A method for extending the life of sandblasting agent

Abstract

The present invention provides a method for extending the life of a sandblasting agent, the method comprising the following steps: (1) immersing an aluminum alloy product in a sandblasting agent, and obtaining a sandblasting treatment liquid after a first sandblasting treatment; (2) mixing an oxidant, an acid solution, and the sandblasting treatment liquid obtained in step (1), and performing a second sandblasting treatment on the aluminum alloy product after a temperature treatment. The present invention extends the service life of the sandblasting agent by using an oxidant and an acid solution, and saves the production cost of the sandblasting agent; and when the method provided by the present invention is applied to the sandblasting treatment of aluminum alloys, the operating temperature is low, the sandblasting speed is fast, and the work efficiency is further improved; in addition, the product has a small amount of erosion after the sandblasting treatment, and the sandblasting is uniform and has high stability.

Description

Technical Field

[0001] The invention belongs to the technical field of metal surface treatment and relates to a sand blasting agent, in particular to a method for extending the service life of the sand blasting agent. Background Art

[0002] Due to design or use requirements, many aluminum products need to be sandblasted to make the surface frosted. Existing metal material sandblasting treatments are divided into physical sandblasting and chemical sandblasting. Among them, physical sandblasting has low efficiency and high cost. Sandblasting agents are a commonly used chemical in the process of metal surface treatment, which can be used to remove dirt, oxide layers, etc. on the metal surface.

[0003] However, traditional sandblasting agents are easily affected by environmental factors during use, such as high temperature and humidity changes, which causes the active ingredients to decompose quickly and have a limited service life. In addition, frequent replacement of sandblasting agents not only increases production costs, but also affects the continuity and efficiency of the production line.

[0004] CN 118685775A discloses a medium-temperature chemical sandblasting agent specifically for 304 stainless steel, and the sandblasting agent comprises the following components: an accelerator, an oxidant, a soluble chloride salt, ethylenediaminetetraacetic acid, glycerol and deionized water. The sandblasting agent provided by this patent can further optimize the roughness of the surface of stainless steel and improve the appearance quality. CN 117779037A discloses a fluorine-free sandblasting agent, and the fluorine-free sandblasting agent is composed of an inorganic acid, an inorganic salt, a surfactant and a corrosion inhibitor. The sandblasting agent provided by this patent can reduce the amount of product bite and improve the uniformity and stability of sandblasting. Although the above patents can improve the sandblasting effect, neither of them provides a method for extending the life of the sandblasting agent.

[0005] In summary, it is necessary to develop a method that can extend the service life of sand blasting agent. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a method for extending the service life of a sand blasting agent, wherein the method further enhances the oxidation resistance, stability and service life of the sand blasting agent by adding a specific strong oxidant to the sand blasting agent.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for extending the life of a sandblasting agent, the method comprising the following steps:

[0009] (1) immersing the aluminum alloy product in a sandblasting agent, and obtaining a sandblasting treatment liquid after a sandblasting treatment;

[0010] (2) mixing an oxidant, an acid solution and the sandblasting solution obtained in step (1), and subjecting the aluminum alloy product to secondary sandblasting treatment after heating.

[0011] In the present invention, the elements in the aluminum alloy product include Al, Si, Fe, Cu, Mn, Mg, Zn, etc., among which the metal elements Al and Mg will react with Fe in the sandblasting agent. 3+ Reaction (chemical equation is shown below). During the reaction, Fe is precipitated and attached to the surface of the aluminum alloy, which hinders further chemical reactions. It also generates sediments at the bottom of the sandblasting tank, causing the sandblasting agent to stick to the surface of the material, which may cause a secondary reaction between the agent and the material, resulting in uneven erosion of the material surface, which in turn shortens the service life of the sandblasting agent.

