Film stripping agent, preparation method and film stripping method

Abstract

The embodiment of the invention discloses a film stripping agent, a preparation method and a film stripping method. The film stripping agent can be used for removing an oxide film from titanium alloy. Wherein the film stripping agent comprises 10-50% of a sulfuric acid solution; 2-15% of an organic acid; 2-15% of a chelating agent; 1-20% of a dispersant; 2-10% of a penetrant; 0.5-8% of a corrosion inhibitor, and the balance of water.

Description

Technical Field

[0001] The invention relates to the field of film stripping technology, and in particular to a film stripping agent, a preparation method and a film stripping method. Background Art

[0002] At present, the existing methods for removing titanium alloy oxide film are divided into physical methods and chemical methods, but both have corresponding defects to a greater or lesser extent.

[0003] The physical method mainly uses mechanical polishing, laser and other technical means to remove the oxide film. Mechanical polishing generally uses equipment such as a grinder to remove the surface oxide film. Although this method can remove the surface oxide film, a new oxide film will also be generated during grinding. Laser technology uses a high-energy laser beam to vaporize the oxide film, thereby removing the surface oxide scale. For example, the laser method for removing the oxide layer on the titanium surface disclosed in publication numbers CN 107338449A and CN 112371653 A, but both have the problem of incomplete oxide film removal and the generation of new oxide film due to the high heat of the laser.

[0004] In the field of titanium alloy oxide film removal, in addition to physical methods, there are also chemical methods. The chemical method mainly removes the film by reacting chemical reagents with the oxide film. The chemical method used to remove the oxide film on the surface of titanium and its alloys mainly adopts alkali explosion and pickling processes; on the one hand, the alkali explosion process requires the workpiece to be immersed in molten alkali and then pickled, which will increase the difficulty of subsequent processing; on the other hand, the pickling process generally uses fluorine-containing compounds (for example, the publication numbers CN 113913916A and CN102260899 A both use F-containing substances to remove the oxide scale on the surface of titanium and its alloys), and F-containing substances usually increase the harm.

[0005] Therefore, how to obtain a fluorine-free chemical reagent for removing the oxide film of titanium alloy is still a problem to be solved urgently. Summary of the invention

[0006] One purpose of the embodiments of the present application is to solve at least one problem in the above background and provide corresponding beneficial effects.

[0007] Another purpose of the embodiments of the present application is to provide a film stripping agent, a preparation method and a film stripping method, which can be used to remove oxide films from titanium alloys.

[0008] The embodiments of the present application mainly achieve the above objectives through the following technical solutions.

[0009] In one aspect, the present application provides a film stripping agent, comprising:

[0010] 10-50% sulfuric acid solution;

[0011] 2-15% organic acids;

[0012] 2-15% chelating agent;

[0013] 1-20% dispersant;

[0014] 2-10% penetrant;

[0015] 0.5-8% corrosion inhibitor, and

[0016] The remaining amount of water.

[0017] In some embodiments, the content of the organic acid is 10-15%.

[0018] In some embodiments, the chelating agent is present in an amount of 3-15%, optionally 5-15%.

[0019] In some embodiments, the content of the penetrant is 2-10%, optionally 3-10%.

[0020] In some embodiments, the organic acid is selected from at least one of aminoacetic acid, glycolic acid, succinic acid, maleic acid, sulfosalicylic acid, oxalic acid, citric acid, aminosulfonic acid, malic acid, tartaric acid, acetic acid, methanesulfonic acid, tannic acid, and acetic acid.

[0021] In some embodiments, the chelating agent is selected from at least one of EDTA and its sodium salt, aminoacetic acid, iminodiacetic acid, sodium gluconate, and sodium hydroxybenzenesulfonate.

[0022] In some embodiments, the chelating agent is selected from at least one of EDTA-2Na, hydroxyethylidene diphosphonic acid, inositol hexaphosphate, tartaric acid, HEDP, HEDP-2Na, sodium gluconate, sodium tartrate, sodium hexametaphosphate, sodium pyrophosphate, sorbitol, and EDTA-4Na.

