In some of the embodiments, in the polishing liquid, the inorganic molybdenum salt includes at least one of sodium molybdate, ammonium molybdate, magnesium molybdate and zinc molybdate.

[0017] In some of the embodiments, in the polishing liquid, the mass ratio of the inorganic lubricant to the organic lubricant is 1:2.5-8.

[0018] In some embodiments, in the polishing liquid, the isomeric alcohol phosphate includes C3~C 20 Isomeric alcohol phosphates.

[0019] In some embodiments, in the polishing liquid, the C3~C 20 Isomeric alcohol phosphates include C3~C 20 Isopropyl alcohol polyoxyethylene ether phosphate.

[0020] In some embodiments, in the polishing liquid, the anionic surfactant includes alkyl polyoxyethylene ether phosphate salt.

[0021] In some embodiments, in the polishing liquid, the alkyl polyoxyethylene ether phosphate salt includes at least one of alkyl polyoxyethylene ether phosphate ammonium salt and alkyl polyoxyethylene ether phosphate sodium salt.

[0022] In some of the embodiments, in the polishing liquid, the carbon number of the alkyl group in the alkyl polyoxyethylene ether phosphate salt is 10-14.

[0023] In some of the embodiments, in the polishing liquid, the mass ratio of at least one of the phosphate ester, siloxane ketone, cyclopropyl oleic acid and polyoxyethylene oleate to the anionic surfactant is 1:1.5-8.

[0024] In some embodiments, in the polishing liquid, the rust inhibitor includes borate.

[0025] In some embodiments, in the polishing liquid, the borate ester includes at least one of triethanolamine borate and isomeric borate ester DX1662.

[0026] In some of the embodiments, in the polishing liquid, the mass ratio of the lubricant to the corrosion inhibitor is 1:0.1-2.5.

[0027] In some of the embodiments, in the polishing liquid, the mass ratio of the lubricant to the rust inhibitor is 1:0.5~2.5.

[0028] In some of the embodiments, the polishing liquid includes, by mass percentage, 3% to 10% lubricant, 1% to 8% corrosion inhibitor, 5% to 8% rust inhibitor and 74% to 91% solvent.

[0029] In some embodiments, in the polishing liquid, the solvent includes water.

[0030] The present application provides a method for preparing the above-mentioned polishing liquid, comprising the following steps:

[0031] The lubricant, corrosion inhibitor, rust inhibitor and solvent are mixed to prepare the polishing solution.

[0032] On the one hand, the present application provides a polishing method for aluminum alloy, comprising the following steps:

[0033] The aluminum alloy to be polished is mechanically polished using the polishing liquid or the polishing liquid prepared by the preparation method.

[0034] In some of the embodiments, in the method for polishing an aluminum alloy, the aluminum alloy includes an Al-Zn-Mg-Cu aluminum alloy.

[0035] Compared with the prior art, the polishing liquid of the present application has the following beneficial effects:

[0036] The polishing liquid of the present application includes a lubricant, a corrosion inhibitor, a rust inhibitor and a solvent; the specific type of lubricant and the specific type of corrosion inhibitor work together with the rust inhibitor and the solvent to effectively prevent the lubricating film from drying out due to frictional heat during the polishing process, thereby causing poor brightness or blurring, effectively reduce the appearance of pinhole-shaped corrosion pits, effectively reduce the oxidative corrosion phenomenon at the location of liquid accumulation after polishing, and effectively improve the polishing brightness.

[0037] The polishing liquid of the present application can be used for hard alloys such as stainless steel, and is particularly suitable for polishing Al-Zn-Mg-Cu sensitive aluminum alloys. It can effectively solve the problems of poor brightness and blurring when polishing Al-Zn-Mg-Cu sensitive aluminum alloys using traditional silica sol polishing liquid or alumina powder polishing liquid.

[0038] After polishing with the polishing liquid of the present application, the polishing residue is extremely easy to rinse off, without the need to use additional combinations of multiple cleaning agents or special cleaning equipment with more than 10 tanks, which can effectively reduce cleaning costs and effectively improve cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more completely understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should also be noted that the drawings are all drawn in a simplified form and are only used to conveniently and clearly assist in explaining the present application. The various sizes of each component shown in the drawings are arbitrarily shown and may be accurate or may not be drawn according to the actual scale. For example, in order to make the illustration clearer, the size of the components is appropriately exaggerated in some places in the drawings. Unless otherwise specified, the components in the figure are not drawn to scale. This application does not limit each size of each component.