[0012] 3FeCl3+Al=3FeCl2+AlCl3 (a small amount of aluminum),

[0013] 3FeCl3+2Al=3Fe+2AlCl3 (excess aluminum),

[0014] Mg+2FeCl3=MgCl2+2FeCl2 (a small amount of magnesium),

[0015] 3Mg+2FeCl3=3MgCl2+2Fe (excess magnesium),

[0016] MgCL2+FeCL2=Fe+Mg 2+ +HCL+2H2;

[0017] The present invention can reduce Fe by adding oxidant and acid to the sandblasting treatment liquid. 2+ While increasing Fe 3+ content, enhance the oxidation resistance and stability of the sand blasting agent, and achieve the purpose of extending its service life.

[0018] As a preferred technical solution of the present invention, the ingredients of the sand blasting agent in step (1) include ferric chloride, sulfuric acid, tartaric acid and sodium chloride.

[0019] As a preferred technical solution of the present invention, the content of ferric chloride in the sand blasting agent in step (1) is 130-150 g / L, for example, it can be 130 g / L, 134 g / L, 138 g / L, 142 g / L, 146 g / L or 150 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0020] Preferably, the content of sulfuric acid in the sand blasting agent in step (1) is 100-200 g / L, for example, 100 g / L, 120 g / L, 140 g / L, 160 g / L, 180 g / L or 200 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0021] Preferably, the content of tartaric acid in the sand blasting agent in step (1) is 8 to 12 g / L, for example, 8 g / L, 9 g / L, 10 g / L, 11 g / L or 12 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0022] Preferably, the content of sodium chloride in the sand blasting agent in step (1) is 20-40 g / L, for example, 20 g / L, 24 g / L, 28 g / L, 32 g / L, 36 g / L or 40 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0023] As a preferred technical solution of the present invention, the temperature of the sandblasting treatment in step (1) is 20-25°C, for example, it can be 20°C, 21°C, 22°C, 23°C, 24°C or 25°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0024] Preferably, the Fe in the sandblasting solution in step (1) 2+ The concentration is 30 to 80 g / L, for example, 30 g / L, 40 g / L, 50 g / L, 60 g / L, 70 g / L or 80 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0025] Preferably, the Fe in the sandblasting solution in step (1) 3+ The concentration is 180-235 g / L, for example, it can be 180 g / L, 190 g / L, 200 g / L, 210 g / L, 220 g / L, 230 g / L or 235 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0026] In the present invention, the Fe 2+ The concentration is 30~80g / L, Fe 3+ The concentration is 180-235 g / L. If the Fe 2+ Low concentration will lead to a more intense reaction rate of the product in the bath, resulting in excessive corrosion on the product surface. 2+ A high concentration will result in a decrease in the amount of surface corrosion on the product and a weaker sanding effect.

[0027] As a preferred technical solution of the present invention, the oxidant in step (2) comprises any one of potassium permanganate, sodium hypochlorite, sodium chlorate or sodium persulfate, or a combination of at least two thereof. Typical but non-limiting combinations include: a combination of potassium permanganate and sodium hypochlorite, a combination of potassium permanganate and sodium chlorate, a combination of potassium permanganate and sodium persulfate, a combination of sodium hypochlorite and sodium chlorate, a combination of potassium permanganate, sodium hypochlorite and sodium chlorate, a combination of sodium hypochlorite, sodium chlorate and sodium persulfate, or a combination of potassium permanganate, sodium hypochlorite, sodium chlorate and sodium persulfate.

[0028] Preferably, the amount of oxidant added in step (2) is 5 to 15 g / L, for example, 5 g / L, 7 g / L, 9 g / L, 11 g / L, 13 g / L or 15 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0029] In the present invention, the oxidant is selected based on its chemical compatibility with the main components of the sand blasting agent and its effectiveness in improving the overall performance of the sand blasting agent.

[0030] As a preferred technical solution of the present invention, the acid solution in step (2) includes sulfuric acid.

[0031] Preferably, the concentration of sulfuric acid is 96-98.3wt%, for example, 96wt%, 96.4wt%, 96.8wt%, 97.2wt%, 97.6wt%, 98wt% or 95.3wt%, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0032] The sulfuric acid described in the present invention is a CP grade reagent.