[0023] In some embodiments, the dispersant is selected from at least one of sodium polyacrylate and its derivatives, polyacrylamide, polyethylene glycol, and carboxymethyl cellulose.

[0024] In some embodiments, the dispersant is selected from at least one of sodium polyacrylate, copolymer of maleic acid and acrylic acid, polyvinyl pyrrolidone, sodium dodecyl sulfate, sodium polystyrene sulfonate, BASF 445N, polyacrylamide, polyvinyl alcohol 1788, polyethylene glycol 2000, polyvinyl alcohol 124, and polyethylene glycol 6000.

[0025] In some embodiments, the penetrant is selected from at least one of fatty alcohol polyoxyethylene ether, sodium 2-ethylhexyl sulfate, and phosphate surfactants.

[0026] In some embodiments, the permeabilizing agent is selected from at least one of sodium 2-ethylhexyl sulfate, fatty alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether phosphate, isooctyl alcohol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, sodium alkyl succinate sulfonate, sodium secondary alkyl sulfate, sodium salt of dioctyl sulfonate succinate, JFC-1, isomeric alcohol polyoxyethylene ether, and isooctyl alcohol polyoxyethylene ether.

[0027] In some embodiments, the corrosion inhibitor is selected from at least one of organophosphorus, thiourea, phosphate, nitrate, molybdate, tungstate, sodium lignin sulfonate, polyaspartic acid, benzotriazole, mercaptobenzothiazole, and hexamethylenetetraammonium.

[0028] In some embodiments, the organophosphorus is selected from at least one of aminotrimethylenephosphonic acid, polyol phosphate, and 2-hydroxyphosphorylacetic acid.

[0029] In some embodiments, the molybdate is selected from sodium molybdate.

[0030] In some embodiments, the phosphate is selected from at least one of sodium ethylenediaminetetraethylenephosphate and sodium phosphate.

[0031] In one aspect, the present invention provides a method for preparing a film stripping agent, comprising the following steps:

[0032] Add water to the reactor, then slowly add sulfuric acid into the reactor and stir until mixed evenly, then cool to room temperature;

[0033] After cooling, add the chelating agent, dispersant, penetrant and corrosion inhibitor into the reaction kettle and stir until the mixture is evenly mixed to obtain the film removing agent.

[0034] In one aspect, the present invention provides a method for removing a film, comprising the following steps:

[0035] Obtain the titanium part to be stripped;

[0036] Performing a decontamination treatment on the titanium part to be de-filmed to obtain a decontaminated titanium part;

[0037] The decontaminated titanium part is subjected to de-filming treatment by using a de-filming liquid containing a de-filming agent to obtain a de-filmed titanium part.

[0038] The beneficial effects of the embodiments of the present invention include:

[0039] The film stripping agent of the embodiment of the present application can remove the surface oxide film of titanium and its alloys without post-pickling in molten alkali, and does not contain fluorine, so it can be used as a fluorine-free film stripping agent without molten alkali pickling.

[0040] In addition, the film remover of the embodiment of the present application does not contain F substance, which can reduce or minimize the harm to the human body and is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a comparison diagram of the appearance of a titanium film-removing part before and after film-removing in a film-removing application example in an embodiment of the present application;

[0042] Figure 2 This is an appearance comparison diagram of the titanium film-demolding part before and after film-demolding of comparative application example 1 in the embodiment of the present application. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0044] The terms "first", "second", "third", etc. in the embodiments of the present application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include at least one of the features.

[0045] Furthermore, the terms "comprises", "includes", "contains" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0046] In addition to the above, it is still necessary to emphasize that the reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] <Defilming Agent>

[0048] In a first aspect, the embodiments of the present application have discovered a film stripping agent, which can be used to remove the dark surface oxide film of titanium and its alloys.

[0049] The film remover comprises the following components in percentage by weight:

[0050] 10-50% sulfuric acid solution;

[0051] 2-15% organic acids;

[0052] 2-15% chelating agent;

[0053] 1-20% dispersant;

[0054] 2-10% penetrant;

[0055] 0.5-8% corrosion inhibitor, and

[0056] The remaining amount of water.