[0040] Figure 1 This is a surface condition diagram of the Al-Zn-Mg-Cu aluminum alloy after polishing with the polishing liquid prepared in Example 1;

[0041] Figure 2 This is a surface condition diagram of the Al-Zn-Mg-Cu aluminum alloy after being polished with the polishing liquid prepared in Example 1, cleaned, and dried with an air gun;

[0042] Figure 3 This is a surface condition diagram of the Al-Zn-Mg-Cu aluminum alloy after polishing with the polishing liquid prepared in Comparative Example 1;

[0043] Figure 4 This is a detailed picture of the surface condition of the Al-Zn-Mg-Cu aluminum alloy after polishing with the polishing liquid prepared in Comparative Example 1;

[0044] Figure 5 This is a surface condition diagram of the Al-Zn-Mg-Cu aluminum alloy after polishing with the polishing liquid prepared in Comparative Example 1, cleaning and air gun drying. DETAILED DESCRIPTION

[0045] The present application will be further described in detail below in conjunction with the accompanying drawings, embodiments and examples. It should be understood that these embodiments and examples are only used to illustrate the present application and are not used to limit the scope of the present application. The purpose of providing these embodiments and examples is to make the understanding of the disclosure of the present application more thorough and comprehensive. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various changes or modifications without violating the connotation of the present application, and the equivalent form obtained also falls within the protection scope of the present application. For example, the features described or described as part of an embodiment can be combined in another embodiment in a suitable manner to produce a new embodiment. In addition, in the description below, a large number of specific details are given in order to provide a more comprehensive understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing implementation modes and embodiments and are not intended to limit this application.

[0047] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0048] In the present application, "plurality", "multiple", "multiple times", etc., unless otherwise specified, refer to a number greater than 2 or equal to 2. For example, "one or more" means one or greater than or equal to two.

[0049] As used herein, "combination thereof", "any combination thereof", "any combination thereof" etc. include all suitable combinations of any two or more of the listed items.

[0050] Herein, the “suitable” mentioned in “suitable combination”, “suitable method”, “any suitable method”, etc., shall be based on the ability to implement the technical solution of this application, solve the technical problems of this application, and achieve the expected technical effects of this application.

[0051] Herein, "preferred", "better", "more preferred", and "suitable" are only used to describe implementation methods or examples with better effects, and it should be understood that they do not constitute a limitation on the scope of protection of this application. If multiple "preferred" items appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "preferred" item is independent.

[0052] In the present application, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of the present application.

[0053] In this application, "optionally", "optional", and "optional" mean optional or dispensable, that is, any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0054] In the present application, the terms "first", "second", "third", "fourth", etc. in "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0055] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0056] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum value and the maximum value) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers in the numerical interval, it includes the two endpoint integers of the numerical range, and each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical range disclosed herein should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows broadly including numerical interval types such as percentage intervals, ratio intervals, and ratio intervals.

[0057] The temperature parameters in this application, unless otherwise specified, are allowed to be either constant temperature treatment or to vary within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within the range of ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are allowed.

[0058] In this application, the term "room temperature" or "normal temperature" generally refers to 4°C to 35°C, for example, 20°C ± 5°C. In some embodiments of this application, "room temperature" or "normal temperature" refers to 10°C to 30°C. In some embodiments of this application, "room temperature" or "normal temperature" refers to 20°C to 30°C.

[0059] In this application, when referring to the unit of a data range, if there is a unit only after the right endpoint, it means that the units of the left and right endpoints are the same. For example, 3~5 h means that the units of the left endpoint "3" and the right endpoint "5" are both h (hours).

[0060] All documents mentioned in this application are cited as references in this application, just as each document is cited as reference separately. Unless they conflict with the invention purpose and / or technical solution of this application, the cited documents involved in this application are cited with all contents and all purposes. When the cited documents are involved in this application, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When the cited documents are involved in this application, the examples and preferred methods of the cited relevant technical features can also be incorporated into this application as references, but are limited to the implementation of this application. It should be understood that when the cited content conflicts with the description in this application, the present application shall prevail or be modified adaptively according to the description of this application.

[0061] The mass or weight of the relevant components mentioned in the specification of the embodiments of the present application may not only refer to the specific content of each component, but also indicate the proportional relationship of the mass or weight between the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the specification of the embodiments of the present application, it is within the scope disclosed in the specification of the embodiments of the present application. Specifically, the mass or weight described in the specification of the embodiments of the present application may be units known in the chemical industry such as μg, mg, g, and kg.

[0062] After research and analysis, it is believed that the reasons for the poor brightness and haziness when polishing with traditional silica sol polishing liquid or alumina powder polishing liquid include:

[0063] First, in 7075 aluminum alloy, Al-Zn-Mg metal has active chemical properties, and it is easy to undergo conventional chemical corrosion in liquid containing electrolytes; secondly, the three active metals of Al-Zn-Mg have a certain potential difference with Cu, and it is easy to undergo electrochemical corrosion similar to a galvanic cell in liquid; in addition, Al-Zn-Mg metal is highly active, and the polishing friction area is easy to dry during chemical mechanical polishing (CMP polishing), resulting in imperceptible raw wear. When polishing it with traditional silica sol polishing liquid with a particle size of 20~30 nanometers or alumina powder polishing liquid with a particle size of 0.2~0.5 microns, the following situations and reasons occur:

[0064] 1. When the friction area becomes hot, the lubricating film formed by the leveling of the polishing liquid will dry up, and the friction will increase rapidly, causing the part being rubbed to be dim and dim. At this time, it will be identified as dirty by the person in charge of polishing and sent to the cleaning process, but the cleaning process cannot solve the problem.