[0033] Preferably, the amount of sulfuric acid added is 8-10 g / L, for example, 8 g / L, 8.5 g / L, 9 g / L, 9.5 g / L or 10 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0034] In the present invention, the purpose of the acid solution is to adjust the pH value of the sandblasting treatment liquid. If the amount of acid solution added is too low, the amount of surface corrosion of the product will be reduced and the sandblasting effect will be weakened; if the amount of acid solution added is too high, the acidity will be too high and the product corrosion will be excessive, thereby affecting the product yield.

[0035] It is worth noting that the addition amount of the oxidant and the acid solution of the present invention is based on the volume of the sandblasting treatment liquid. More specifically, when the volume of the sandblasting treatment liquid is 1L, the addition amount of the oxidant is 5-15g, and the addition amount of the acid solution is 8-10g.

[0036] As a preferred technical solution of the present invention, the terminal temperature of the heating treatment in step (2) is 30-32°C, for example, it can be 30°C, 30.5°C, 31°C, 31.5°C or 32°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0037] Preferably, the time for the secondary sandblasting treatment in step (2) is 1 to 2 minutes, for example, 1 minute, 1.2 minutes, 1.4 minutes, 1.6 minutes, 1.8 minutes or 2 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0038] The method provided by the invention can realize that the sand blasting agent has a better sand blasting effect at room temperature, thus solving the problems of high operating temperature and long processing time of the current sand blasting agent.

[0039] As a preferred technical solution of the present invention, the method further comprises: post-processing the aluminum alloy after the secondary sand blasting treatment.

[0040] As a preferred technical solution of the present invention, the post-treatment includes a first water wash, an alkali wash and a second water wash performed sequentially.

[0041] Preferably, the temperature of the alkali washing is 48-52°C, for example, 48°C, 49°C, 50°C, 51°C or 52°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0042] Preferably, the alkali washing time is 1 to 2 minutes, for example, 1 minute, 1.2 minutes, 1.4 minutes, 1.6 minutes, 1.8 minutes or 2 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0043] Preferably, the washing liquid used in the alkali washing comprises a sodium hydroxide solution.

[0044] Preferably, the concentration of the sodium hydroxide solution is 50-70 g / L, for example, 50 g / L, 54 g / L, 58 g / L, 62 g / L, 66 g / L or 70 g / L, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0045] In the post-treatment process of the present invention, the first water washing and the second water washing are both two water washings; the purpose of the alkali washing is to remove the sandblasting dust on the surface of the product; the purpose of the second water washing is to neutralize the alkali solution and remove the dust on the surface of the product.

[0046] It is worth noting that during the primary sand blasting process and the secondary sand blasting process described in the present invention, the inside of the sand blasting tank is accompanied by compressed air stirring to improve the sand blasting efficiency.

[0047] As a preferred technical solution of the present invention, the method for extending the life of the sand blasting agent provided by the present invention comprises the following steps:

[0048] (1) Immerse the aluminum alloy product in a sandblasting agent and perform a sandblasting treatment at 20-25°C to obtain Fe 2+ Concentration is 30~80g / L, Fe 3+ Sand blasting treatment fluid with a concentration of 180-235 g / L;

[0049] The content of ferric chloride in the sand blasting agent is 130-150 g / L, the content of sulfuric acid is 100-200 g / L, the content of tartaric acid is 8-12 g / L, and the content of sodium chloride is 20-40 g / L;

[0050] (2) mixing an oxidant, sulfuric acid and the sandblasting solution obtained in step (1), heating the mixture to 30-32° C., and then performing a secondary sandblasting treatment on the aluminum alloy product for 1-2 minutes;

[0051] The amount of the oxidant added is 5 to 15 g / L, and the amount of sulfuric acid added is 8 to 10 g / L;

[0052] (3) performing post-treatment on the aluminum alloy after the secondary sandblasting treatment; the post-treatment comprises a first water wash, an alkali wash, and a second water wash performed in sequence;

[0053] The temperature of the alkali washing is 48-52° C., the time is 1-2 min, and the washing liquid used includes a sodium hydroxide solution with a concentration of 50-70 g / L.