[0057] The film stripping agent of the embodiment of the present application can remove the surface oxide film of titanium and its alloys without post-pickling in molten alkali, and does not contain fluorine, so it can be used as a fluorine-free film stripping agent without molten alkali pickling.

[0058] In addition, in the field of electronic technology, with the innovation of technology, metal composite materials are gradually used in electronic products. In recent years, titanium aluminum composite materials have become an application hotspot. On the one hand, this material can achieve weight reduction, and more importantly, it has the advantages of increasing the transmission of electronic signals, and is gradually used in 3C electronic products such as mobile phones and notebooks. However, there are some problems in the surface processing of titanium alloy parts. For example, in the field of combining titanium alloys with plastics, the surface of the titanium alloy parts must be roughened or microporous treated before the titanium alloy and plastic can be combined. There is a difficulty in this processing process: that is, the natural oxide film or anodized film on the surface of the titanium alloy will affect the use effect of the subsequent chemical treatment agent, so there is an urgent need for a film stripping agent that can quickly remove the surface oxide film. The film stripping agent of the embodiment of the present application can be used to overcome this defect.

[0059] In some embodiments, the content of the organic acid is 10-15%.

[0060] In some embodiments, the content of the chelating agent is 3-15%, optionally 5-15%.

[0061] In some embodiments, the content of the penetrant is 2-10%, optionally 3-10%.

[0062] In some embodiments, the concentration of sulfuric acid in the sulfuric acid solution is greater than or equal to 98%.

[0063] In some embodiments, the organic acid is selected from at least one of aminoacetic acid, glycolic acid, succinic acid, maleic acid, sulfosalicylic acid, oxalic acid, citric acid, aminosulfonic acid, malic acid, tartaric acid, acetic acid, methanesulfonic acid, and tannic acid.

[0064] In some embodiments, the chelating agent is selected from at least one of EDTA and its sodium salt, aminoacetic acid, iminodiacetic acid, sodium gluconate, and sodium hydroxybenzenesulfonate.

[0065] In some embodiments, the chelating agent is selected from at least one of EDTA-2Na, hydroxyethylidene diphosphonic acid, inositol hexaphosphate, tartaric acid, HEDP, HEDP-2Na, sodium gluconate, sodium tartrate, sodium hexametaphosphate, sodium pyrophosphate, sorbitol, and EDTA-4Na.

[0066] In some embodiments, the dispersant is selected from at least one of sodium polyacrylate and its derivatives, copolymers of maleic acid and acrylic acid, polyacrylamide, polyethylene glycol, and carboxymethyl cellulose.

[0067] In some embodiments, at least one of sodium polyacrylate, copolymer of maleic acid and acrylic acid, polyvinyl pyrrolidone, sodium lauryl sulfate, sodium polystyrene sulfonate, BASF 445N, polyacrylamide, polyvinyl alcohol 1788, polyethylene glycol 2000, polyvinyl alcohol 124, and polyethylene glycol 6000 is used.

[0068] In some embodiments, the penetrant is selected from at least one of fatty alcohol polyoxyethylene ether, sodium 2-ethylhexyl sulfate, and phosphate surfactants.

[0069] In some embodiments, the permeabilizing agent is selected from at least one of sodium 2-ethylhexyl sulfate, fatty alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, sodium alkyl succinate sulfonate, sodium secondary alkyl sulfate, sodium salt of dioctyl sulfonate succinate, JFC-1, isomeric alcohol polyoxyethylene ether, and isooctyl alcohol polyoxyethylene ether.

[0070] In some embodiments, the corrosion inhibitor is selected from at least one of organic phosphine, thiourea, phosphate, nitrate, molybdate, tungstate, sodium lignin sulfonate, polyaspartic acid, benzotriazole, mercaptobenzothiazole, and hexamethylenetetraammonium.

[0071] In some embodiments, the organophosphorus is selected from at least one of aminotrimethylenephosphonic acid, polyol phosphate, and 2-hydroxyphosphorylacetic acid.