[0065] 2. White pinholes appear in the polishing area, which will be identified by the polishing person in charge as impurities with large hard particles mixed in the polishing liquid, causing punctures. Analysis shows that the cause of this problem is that the polishing liquid contains chloride ion corrosion. Because the chloride ion has a small radius, is easy to penetrate, and has strong reducing properties, the small droplets of chloride ions gathered during the polishing friction process react with the active metal of Al-Zn-Mg to form white pinhole-shaped corrosion pits.

[0066] 3. The polishing area has hazy marks (irregular stripe flow marks, quasi-circular, quasi-circular), light hazy color (light blue, light brown, light gray), which will be identified as hazy dirt by the person in charge of polishing and pushed to the cleaning process, but the cleaning process cannot solve it. When more polishing liquid gathers at this position during the polishing deceleration pause, coupled with the polishing friction heat, the polishing residual liquid gathered at this position can oxidize and corrode the aluminum alloy covered by this residual liquid within 20 seconds. The shape of the hazy area is determined by the traces of polishing liquid gathered at this position, and the appearance color of the haze is determined by the hue of the polishing liquid. For example: the oxidation spots at the stripe-shaped liquid gathering position show corresponding stripe-shaped flow mark-shaped hazy spots. If there is a blue phase silicon oxide component in the polishing liquid at this time, it will show a blue stripe-shaped flow mark-shaped hazy spot, that is, blue haze; when the yellow sulfur component or active oxygen in the polishing liquid is present, it will show a light yellow haze, that is, yellow haze; when there is aluminum oxide in the polishing liquid, it will show a light white haze, that is, white haze.

[0067] 4. After CMP polishing, the product will be soaked in pure water and the spots will be identified as dirty by the polishing person in charge and sent to the cleaning process, but the cleaning process cannot solve the problem. Analysis shows that the cause of this problem is the poor rust resistance of the polishing liquid. During the polishing process, a complete anti-rust film is not formed in some parts. After polishing, the aluminum alloy surface is very sensitive to become a brand new surface. When the product is picked up after soaking in water, water droplets will gather in the area without anti-rust film. After the product stays in the air for 20 to 30 seconds, the brand new surface where the water droplets gather will be quickly oxidized by the gathered water droplets to form spots.

[0068] An embodiment of the present application provides a polishing liquid, including a lubricant, a corrosion inhibitor, a rust inhibitor and a solvent; wherein the lubricant includes at least one of the following characteristics:

[0069] (1) Lubricants include oleic acid, diethanolamine, molybdic acid;

[0070] (2) The lubricant includes an organic lubricant and an inorganic lubricant, the inorganic lubricant includes an inorganic molybdenum salt, and the organic lubricant includes at least one of coconut oil diethanolamide, polyol ester and ricinoleic acid ester;

[0071] The corrosion inhibitor includes one of the following characteristics:

[0072] (1) Isomeric alcohol phosphates;

[0073] (2) at least one of phosphate ester, silicone ketone, cyclopropyl oleic acid and polyoxyethylene oleate and an anionic surfactant.

[0074] The polishing liquid of the present application includes a lubricant, a corrosion inhibitor, a rust inhibitor and a solvent; the specific type of lubricant and the specific type of corrosion inhibitor work together with the rust inhibitor and the solvent to effectively prevent the lubricating film from drying out due to frictional heat during the polishing process, thereby causing poor brightness or blurring, effectively reduce the appearance of pinhole-shaped corrosion pits, effectively reduce the oxidative corrosion phenomenon at the location of liquid accumulation after polishing, and effectively improve the polishing brightness.

[0075] The polishing liquid of the present application can be used for hard alloys such as stainless steel, and is particularly suitable for polishing Al-Zn-Mg-Cu sensitive aluminum alloys. It can effectively solve the problems of poor brightness and blurring when polishing Al-Zn-Mg-Cu sensitive aluminum alloys using traditional silica sol polishing liquid or alumina powder polishing liquid.

[0076] After polishing with the polishing liquid of the present application, the polishing residue is extremely easy to rinse off, without the need to use additional combinations of multiple cleaning agents or special cleaning equipment with more than 10 tanks, which can effectively reduce cleaning costs and effectively improve cleaning efficiency.

[0077] The structural formula of oleic acid diethanolamine molybdic acid is as follows:

[0078]

[0079] In some of the examples, in the polishing liquid, the lubricant includes diethanolamine oleate molybdate and diethanolamine oleate thiophosphate.