[0054] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] (1) The present invention prolongs the service life of the sand blasting agent by using an oxidant and an acid solution, thereby saving the production cost of the sand blasting agent;

[0057] (2) When the method provided by the present invention is applied to the sandblasting treatment of aluminum alloy, the product has a small amount of erosion, and the sandblasting is uniform and has high stability;

[0058] (3) When the method provided by the present invention is used for sandblasting of aluminum alloy, the operating temperature is low and the sandblasting speed is fast, which further improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a data analysis diagram of the corrosion amount of the product frame before and after sandblasting after sandblasting using the method provided in Example 1 of the present invention;

[0060] Figure 2 This is a data analysis chart of the corrosion amount of the middle frame of the product before and after sandblasting after sandblasting using the method provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0061] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0062] The aluminum alloy product described in the following embodiments and comparative examples includes a rectangular middle plate and an outer frame fixedly arranged on the periphery of the middle plate; the thickness of the middle plate is 0.3 mm, and the thickness of the outer frame is 6.64 mm.

[0063] Example 1

[0064] This embodiment provides a method for extending the life of a sandblasting agent, the method comprising the following steps:

[0065] (1) The aluminum alloy product is immersed in a sandblasting agent and subjected to a sandblasting treatment at 22°C to obtain Fe 2+ The concentration is 71.89g / L, Fe 3+ Sand blasting treatment fluid with a concentration of 189g / L;

[0066] The content of ferric chloride in the sand blasting agent is 140g / L, the content of sulfuric acid is 150g / L, the content of tartaric acid is 10g / L, and the content of sodium chloride is 30g / L;

[0067] (2) mixing an oxidant, sulfuric acid and the sandblasting solution obtained in step (1), heating the mixture to 31° C. and performing a secondary sandblasting treatment on the aluminum alloy product for 70 seconds;

[0068] The amount of the oxidant added is 7 g / L, and the oxidant is sodium chlorate; the amount of sulfuric acid added is 9 g / L;

[0069] (3) performing post-treatment on the aluminum alloy after the secondary sandblasting treatment; the post-treatment comprises a first water wash, an alkali wash, and a second water wash performed in sequence;

[0070] The alkali washing was carried out at a temperature of 50° C. for 1.5 min, and the washing solution used included a sodium hydroxide solution with a concentration of 60 g / L.

[0071] After sandblasting using the method provided in this embodiment, the corrosion data analysis diagram of the product frame before and after sandblasting is as follows: Figure 1 As shown in the figure, the corrosion data analysis diagram of the middle frame before and after sandblasting is as follows Figure 2 shown.

[0072] Example 2

[0073] This embodiment provides a method for extending the life of a sandblasting agent, the method comprising the following steps:

[0074] (1) The aluminum alloy product is immersed in a sandblasting agent and subjected to a sandblasting treatment at 20°C to obtain Fe 2+ Concentration is 30g / L, Fe 3+ Sand blasting treatment fluid with a concentration of 180g / L;

[0075] The content of ferric chloride in the sand blasting agent is 130 g / L, the content of sulfuric acid is 100 g / L, the content of tartaric acid is 8 g / L, and the content of sodium chloride is 20 g / L;

[0076] (2) mixing an oxidant, sulfuric acid and the sandblasting solution obtained in step (1), heating the mixture to 30° C. and performing a secondary sandblasting treatment on the aluminum alloy product for 2 minutes;

[0077] The amount of the oxidant added is 5 g / L, and the oxidant is potassium permanganate; the amount of sulfuric acid added is 8 g / L;

[0078] (3) performing post-treatment on the aluminum alloy after the secondary sandblasting treatment; the post-treatment comprises a first water wash, an alkali wash, and a second water wash performed in sequence;

[0079] The alkaline washing was carried out at a temperature of 48° C. for 1 minute, and the washing solution used included a sodium hydroxide solution with a concentration of 50 g / L.