[0072] In some embodiments, the molybdate is selected from sodium molybdate.

[0073] In some embodiments, the phosphate is selected from at least one of sodium ethylenediaminetetraethylenephosphate and sodium phosphate.

[0074] In some embodiments, the water is selected from pure water.

[0075] <Preparation method of film removal agent>

[0076] In a second aspect, the present invention further provides a method for preparing a film stripping agent, which can be used to prepare the film stripping agent described in the embodiment of the first aspect; the preparation method comprises the following steps:

[0077] Step S101, adding water into a reaction kettle, then slowly adding sulfuric acid into the reaction kettle and stirring until the mixture is evenly mixed, and cooling to room temperature;

[0078] Step S102: After cooling, add a chelating agent, a dispersant, a penetrant, and a corrosion inhibitor into the reaction kettle, and stir until the mixture is uniformly mixed to obtain a film-removing agent.

[0079] <Defilming method>

[0080] The present invention also provides a film stripping method, comprising the following steps S201-S203:

[0081] Step S201, taking a titanium part to be stripped; the titanium part to be stripped is selected from a titanium metal part or a titanium alloy part;

[0082] Step S202, performing a decontamination treatment on the titanium part to be stripped to remove dirt, thereby obtaining a decontaminated titanium part;

[0083] In some embodiments, step S202 specifically includes: using an alkaline cleaning agent to degrease the titanium part to be delaminated, and then heating and ultrasonicating to obtain a decontaminated titanium part.

[0084] In some embodiments, the alkaline cleaning agent includes an inorganic component, a chelating agent, a surfactant and water. Optionally, the inorganic component is selected from one or more of NaOH, KOH, sodium carbonate, sodium phosphate, and sodium silicate, the chelating agent is selected from one or more of EDTA sodium salt, potassium pyrophosphate, and HEDP sodium salt, and the surfactant is selected from one or more of fatty alcohol polyoxyethylene ether, isomeric alcohol polyoxyethylene ether, and alkylphenol polyoxyethylene ether.

[0085] In some embodiments, the alkaline cleaning agent includes sodium silicate, EDTA-2Na, fatty alcohol polyoxyethylene ether AEO-9 and water.

[0086] Step S203, performing a de-filming treatment on the decontaminated titanium part with a de-filming liquid containing a de-filming agent to obtain a de-filmed titanium part. The de-filming agent is selected from the de-filming agent described in the first embodiment or the de-filming agent prepared according to the preparation method of the second embodiment.

[0087] In some embodiments, the dirt includes one or more of dust, oil, burrs, fingerprints, and debris.

[0088] In some embodiments, the step of performing a film stripping treatment on the decontaminated titanium part using a film stripping liquid containing a film stripping agent comprises:

[0089] A stripping liquid containing a stripping agent is poured into the stripping tank, and the degreased titanium part is immersed in the stripping liquid to perform a stripping treatment.

[0090] In some embodiments, the film stripping solution includes water and a film stripping agent, and the mass fraction of the film stripping agent in the film stripping solution is 20-40%.

[0091] In some embodiments, the film stripping tank is circulated or inflated.

[0092] In some embodiments, the temperature of the film stripping treatment is 60-90°C.

[0093] In some embodiments, the time for the film stripping treatment can be appropriately selected according to the requirements of different workpieces. For example, it can be 1 to 25 minutes, and optionally, 5 to 15 minutes.

[0094] In some embodiments, the film stripping method further comprises:

[0095] Step S204, washing the titanium part after film removal with water to obtain a water-washed titanium part.

[0096] The workpiece after film stripping is washed with water to remove the residual agent on the surface.

[0097] In some embodiments, the film stripping method further comprises:

[0098] Step S205, drying the washed titanium part to obtain a dried titanium film-removed part.

[0099] Step S205 can dry the moisture on the surface of the workpiece.

[0100] <Preparation Example of Film Remover>

[0101] Example 1

[0102] The film stripping agent is prepared according to the method of the following steps S110 to S120.