[0080] The combination of oleic acid diethanolamine molybdic acid and oleic acid diethanolamine thiophosphate as lubricants in the polishing liquid can further reduce or avoid the phenomenon of poor brightness or blurring caused by the drying of the lubricating film due to friction heat during the polishing process.

[0081] In some of these examples, in the polishing slurry, the lubricant includes a water-based molybdenum extreme pressure lubricant.

[0082] In some of the examples, in the polishing liquid, the lubricant includes XP2022 water-based molybdenum extreme pressure lubricant. Here, XP2022 is the model of a commercial water-based molybdenum extreme pressure lubricant, and in this application, the model is not limited.

[0083] It can be understood that XP2022 water-based molybdenum extreme pressure lubricant includes oleic acid diethanolamine molybdic acid and oleic acid diethanolamine thiophosphate.

[0084] In some of the examples, in the polishing liquid, the mass ratio of diethanolamine oleate molybdic acid to diethanolamine oleate thiophosphate is 1:3~7.

[0085] It can be understood that the mass ratio of oleic acid diethanolamine molybdic acid to oleic acid diethanolamine thiophosphate includes but is not limited to 1:3, 1:4, 1:5, 1:6, and 1:7; in some examples, it can be within the range formed by any two of these point values ​​as end values, the same below.

[0086] It can be understood that the above-mentioned specific type of lubricant works in conjunction with other components to effectively prevent the lubricating film from drying out due to frictional heat during polishing, which causes poor brightness or fogging. If only molybdate is used as a lubricant, the residue after polishing has strong adhesion and is not easy to be cleaned off.

[0087] In some of the examples, in the polishing liquid, the inorganic molybdenum salt includes at least one of sodium molybdate, ammonium molybdate, magnesium molybdate and zinc molybdate.

[0088] In some of the examples, the mass ratio of inorganic lubricant to organic lubricant in the polishing liquid is 1:2.5~8.

[0089] It can be understood that the mass ratio of the inorganic lubricant to the organic lubricant includes but is not limited to 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, and 1:8.

[0090] In some of these examples, the lubricant in the polishing slurry has a temperature resistance of ≥900°C.

[0091] It can be understood that oxidation deformation will not occur at this temperature.

[0092] In some of these examples, the coefficient of friction of the lubricant in the polishing fluid is ≤ 0.15.

[0093] In some of these examples, the corrosion inhibitor in the polishing solution is an isomeric alcohol phosphate ester.

[0094] In other examples, in the polishing liquid, the corrosion inhibitor is at least one of phosphate ester, siloxane ketone, cyclopentyl oleic acid and polyoxyethylene oleate, and an anionic surfactant.

[0095] It can be understood that the "phosphate ester" in "the corrosion inhibitor is at least one of phosphate ester, silicone ketone, cyclopropyl oleic acid and oleic acid polyoxyethylene ester and anionic surfactant" includes at least one of isomeric alcohol phosphate ester and non-isomerized alcohol phosphate ester; it can be further understood that the "isomeric alcohol phosphate ester" of the present application is a product generated by the esterification reaction of an alcohol compound with phosphoric acid, and the phosphate group in its molecular structure includes an isomerized alcohol group; the "non-isomerized alcohol phosphate ester" of the present application refers to a phosphate ester that does not contain an isomerized alcohol group, which can be divided into monoalkyl phosphate ester ROPOPO(OH)2, dialkyl phosphate ester (RO)2PO(OH) and trialkyl phosphate ester (RO)3PO according to the degree of esterification, wherein R represents C3~C20 Isomeric alcohol groups.

[0096] In some of these examples, the isomeric alcohol phosphates in the polishing liquid include C3~C 20 Isomeric alcohol phosphates.

[0097] It is understandable that "C3~C 20 " refers to that the carbon number of the isomeric alcohol group in the isomeric alcohol phosphate is 3 to 20; "isomerism" refers to that the isomeric alcohol group in the isomeric alcohol phosphate is a branched chain.

[0098] Furthermore, C3~C 20 Alcohol phosphates include C3~C 20 Isopropyl alcohol polyoxyethylene ether phosphate.

[0099] C3~C 20 The structural formula of isomeric alcohol polyoxyethylene ether phosphate can be expressed as RO(CH2CH2O) n PO(OH)2, where R represents C3~C 20 Isomeric alcohol groups, (CH2CH2O) n represents polyoxyethylene group, n is the degree of polymerization, PO(OH)2 represents the phosphate group; the polyoxyethylene group is a chain structure composed of ethoxy (CH2CH2O) repeating units, and the degree of polymerization of the polyoxyethylene group can be changed according to demand, generally between 10-100.

[0100] Further, isomeric alcohol phosphates include C 10 ~C 13 Isopropyl alcohol polyoxyethylene ether phosphate.

[0101] Furthermore, C 10 ~C 13 The isomeric alcohol polyoxyethylene ether phosphates include isomeric decanol polyoxyethylene ether phosphates, isomeric undecanol polyoxyethylene ether phosphates, isomeric dodecanol polyoxyethylene ether phosphates, and isomeric tridecanol polyoxyethylene ether phosphates.