[0080] Example 3

[0081] This embodiment provides a method for extending the life of a sandblasting agent, the method comprising the following steps:

[0082] (1) The aluminum alloy product is immersed in a sandblasting agent and subjected to a sandblasting treatment at 25°C to obtain Fe 2+ Concentration is 80g / L, Fe 3+ Sand blasting treatment fluid with a concentration of 235g / L;

[0083] The content of ferric chloride in the sand blasting agent is 150 g / L, the content of sulfuric acid is 200 g / L, the content of tartaric acid is 12 g / L, and the content of sodium chloride is 40 g / L;

[0084] (2) mixing an oxidant, sulfuric acid and the sandblasting solution obtained in step (1), heating the mixture to 32° C. and performing a secondary sandblasting treatment on the aluminum alloy product for 1 min;

[0085] The amount of the oxidant added is 15 g / L, and the oxidant includes a combination of potassium permanganate and hypochlorous acid in a mass ratio of 1:1; the amount of sulfuric acid added is 10 g / L;

[0086] (3) performing post-treatment on the aluminum alloy after the secondary sandblasting treatment; the post-treatment comprises a first water wash, an alkali wash, and a second water wash performed in sequence;

[0087] The alkaline washing was carried out at a temperature of 52° C. for 1 minute, and the washing solution used included a sodium hydroxide solution with a concentration of 70 g / L.

[0088] Example 4

[0089] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0090] In this embodiment, the oxidant described in step (2) is adjusted to sodium chlorate and sodium thiosulfate in a mass ratio of 1:1.

[0091] Example 5

[0092] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0093] In this embodiment, the oxidant described in step (2) is adjusted to potassium permanganate and sodium thiosulfate in a mass ratio of 1:1.

[0094] Example 6

[0095] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0096] In this example, the amount of the oxidant added in step (2) is adjusted to 3 g / L.

[0097] Example 7

[0098] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0099] In this example, the amount of the oxidant added in step (2) is adjusted to 20 g / L.

[0100] Example 8

[0101] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0102] In this embodiment, the sulfuric acid in step (2) is adjusted to hydrochloric acid of equal mass and concentration.

[0103] Example 9

[0104] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0105] In this example, the amount of sulfuric acid added in step (2) is adjusted to 5 g / L.

[0106] Example 10

[0107] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0108] In this example, the amount of sulfuric acid added in step (2) is adjusted to 15 g / L.

[0109] Embodiment 11

[0110] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0111] In this embodiment, Fe in the sand blasting solution of step (1) is 2+ The concentration was adjusted to 20 g / L.

[0112] Example 12

[0113] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0114] In this embodiment, Fe in the sand blasting solution of step (1) is 2+ The concentration was adjusted to 100 g / L.

[0115] Example 13

[0116] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0117] In this embodiment, the temperature of the secondary sand blasting treatment in step (2) is adjusted to 25°C.

[0118] Embodiment 14

[0119] This embodiment provides a method for extending the life of a sandblasting agent, and the method is different from that of embodiment 1 only in that:

[0120] In this embodiment, the temperature of the secondary sandblasting treatment in step (2) is adjusted to 50°C.

[0121] Comparative Example 1

[0122] This comparative example provides a method for extending the life of a sandblasting agent, which differs from Example 1 only in that:

[0123] In this comparative example, the mixing of the acid solution in step (2) was omitted.

[0124] Comparative Example 2

[0125] This comparative example provides a method for extending the life of a sandblasting agent, which differs from Example 1 only in that:

[0126] In this comparative example, step (2) and step (3) are omitted, that is, after a sand blasting treatment is performed using a sand blasting agent, no subsequent operation is performed.