[0103] Step S110, adding water into the reaction kettle, then slowly adding the sulfuric acid solution into the reaction kettle and stirring until the mixture is uniformly mixed, and cooling to room temperature;

[0104] Step S120, after cooling, add a chelating agent, a dispersant, a penetrant, and a corrosion inhibitor into the reaction kettle, and stir until the mixture is uniformly mixed, thereby obtaining a film-removing agent;

[0105] Wherein, the film remover comprises the following components in percentage by weight:

[0106] 10% sulfuric acid solution;

[0107] 10% of an organic acid, wherein the organic acid is aminosulfonic acid;

[0108] 5% chelating agent, wherein the chelating agent is EDTA-2Na;

[0109] 5% dispersant, the dispersant being sodium polyacrylate;

[0110] 3% osmotic agent, wherein the osmotic agent is 2-ethylhexyl sodium sulfate;

[0111] 2% corrosion inhibitor, wherein the corrosion inhibitor is sodium ethylenediaminetetraethylidene phosphate;

[0112] and the balance of water.

[0113] Example 2

[0114] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0115] 15% sulfuric acid solution;

[0116] 12% organic acid; the organic acid is citric acid;

[0117] 10% chelating agent; the chelating agent is hydroxyethylidene diphosphonic acid (HEDP);

[0118] 13% dispersant; the dispersant is a copolymer of maleic acid and acrylic acid (CP5);

[0119] 5% penetrant; the penetrant is fatty alcohol polyoxyethylene ether (JFC-3);

[0120] 2% corrosion inhibitor, wherein the corrosion inhibitor is 2-hydroxyphosphorylacetic acid (HPAA);

[0121] and the balance of water.

[0122] Example 3

[0123] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0124] 20% sulfuric acid solution;

[0125] 15% organic acid; the organic acid is malic acid;

[0126] 15% of a chelating agent; the chelating agent is phytic acid;

[0127] 5% dispersant; the dispersant is polyvinylpyrrolidone (PVP);

[0128] 6% penetrant; the penetrant is isooctyl alcohol polyoxyethylene ether phosphate (OEP-70);

[0129] 5% corrosion inhibitor, wherein the corrosion inhibitor is polyol phosphate ester (PAPE);

[0130] and the balance of water.

[0131] Example 4

[0132] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0133] 25% sulfuric acid solution;

[0134] 10% organic acid; the organic acid is oxalic acid;

[0135] 10% chelating agent; the chelating agent is tartaric acid;

[0136] 8% dispersant; the dispersant is sodium dodecyl sulfate (K12);

[0137] 10% penetrant; the penetrant is isooctyl alcohol polyoxyethylene ether phosphate (OEP-98);

[0138] 1% corrosion inhibitor, wherein the corrosion inhibitor is sodium molybdate;

[0139] and the balance of water.

[0140] Example 5

[0141] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0142] 28% sulfuric acid solution;

[0143] 15% organic acid; the organic acid is methanesulfonic acid;

[0144] 12% chelating agent; the chelating agent is HEDP;

[0145] 5% dispersant; the dispersant is sodium polystyrene sulfonate (PSSNa);

[0146] 10% penetrant; the penetrant is fatty alcohol polyoxyethylene ether (JFC-3);

[0147] 2% corrosion inhibitor, wherein the corrosion inhibitor is hexamethyltetramine;

[0148] and the balance of water.

[0149] Example 6

[0150] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0151] 32% sulfuric acid solution;

[0152] 5% organic acid; the organic acid is sulfosalicylic acid (SSA);

[0153] 10% chelating agent; the chelating agent is HEDP-2Na;

[0154] 5% dispersant; the dispersant is BASF 445N dispersant;

[0155] 6% penetrant; the penetrant is alkylphenol polyoxyethylene ether (OP-10);

[0156] 1% corrosion inhibitor, wherein the corrosion inhibitor is aminotrimethylene phosphoric acid (ATMP);

[0157] and the balance of water.