[0102] In some of the examples, in the polishing liquid, the isomeric alcohol phosphate ester includes at least one of isomeric tridecanol polyoxyethylene ether phosphate ester E1310P and isomeric tridecanol polyoxyethylene ether phosphate ester E1306P.

[0103] In some of the examples, in the polishing liquid, the anionic surfactant includes an alkyl polyoxyethylene ether phosphate salt; optionally, the alkyl polyoxyethylene ether phosphate salt includes at least one of an alkyl polyoxyethylene ether phosphate ammonium salt and an alkyl polyoxyethylene ether phosphate sodium salt; optionally, the number of carbon atoms of the alkyl group in the alkyl polyoxyethylene ether phosphate salt is 10 to 14.

[0104] It can be understood that the above-mentioned specific type of corrosion inhibitor, which has no corrosive chloride ions and is a fully soluble corrosion inhibitor, can effectively reduce the appearance of pinhole corrosion pits and effectively improve the polishing brightness when working with other components. If only the second phosphate ester without isomeric alcohol groups is used as a corrosion inhibitor, oil-water stratification will occur.

[0105] In some of the examples, in the polishing liquid, the mass ratio of at least one of phosphate ester, silicone ketone, cyclopentyl oleic acid and polyoxyethylene oleate to the anionic surfactant is 1:1.5~8.

[0106] It can be understood that when at least one of phosphate ester, silicone ketone, cyclopropyl oleic acid and polyoxyethylene oleate contains two or more of them at the same time, it refers to the mass ratio of the total mass of the two or more to the anionic surfactant; further, the mass ratio of at least one of phosphate ester, silicone ketone, cyclopropyl oleic acid and polyoxyethylene oleate to the anionic surfactant includes but is not limited to 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8.

[0107] In some of these examples, in the polishing solution, the rust inhibitor includes a borate ester.

[0108] Further, the borate ester includes at least one of triethanolamine borate and isomeric borate esters.

[0109] Further, isomeric borate esters include C 10 ~C 13 Isomeric borate esters. Further, the isomeric borate esters include isomeric borate ester DX1662.

[0110] Using isomeric borate as the rust inhibitor of the polishing liquid will form a complete rust-proof film on the newly polished surface, which can effectively reduce the electrochemical corrosion of Zn-Mg and Cu caused by the potential difference, and effectively reduce the oxidation corrosion phenomenon such as blue / yellow, gray-white, etc. formed by oxidation corrosion at the liquid accumulation position after polishing (strip-shaped flow marks, circular shapes or circle-shaped shapes, etc.). At the same time, it makes the polishing residues very easy to rinse, without the need to use a combination of multiple cleaning agents, and no special cleaning equipment with more than 10 slots is required, which can effectively reduce the cleaning cost and effectively improve the cleaning efficiency.

[0111] In some of these examples, in the polishing solution, the solvent includes water.

[0112] Optionally, the solvent is pure water. Further, the resistivity of pure water is ≥16 MΩ.

[0113] In some of the examples, the mass ratio of lubricant to corrosion inhibitor in the polishing liquid is 1:0.1~2.5.

[0114] It will be appreciated that the mass ratio of lubricant to corrosion inhibitor includes but is not limited to 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.1, 1:2.2, 1:2.3, 1:2.4, 1:2.5.

[0115] In some of the examples, the mass ratio of lubricant to rust inhibitor in the polishing liquid is 1:0.5~2.5.

[0116] It will be appreciated that the mass ratio of lubricant to rust inhibitor includes but is not limited to 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.1, 1:2.2, 1:2.3, 1:2.4, 1:2.5.

[0117] In some of the examples, the polishing liquid includes, by mass percentage, 3% to 10% lubricant, 1% to 8% corrosion inhibitor, 5% to 8% rust inhibitor and 74% to 91% solvent.

[0118] It can be understood that in the polishing liquid, by mass percentage, lubricants include but are not limited to 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 6%, 7%, 8%, 9%, and 10%; corrosion inhibitors include but are not limited to 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 4%, 4.2%, 4.5%, 4.8%, 5%, 6%, 7%, and 8%; rust inhibitors include but are not limited to 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, and 8%; solvents include but are not limited to 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, and 91%.

[0119] In some of the examples, the polishing liquid includes, by mass percentage, 3% to 5% lubricant, 1% to 3% corrosion inhibitor, 5% to 8% rust inhibitor and 84% to 91% solvent; the lubricant includes oleic acid diethanolamine molybdic acid and oleic acid diethanolamine thiophosphate, the corrosion inhibitor includes alcohol phosphate ester, and the rust inhibitor includes isomeric borates.

[0120] In some of the examples, the polishing liquid includes, by mass percentage, 1%~2% inorganic molybdenum salt, 5%~8% coconut oil diethanolamide, 1%~3% phosphate ester, 3%-5% alkyl polyoxyethylene ether phosphate ester salt, 5%~8% triethanolamine borate and the remainder solvent.