[0127] The amount of bite of the aluminum alloy product obtained by the method provided in the above embodiment and comparative example was tested, and the results are shown in Table 1;

[0128] Among them, in the above-mentioned embodiments and comparative examples, the analysis of iron ion concentration before and after adding oxidant for debugging is shown in Table 1.

[0129] Table 1

[0130]

[0131]

[0132] According to Table 1, we can know the following points:

[0133] (1) Comprehensive analysis of Examples 1-3 shows that the method provided by the present invention can reduce Fe 2+ While increasing Fe content 3+ The content can extend the life of the sandblasting agent while achieving uniform erosion of the center plate and the outer frame to ensure the sandblasting effect;

[0134] (2) Comprehensive analysis of Examples 1 and 4-7 shows that the type and amount of oxidant added after the first sandblasting treatment will affect the effect of the subsequent second sandblasting treatment;

[0135] When the amount of the oxidant added is too much, it will cause Fe 3+ If the content of Fe is too high, the reaction rate of the bath liquid will be more intense, resulting in excessive product erosion; on the contrary, when the addition amount of the oxidant is too low, the bath liquid will not be able to reach Fe 2+ Reduced effect causes the surface erosion of the product to decrease, and the sanding effect becomes weaker;

[0136] (3) Comprehensive analysis of Example 1, Examples 8-10 and Comparative Example 1 shows that the supplementation of acid solution can provide an acidic environment for the sandblasting treatment solution. However, if sulfuric acid is adjusted to hydrochloric acid, hydrochloric acid fumes will be generated during the secondary sandblasting process, thereby causing environmental pollution and health hazards to workers.

[0137] When the amount of sulfuric acid added is too much, the acidity will be too high and the product will be corroded excessively; on the contrary, when the amount of sulfuric acid added is too low or even zero, the acidity of the tank liquid will be insufficient, the corrosion amount of the product surface will be insufficient, and the specified effect cannot be achieved;

[0138] Furthermore, when the amount of sulfuric acid added is 0, the iron ion concentration (Fe 2+ and Fe 3+ ) is reduced at the same time, and the sandblasting effect of the product cannot be achieved;

[0139] (4) Comprehensive analysis of Example 1 and Examples 11-12 shows that the Fe 2+ The concentration will affect the subsequent oxidation effect;

[0140] When Fe 2+ When the concentration is too high, the surface corrosion of the product will be reduced, thus weakening the sandblasting effect; on the contrary, when the Fe 2+ When the concentration is too low, the bath liquid and the product will react violently, resulting in excessive erosion;

[0141] (5) Comprehensive analysis of Example 1 and Examples 13-14 shows that the temperature of the secondary sand blasting treatment in step (2) will affect the effect of the secondary sand blasting treatment;

[0142] When the temperature of the secondary sandblasting treatment is too high, the reaction speed between the liquid medicine and the product will be accelerated, so that the product will be corroded excessively; on the contrary, when the temperature of the secondary sandblasting treatment is too low, the reaction speed between the product and the liquid medicine will be reduced, resulting in no corrosion or too little corrosion of the product;

[0143] (6) Comprehensive analysis of Example 1 and Comparative Example 2 shows that when only one sandblasting treatment is performed and no post-treatment such as alkaline washing is performed, the sandblasting ash on the product surface cannot be completely removed, the product surface color is carbon black, and the expected product effect cannot be achieved.

[0144] In summary, the present invention prolongs the service life of the sand blasting agent through the oxidant and the acid solution, and saves the production cost of the sand blasting agent; and when the method provided by the present invention is applied to the sand blasting treatment of aluminum alloy, the operating temperature is low and the sand blasting speed is fast, which further improves the work efficiency; in addition, the product after sand blasting has a small amount of bite, and the sand blasting is uniform and has high stability.

[0145] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for extending the life of a sandblasting agent, characterized in that: The method comprises the following steps: (1) immersing the aluminum alloy product in a sandblasting agent, and obtaining a sandblasting treatment liquid after a sandblasting treatment; (2) mixing an oxidant, an acid solution and the sandblasting solution obtained in step (1), and subjecting the aluminum alloy product to secondary sandblasting treatment after heating.