[0158] Example 7

[0159] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0160] 35% sulfuric acid solution;

[0161] 5% organic acid; the organic acid is maleic acid (MA);

[0162] 10% chelating agent; the chelating agent is sodium gluconate;

[0163] 3% dispersant; the dispersant is polyacrylamide;

[0164] 2% penetrant; the penetrant is sodium alkyl sulfosuccinate;

[0165] 0.5% corrosion inhibitor, wherein the corrosion inhibitor is mercaptobenzothiazole;

[0166] and the balance of water.

[0167] Example 8

[0168] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0169] 38% sulfuric acid solution;

[0170] 10% organic acid; the organic acid is succinic acid;

[0171] 10% chelating agent; the chelating agent is sodium tartrate;

[0172] 5% dispersant; the dispersant is polyvinyl alcohol 1788;

[0173] 2% penetrant; the penetrant is sodium secondary alkyl sulfate;

[0174] 0.5% corrosion inhibitor, wherein the corrosion inhibitor is benzotriazole;

[0175] and the balance of water.

[0176] Example 9

[0177] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0178] 40% sulfuric acid solution;

[0179] 2% organic acid; the organic acid is glycolic acid;

[0180] 8% chelating agent; the chelating agent is sodium hexametaphosphate;

[0181] 5% dispersant; the dispersant is polyethylene glycol 2000;

[0182] 3% penetrant; the penetrant is dioctyl sulfonate succinate sodium salt;

[0183] 0.5% corrosion inhibitor, wherein the corrosion inhibitor is polyaspartic acid;

[0184] and the balance of water.

[0185] Example 10

[0186] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0187] 43% sulfuric acid solution;

[0188] 5% organic acid; the organic acid is aminoacetic acid;

[0189] 3% chelating agent; the chelating agent is sodium pyrophosphate;

[0190] 3% dispersant; the dispersant is polyvinyl alcohol 124;

[0191] 5% penetrant; the penetrant is JFC-1;

[0192] 2% corrosion inhibitor, wherein the corrosion inhibitor is sodium phosphate;

[0193] and the balance of water.

[0194] Embodiment 11

[0195] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0196] 45% sulfuric acid solution;

[0197] 3% organic acid; the organic acid is acetic acid;

[0198] 5% chelating agent; the chelating agent is sorbitol;

[0199] 3% dispersant; the dispersant is polyethylene glycol 6000;

[0200] 2% penetrant; the penetrant is isomeric alcohol polyoxyethylene ether TO-3;

[0201] 1% corrosion inhibitor, wherein the corrosion inhibitor is thiourea;

[0202] and the balance of water.

[0203] Example 12

[0204] The method is basically the same as Example 1, except that the formula of the film stripping agent is different. Specifically, the film stripping agent includes the following components in percentage by weight:

[0205] 50% sulfuric acid solution;

[0206] 2% organic acid; the organic acid is methanesulfonic acid;

[0207] 3% chelating agent; the chelating agent is EDTA-4Na;

[0208] 1% dispersant; the dispersant is sodium carboxymethyl cellulose (CMC-Na);

[0209] 2% penetrant; the penetrant is isooctyl alcohol polyoxyethylene ether;

[0210] 1% corrosion inhibitor, wherein the corrosion inhibitor is sodium lignin sulfonate;

[0211] and the balance of water.

[0212] The formulations of Examples 1 to 12 can also be found in Table 1 below.

[0213] Table 1. Formulations of Examples 1 to 12

[0214]

[0215]

[0216] <Example of film removal application>

[0217] Film removal application example 1

[0218] The titanium part is subjected to a film stripping treatment according to the method shown in the following steps S210 to S220.