[0121] The polishing liquid provided in this application is a light yellow transparent liquid, which is a pure water-based liquid with a pH value of 8.5, a surface tension of 31 N / M, and a density of 1.01 g / cm 3 , stored at 3℃~15℃ for 30 days without solidification / stratification phenomenon.

[0122] An embodiment of the present application provides a method for preparing a polishing liquid, comprising the following steps:

[0123] The lubricant, corrosion inhibitor, rust inhibitor and solvent are mixed to prepare the polishing solution.

[0124] It can be understood that the raw material lubricant, corrosion inhibitor, rust inhibitor and solvent are provided according to the above-mentioned polishing liquid.

[0125] In some examples, the method for preparing the polishing liquid includes the following steps:

[0126] Step S10: mixing a lubricant and a solvent to obtain a lubricant solution;

[0127] Step S20: mixing the corrosion inhibitor with the lubricant solution obtained in step S10 to obtain a mixed solution;

[0128] Step S30: mixing the rust inhibitor with the mixed solution obtained in step S20.

[0129] In some examples, in step S10, the lubricant and part of the solvent are mixed, and the remaining solvent is added after step S30 is completed.

[0130] It is understood that stirring or the like can be used in the mixing step to promote uniform mixing.

[0131] The polishing liquid provided in the present application or the polishing liquid prepared by the preparation method of the polishing liquid provided in the present application is particularly suitable for Al-Zn-Mg-Cu sensitive aluminum alloys, and can effectively solve the problems of poor brightness and blurring when polishing Al-Zn-Mg-Cu sensitive aluminum alloys using traditional silica sol polishing liquid or alumina powder polishing liquid.

[0132] An embodiment of the present application provides a polishing method for aluminum alloy, comprising the following steps:

[0133] The aluminum alloy to be polished is mechanically polished using the polishing liquid or the polishing liquid prepared by the preparation method.

[0134] In some of the examples, in the method for polishing an aluminum alloy, the aluminum alloy includes an Al-Zn-Mg-Cu aluminum alloy.

[0135] Mechanical polishing of the aluminum alloy to be polished using the above-mentioned polishing liquid or the polishing liquid prepared by the above-mentioned preparation method can effectively prevent the lubricating film from drying out due to frictional heat during the polishing process, thereby causing poor brightness or fogging, effectively reduce the appearance of pinhole-shaped corrosion pits, effectively reduce the oxidation corrosion phenomenon at the location of the liquid accumulation after polishing, and effectively improve the polishing brightness; especially mechanical polishing of Al-Zn-Mg-Cu aluminum alloy can effectively solve the problems of poor brightness and fogging when polishing Al-Zn-Mg-Cu sensitive aluminum alloy using traditional silica sol polishing liquid or alumina powder polishing liquid.

[0136] Correspondingly, the present application also provides an aluminum alloy, which is produced by the above-mentioned aluminum alloy polishing method. The surface roughness of the aluminum alloy is low, there are no dense pinholes, the surface is overall black and bright, the luster is fine, and there is no obvious patchy opacity.

[0137] The present application is further described in detail below in conjunction with specific implementation methods, but the implementation methods of the present application are not limited thereto.

[0138] The sources of some reagents used in each embodiment and comparative example are as follows:

[0139] XP2022 water-based molybdenum extreme pressure lubricant: Luoyang Xipeng Lubrication Technology Co., Ltd.

[0140] Isotridecyl polyoxyethylene ether phosphate E1310P: Haian Petrochemical;

[0141] Isomeric borate ester DX1662: Guangzhou Dexu High-tech Materials Co., Ltd.

[0142] Example 1

[0143] The polishing liquid includes, based on 100 parts by mass: 5 parts of lubricant (XP2022 water-based molybdenum extreme pressure lubricant, including diethanolamine oleate molybdic acid and diethanolamine oleate thiophosphate in a mass ratio of 1:4), 1 part of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0144] Prepare the polishing liquid: mix the lubricant and part of the pure water to prepare a lubricant solution; mix the corrosion inhibitor with the lubricant solution to prepare a mixed solution; mix the rust inhibitor with the mixed solution, and then add the remaining pure water.

[0145] Example 2

[0146] The difference from Example 1 is that the type of lubricant is different, as follows:

[0147] The polishing liquid includes, based on 100 parts by mass: 5 parts of lubricant (including sodium molybdate and coconut oil diethanolamide in a mass ratio of 1:5), 1 part of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0148] Example 3

[0149] The difference from Example 1 is that the types of corrosion inhibitors are different, as follows:

[0150] The polishing liquid includes, based on 100 parts by mass: a lubricant (1 part of sodium molybdate, 5 parts of coconut oil diethanolamide), a corrosion inhibitor (2 parts of phosphate ester, 5 parts of alkyl polyoxyethylene ether sodium phosphate activator), 5 parts of a rust inhibitor (triethanolamine borate) and the balance pure water.