2. The method for extending the life of the sand blasting agent according to claim 1, characterized in that: The ingredients of the sand blasting agent in step (1) include ferric chloride, sulfuric acid, tartaric acid and sodium chloride.

3. The method for extending the life of the sand blasting agent according to claim 2, characterized in that: The content of ferric chloride in the sand blasting agent in step (1) is 130-150 g / L; Preferably, the content of sulfuric acid in the sand blasting agent in step (1) is 100-200 g / L; Preferably, the content of tartaric acid in the sand blasting agent in step (1) is 8 to 12 g / L; Preferably, the content of sodium chloride in the sand blasting agent in step (1) is 20-40 g / L.

4. The method for extending the life of the sand blasting agent according to any one of claims 1 to 3, characterized in that: The temperature of the first sandblasting treatment in step (1) is 20-25° C. Preferably, the Fe in the sandblasting solution in step (1) 2+ Concentration is 30-80 g / L; Preferably, the Fe in the sandblasting solution in step (1) 3+ The concentration is 180~235g / L.

5. The method for extending the life of the sand blasting agent according to any one of claims 1 to 4, characterized in that: The oxidant in step (2) comprises any one of potassium permanganate, sodium hypochlorite, sodium chlorate or sodium persulfate, or a combination of at least two thereof; Preferably, the amount of oxidant added in step (2) is 5 to 15 g / L.

6. The method for extending the life of the sand blasting agent according to any one of claims 1 to 5, characterized in that: The acid solution in step (2) comprises sulfuric acid; Preferably, the concentration of the sulfuric acid is 96-98.3 wt %; Preferably, the amount of sulfuric acid added is 8-10 g / L.

7. The method for extending the life of the sand blasting agent according to any one of claims 1 to 6, characterized in that: The terminal temperature of the heating treatment in step (2) is 30-32°C; Preferably, the time for the secondary sand blasting treatment in step (2) is 1 to 2 minutes.

8. The method for extending the life of the sand blasting agent according to any one of claims 1 to 7, characterized in that: The method further comprises: performing post-processing on the aluminum alloy after the secondary sand blasting treatment.

9. The method for extending the life of the sandblasting agent according to claim 8, characterized in that: The post-treatment includes a first water wash, an alkali wash, and a second water wash performed sequentially; Preferably, the temperature of the alkali washing is 48-52°C; Preferably, the alkali washing time is 1 to 2 minutes; Preferably, the washing liquid used in the alkaline washing comprises a sodium hydroxide solution; Preferably, the concentration of the sodium hydroxide solution is 50-70 g / L.

10. The method for extending the life of the sand blasting agent according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: (1) Immerse the aluminum alloy product in a sandblasting agent and perform a sandblasting treatment at 20-25°C to obtain Fe 2+ Concentration is 30~80g / L, Fe 3+ Sand blasting treatment fluid with a concentration of 180-235 g / L; The content of ferric chloride in the sand blasting agent is 130-150 g / L, the content of sulfuric acid is 100-200 g / L, the content of tartaric acid is 8-12 g / L, and the content of sodium chloride is 20-40 g / L; (2) mixing an oxidant, sulfuric acid and the sandblasting solution obtained in step (1), heating the mixture to 30-32° C., and then performing a secondary sandblasting treatment on the aluminum alloy product for 1-2 minutes; The amount of the oxidant added is 5 to 15 g / L, and the amount of sulfuric acid added is 8 to 10 g / L; (3) performing post-treatment on the aluminum alloy after the secondary sandblasting treatment; the post-treatment comprises a first water wash, an alkali wash, and a second water wash performed in sequence; The temperature of the alkali washing is 48-52° C., the time is 1-2 min, and the washing liquid used includes a sodium hydroxide solution with a concentration of 50-70 g / L.

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