[0219] Step S210, taking a titanium part to be processed (the titanium part is a titanium alloy part), and performing a decontamination treatment on the dirt on the titanium part to be processed to obtain a decontaminated titanium part; specifically, using an alkaline cleaning agent to degrease the titanium part to be delaminated, and then heating and ultrasonicating to obtain a decontaminated titanium part;

[0220] Step S220, pouring a film stripping liquid into the film stripping tank, immersing the decontaminated titanium part in the film stripping liquid, performing a film stripping treatment, and obtaining a film stripped titanium part; wherein the film stripping liquid comprises a film stripping agent and water, the mass fraction of the film stripping agent in the film stripping liquid is 20%, and the film stripping agent is selected from the film stripping agent of Example 1; the alkaline cleaning agent comprises 10% sodium silicate, 2% EDTA-2Na, 8% fatty alcohol polyoxyethylene ether AEO-9 and the balance water; the film stripping treatment temperature is 75°C, and the film stripping treatment time is 25 minutes;

[0221] Step S230, washing the titanium part after film removal with water to obtain a water-washed titanium part;

[0222] Step S240, drying the washed titanium part to obtain a dried titanium film-delayered part.

[0223] Film removal application example 2

[0224] The method is basically the same as Application Example 1, except that the film stripping treatment time is 23 minutes, and the film stripping agent is selected from the film stripping agent of Example 2.

[0225] Film removal application example 3

[0226] The method is basically the same as Application Example 1, except that the film stripping treatment time is 22 minutes, and the film stripping agent is selected from the film stripping agent of Example 3.

[0227] Film removal application example 4

[0228] The method is basically the same as Application Example 1, except that the film stripping treatment time is 20 minutes, and the film stripping agent is selected from the film stripping agent of Example 4.

[0229] Film removal application example 5

[0230] Basically the same as Application Example 1, except that the film stripping treatment time is 18 minutes, and the film stripping agent is selected from the film stripping agent of Example 5.

[0231] Film removal application example 6

[0232] The method is basically the same as Application Example 1, except that the film stripping treatment time is 16 minutes, and the film stripping agent is selected from the film stripping agent of Example 6.

[0233] Film removal application example 7

[0234] Basically the same as Application Example 1, except that the film stripping treatment time is 13 minutes, and the film stripping agent is selected from the film stripping agent of Example 7.

[0235] Film removal application example 8

[0236] The method is basically the same as Application Example 1, except that the film stripping treatment time is 10 minutes, and the film stripping agent is selected from the film stripping agent of Example 8.

[0237] Film removal application example 9

[0238] The method is basically the same as Application Example 1, except that the film stripping treatment time is 7 minutes, and the film stripping agent is selected from the film stripping agent of Example 9.

[0239] Film removal application example 10

[0240] The method is basically the same as Application Example 1, except that the film stripping treatment time is 5 minutes, and the film stripping agent is selected from the film stripping agent of Example 10.

[0241] Film removal application example 11

[0242] Basically the same as Application Example 1, except that the film stripping treatment time is 3 minutes, and the film stripping agent is selected from the film stripping agent of Example 11.

[0243] Film removal application example 12

[0244] Basically the same as Application Example 1, except that the film stripping treatment time is 1 minute, and the film stripping agent is selected from the film stripping agent of Example 12.

[0245] Comparative application example 1

[0246] The method is basically the same as Application Example 1, except that the film stripping conditions and the selected film stripping agent are inconsistent. The formula of the film stripping agent includes the following components by mass fraction: 10% sodium fluoride, 3% citric acid, 5% tartaric acid, 5% PEG-400, and the balance water; the film stripping treatment temperature is 75°C, and the film stripping treatment time is 30 minutes.

[0247] <Experimental example>

[0248] The dried titanium film-delayered parts obtained after the treatment in the film-delayered application examples 1 to 12 and the comparative application example 1 were taken as the test pieces, the appearance of the titanium film-delayered parts was observed, the film-delayered conditions were analyzed, and the results were recorded.

[0249] The appearance of the titanium film-demolding parts of film-demolding application example 10 and comparative application example 1 before and after film-demolding (film-demolding) was photographed and recorded.

[0250] Experimental results and analysis

[0251] The experimental results are shown in Table 2 and Figures 1-2 . Figure 1 This is a comparison of the appearance of the titanium film-demolding part before and after film-demolding in film-demolding application example 10. Figure 2 This is a comparison of the appearance of the titanium film-demolding part of comparative application example 1 before and after film stripping.