[0151] Example 4

[0152] It is basically the same as Example 1, except that the lubricant is only oleic acid diethanolamine molybdic acid, and does not include oleic acid diethanolamine thiophosphate, which is as follows:

[0153] Calculated by mass per 100 parts, the polishing liquid includes: 5 parts of lubricant (diethanolamine oleate molybdate), 1 part of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0154] Example 5

[0155] It is basically the same as Example 1, except that the mass fractions of each component are different, as follows:

[0156] The polishing liquid includes, based on 100 parts by mass: 3 parts of lubricant (XP2022 water-based molybdenum extreme pressure lubricant), 3 parts of corrosion inhibitor (isomeric tridecanol polyoxyethylene ether phosphate E1310P), 7 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0157] Example 6

[0158] The polishing liquid includes, based on 100 parts by mass, 5 parts of lubricant (oleic acid diethanolamine molybdic acid and oleic acid diethanolamine thiophosphate in a mass ratio of 1:4), 3 parts of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric boric acid ester DX1662) and the balance of pure water.

[0159] Prepare the polishing liquid: mix the lubricant and part of the pure water to prepare a lubricant solution; mix the corrosion inhibitor with the lubricant solution to prepare a mixed solution; mix the rust inhibitor with the mixed solution, and then add the remaining pure water.

[0160] Comparative Example 1

[0161] Silica / alumina polishing powder 10%, sodium polyacrylate 8%, polyvinyl alcohol 0.3%, benzotriazole 3%, liquid paraffin 5%, hydrogenated palm oil 3%, triethanolamine 3% and water as the balance.

[0162] Comparative Example 2

[0163] The method is basically the same as Example 2, except that the lubricant in Comparative Example 2 contains only molybdenum salt and no coconut oil diethanolamide is added, as follows:

[0164] The polishing liquid includes 100 parts by mass: 5 parts of lubricant (sodium molybdate), 1 part of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0165] Comparative Example 3

[0166] It is basically the same as Example 3, except that the corrosion inhibitor in Comparative Example 3 contains only phosphate ester, and no alkyl polyoxyethylene ether sodium phosphate active agent is added, specifically as follows:

[0167] The polishing liquid includes, based on 100 parts by mass: a lubricant (1 part of sodium molybdate, 5 parts of coconut oil diethanolamide), a corrosion inhibitor (2 parts of phosphate ester), 5 parts of a rust inhibitor (triethanolamine borate) and the balance pure water.

[0168] Comparative Example 4

[0169] The method is basically the same as Example 1, except that the lubricant in Comparative Example 4 is dimethyl silicone oil, specifically as follows:

[0170] The polishing liquid includes 100 parts by mass: 5 parts of lubricant (dimethyl silicone oil), 1 part of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric boric acid ester DX1662) and the balance of pure water.

[0171] Comparative Example 5

[0172] It is basically the same as Example 1, except that the lubricant in Comparative Example 5 is PEG400, specifically as follows:

[0173] The polishing liquid includes 100 parts by mass: 5 parts of lubricant (PEG400), 1 part of corrosion inhibitor (isomeric tridecanol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0174] Comparative Example 6

[0175] It is basically the same as Example 1, except that the lubricant in Comparative Example 6 is glycerol polyether G300, specifically as follows:

[0176] The polishing liquid includes 100 parts by mass: 5 parts of lubricant (glycerol polyether G300), 1 part of corrosion inhibitor (isomeric tridecyl alcohol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0177] Comparative Example 7

[0178] It is basically the same as Example 1, except that the lubricant in Comparative Example 7 is Acusol460, specifically as follows:

[0179] The polishing liquid includes 100 parts by mass: 5 parts of lubricant (Acusol460), 1 part of corrosion inhibitor (isomeric tridecanol polyoxyethylene ether phosphate E1310P), 5 parts of rust inhibitor (isomeric borate ester DX1662) and the balance of pure water.

[0180] Comparative Example 8

[0181] It is basically the same as Example 1, except that the corrosion inhibitor in Comparative Example 8 is benzotriazole, specifically as follows:

[0182] The polishing liquid includes, based on 100 parts by mass: 5 parts of lubricant (XP2022 water-based molybdenum extreme pressure lubricant), 1 part of corrosion inhibitor (benzotriazole), 5 parts of rust inhibitor (isoboric acid ester DX1662) and the balance of pure water.

[0183] The polishing liquid prepared in each embodiment and comparative example was used to polish an Al-Zn-Mg-Cu aluminum alloy with a roughness Ra of 300-500 nm.

[0184] Polishing method is as follows:

[0185] 1. Single-sided polishing;

[0186] 2. Polishing head: damping cloth polishing pad;

[0187] 3. Polishing fluid temperature: room temperature;

[0188] 4. Speed: 1600 rpm;

[0189] 5. Pressure: 3 kg;

[0190] 6. Polishing liquid flow rate: 5L / min;

[0191] 7. Polishing time: 3 minutes.