[0252] Table 2

[0253]

[0254]

[0255] From the above results, we can see that:

[0256] The titanium film-removing parts dried in film-removing application examples 1 to 12 are generally white in appearance, indicating that the yellow titanium alloy oxide film has been removed. However, the titanium film-removing parts dried in comparative application example 1 are still generally yellow in appearance, indicating that the titanium alloy oxide film is difficult to remove.

[0257] The above specific embodiments have been described in detail for the present invention, but these do not constitute limitations on the present invention. The protection scope of the present invention is not limited to the above embodiments, and any equivalent modifications or changes made by ordinary technicians in the field based on the content disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A film stripping agent, characterized in that: include: 10-50% sulfuric acid solution; 2-15% organic acids; 2-15% chelating agent; 1-20% dispersant; 2-10% penetrant; 0.5-8% corrosion inhibitor, and The remaining amount of water.

2. The film stripping agent according to claim 1, characterized in that The organic acid is selected from at least one of aminoacetic acid, glycolic acid, succinic acid, maleic acid, sulfosalicylic acid, oxalic acid, citric acid, aminosulfonic acid, malic acid, tartaric acid, acetic acid, methanesulfonic acid and tannic acid.

3. The film stripping agent according to claim 1, characterized in that: The chelating agent is selected from at least one of EDTA and its sodium salt, aminoacetic acid, iminodiacetic acid, sodium gluconate and sodium hydroxybenzenesulfonate.

4. The film remover according to claim 1, characterized in that: The dispersant is selected from at least one of sodium polyacrylate and its derivatives, polyacrylamide, polyethylene glycol and carboxymethyl cellulose.

5. The film remover according to claim 1, characterized in that: The penetrant is selected from at least one of fatty alcohol polyoxyethylene ether, 2-ethylhexyl sodium sulfate, and phosphate esters.

6. The film stripping agent according to claim 1, characterized in that: The corrosion inhibitor is selected from at least one of organic phosphites, thiourea, phosphates, nitrates, molybdates, and tungstates.

7. The film remover according to claim 1, characterized in that: The chelating agent is selected from at least one of EDTA-2Na, hydroxyethylidene diphosphonic acid, inositol hexaphosphate, tartaric acid, HEDP, HEDP-2Na, sodium gluconate, sodium tartrate, sodium hexametaphosphate, sodium pyrophosphate, sorbitol, and EDTA-4Na; The dispersant is selected from at least one of sodium polyacrylate, copolymer of maleic acid and acrylic acid, polyvinyl pyrrolidone, sodium lauryl sulfate, sodium polystyrene sulfonate, BASF 445N, polyacrylamide, polyvinyl alcohol 1788, polyethylene glycol 2000, polyvinyl alcohol 124, and polyethylene glycol 6000; The penetrant is selected from at least one of sodium 2-ethylhexyl sulfate, fatty alcohol polyoxyethylene ether, isooctyl alcohol polyoxyethylene ether phosphate, isooctyl alcohol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, sodium alkyl sulfosuccinate, sodium secondary alkyl sulfate, sodium salt of dioctyl sulfosuccinate, JFC-1, isomeric alcohol polyoxyethylene ether, and isooctyl alcohol polyoxyethylene ether.

8. The method for preparing the film remover according to claim 1, comprising the following steps: Add water to the reactor, then slowly add the sulfuric acid solution into the reactor and stir until mixed evenly, and cool to room temperature; After cooling, add the chelating agent, dispersant, penetrant and corrosion inhibitor into the reaction kettle and stir until the mixture is evenly mixed to obtain the film removing agent.

9. A film stripping method, characterized in that: The following steps are involved: Obtain the titanium part to be stripped; Performing a decontamination treatment on the titanium part to be de-filmed to obtain a decontaminated titanium part; The decontaminated titanium part is subjected to de-filming treatment using a de-filming liquid containing a de-filming agent to obtain a de-filmed titanium part; wherein the de-filming agent is selected from any one of claims 1 to 7.

10. The film stripping method according to claim 9, characterized in that: The film stripping solution containing the film stripping agent also includes water; in the film stripping solution containing the film stripping agent, the mass fraction of the film stripping agent is 20-40%.

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