[0192] The conditions after polishing are shown in Table 1-1 and Table 1-2.

[0193] Table 1-1

[0194]

[0195] Table 1-2

[0196]

[0197] Among them, the surface after polishing by the polishing solution prepared in Example 1 is shown in Figure 1 ,from Figure 1 It can be seen that the surface residue after polishing is sparse, with only a small amount of scattered powder. The scattered powder is very easy to clean. Figure 2 There are no dense pinholes when the white light flashlight is illuminated, the surface is overall black and bright, the luster is fine, and there is no obvious spotty fog; while the surface of the comparative example 1 after polishing with the traditional polishing liquid is Figure 3~Figure 4 ,from Figure 3~Figure 4 It can be seen that there are more residues on the surface after polishing, and the residues are in the form of film blocks. The polished new surface is oxidized and corroded by the accumulated droplets to form colored spots, which are not easy to clean. The surface after being dried by an air gun is Figure 5 When illuminated by a white light flashlight, there are many pinholes, and the mottled and hazy areas have no fine luster.

[0198] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0199] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solution of the present application in detail, but it cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the contents of the attached claims, and the description and drawings can be used to explain the contents of the claims.

Claims

1. A polishing liquid, characterized in that: Includes lubricants, corrosion inhibitors, rust inhibitors and solvents; Wherein, the lubricant includes at least one of the following characteristics: (1) The lubricant includes oleic acid, diethanolamine, molybdic acid; (2) The lubricant includes an organic lubricant and an inorganic lubricant, the inorganic lubricant includes an inorganic molybdenum salt, and the organic lubricant includes at least one of coconut oil diethanolamide, polyol ester and ricinoleic acid ester; The corrosion inhibitor includes one of the following characteristics: (1) Isomeric alcohol phosphates; (2) at least one of phosphate ester, silicone ketone, cyclopentyl oleic acid and polyoxyethylene oleate and an anionic surfactant.

2. The polishing liquid according to claim 1, characterized in that The lubricant includes oleic acid diethanolamine molybdic acid and oleic acid diethanolamine thiophosphate; optionally, the mass ratio of the oleic acid diethanolamine molybdic acid to the oleic acid diethanolamine thiophosphate is 1:3-7.

3. The polishing liquid according to claim 1, characterized in that The inorganic molybdenum salt comprises at least one of sodium molybdate, ammonium molybdate, magnesium molybdate and zinc molybdate; and / or, The mass ratio of the inorganic lubricant to the organic lubricant is 1:2.5-8.

4. The polishing liquid according to claim 1, characterized in that The isomeric alcohol phosphates include C3~C 20 Isomeric alcohol phosphate; optionally, the C3~C 20 Isomeric alcohol phosphates include C3~C 20 Isopropyl alcohol polyoxyethylene ether phosphate.

5. The polishing liquid according to claim 1, characterized in that The anionic surfactant comprises an alkyl polyoxyethylene ether phosphate salt; optionally, the alkyl polyoxyethylene ether phosphate salt comprises at least one of an alkyl polyoxyethylene ether phosphate ammonium salt and an alkyl polyoxyethylene ether phosphate sodium salt, and the carbon number of the alkyl group in the alkyl polyoxyethylene ether phosphate salt is 10 to 14; and / or, The mass ratio of at least one of the phosphate ester, silicone ketone, cyclopropyl oleic acid and polyoxyethylene oleate to the anionic surfactant is 1:1.5-8.

6. The polishing liquid according to claim 1, characterized in that The rust inhibitor includes at least one of boric acid ester, tricarboxylic acid, triethanolamine oleic acid soap and fatty acid diethanolamide; optionally, the boric acid ester includes at least one of triethanolamine boric acid ester and isomeric boric acid ester DX1662.

7. The polishing liquid according to any one of claims 1 to 6, characterized in that The mass ratio of the lubricant to the corrosion inhibitor is 1:0.1-2.5; and / or, The mass ratio of the lubricant to the rust inhibitor is 1:0.5-2.

5.

8. The polishing liquid according to any one of claims 1 to 6, characterized in that Calculated by mass percentage, the polishing liquid includes 3% to 10% of lubricant, 1% to 8% of corrosion inhibitor, 5% to 8% of rust inhibitor and 74% to 91% of solvent.

9. A method for preparing a polishing liquid according to any one of claims 1 to 8, characterized in that: The following steps are involved: The lubricant, corrosion inhibitor, rust inhibitor and solvent are mixed to prepare the polishing solution.

10. A polishing method for aluminum alloy, characterized in that: The following steps are involved: The aluminum alloy to be polished is mechanically polished using the polishing liquid as described in any one of claims 1 to 8 or the polishing liquid prepared by the preparation method as described in claim 9.

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