CN108103487A - A kind of zinc-plated silicate passivation solution and preparation method thereof - Google Patents
A kind of zinc-plated silicate passivation solution and preparation method thereof Download PDFInfo
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- 238000002161 passivation Methods 0.000 title claims abstract description 44
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 32
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 27
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012153 distilled water Substances 0.000 claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- SEBZSCZCDFOSIE-UHFFFAOYSA-N cerium(3+) trinitrate pentahydrate Chemical compound O.O.O.O.O.[Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SEBZSCZCDFOSIE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 11
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 231100000086 high toxicity Toxicity 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 231100000614 poison Toxicity 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000003440 toxic substance Substances 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 239000004115 Sodium Silicate Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 9
- 229910052911 sodium silicate Inorganic materials 0.000 description 9
- 239000007921 spray Substances 0.000 description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 235000019795 sodium metasilicate Nutrition 0.000 description 2
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 1
- 150000000703 Cerium Chemical class 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- ODPUKHWKHYKMRK-UHFFFAOYSA-N cerium;nitric acid Chemical compound [Ce].O[N+]([O-])=O ODPUKHWKHYKMRK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000004690 nonahydrates Chemical class 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/10—Orthophosphates containing oxidants
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
本发明提供一种镀锌硅酸盐钝化液及其制备方法，涉及镀锌表面处理技术领域，所述的钝化液组分包括以下原料：九水偏硅酸钠40‑50g/L，95％‑98％浓硫酸3‑5mL/L，30％双氧水6‑15mL/L，65％‑68％浓硝酸2‑5mL/L，五水硝酸铈4‑10g/L，其余为蒸馏水，溶液总体积为1L，钝化体系的pH值为1‑2。本发明制备工艺简单。钝化液成膜光泽度好，表面均匀，具有很好的耐腐蚀性能。本发明在钝化液中所用成分为无机物，不含任何价态铬及有毒物质，克服了铬酸盐钝化技术毒性大、对环境产生破坏等缺点；本发明组分便宜，利于生产及推广。The invention provides a galvanized silicate passivation solution and a preparation method thereof, and relates to the technical field of galvanized surface treatment. The passivation solution components include the following raw materials: sodium metasilicate nonahydrate 40-50g/L, 95%-98% concentrated sulfuric acid 3-5mL/L, 30% hydrogen peroxide 6-15mL/L, 65%-68% concentrated nitric acid 2-5mL/L, cerium nitrate pentahydrate 4-10g/L, the rest is distilled water, solution The total volume is 1L and the pH of the passivation system is 1‑2. The preparation process of the invention is simple. The passivation solution film has good gloss, uniform surface and good corrosion resistance. The components used in the passivation solution of the present invention are inorganic substances, do not contain any valence chromium and toxic substances, and overcome the shortcomings of the chromate passivation technology, such as high toxicity and damage to the environment; the components of the present invention are cheap, and are conducive to production and maintenance promote.
Description
技术领域technical field
本发明涉及一种材料表面防腐处理技术领域，具体涉及一种镀锌硅酸盐钝化液及其制备方法。The invention relates to the technical field of material surface anticorrosion treatment, in particular to a galvanized silicate passivation solution and a preparation method thereof.
背景技术Background technique
镀锌能有效的提高钢板的耐腐蚀性能，在建材领域中被广泛应用，但在潮湿环境中镀锌层容易发生腐蚀形成暗灰色或者白色腐蚀产物，导致防腐性能下降。为此必须进行钝化处理。目前市场上所用的铬酸钝化剂，效果好，但污染较大，随着人们环保意识的增强，无铬钝化将逐渐占据整个市场，而硅酸盐钝化具有较强的竞争力。Galvanizing can effectively improve the corrosion resistance of steel plates and is widely used in the field of building materials. However, in a humid environment, the galvanized layer is prone to corrosion and forms dark gray or white corrosion products, resulting in a decrease in corrosion resistance. Passivation is necessary for this. At present, the chromic acid passivation agent used in the market is effective, but the pollution is relatively large. With the enhancement of people's environmental awareness, chromium-free passivation will gradually occupy the entire market, while silicate passivation has strong competitiveness.
发明内容Contents of the invention
针对现有技术的不足，本发明提供了一种镀锌硅酸盐钝化液及其制备方法，成本低廉，对环境无污染，同时具有良好的耐腐蚀性。Aiming at the deficiencies of the prior art, the invention provides a galvanized silicate passivation solution and a preparation method thereof, which have low cost, no pollution to the environment and good corrosion resistance.
为实现以上目的，本发明通过以下技术方案予以实现：To achieve the above object, the present invention is achieved through the following technical solutions:
一种镀锌硅酸盐钝化液，用于镀锌层零部件的钝化处理，由以下原料组成：九水偏硅酸钠40‐50g/L、95％‐98％浓硫酸3‐5mL/L、30％双氧水6‐15mL/L、65％‐68％浓硝酸2‐5mL/L、五水硝酸铈4‐10g/L、其余为蒸馏水，溶液总体积为1L，钝化体系的pH值为1‐2。A galvanized silicate passivation solution for the passivation treatment of galvanized parts, consisting of the following raw materials: sodium metasilicate nonahydrate 40‐50g/L, 95%‐98% concentrated sulfuric acid 3‐5mL /L, 30% hydrogen peroxide 6-15mL/L, 65%-68% concentrated nitric acid 2-5mL/L, cerium nitrate pentahydrate 4-10g/L, the rest is distilled water, the total volume of the solution is 1L, the pH of the passivation system The value is 1‐2.
其中，九水偏硅酸钠为粉末状。Among them, sodium metasilicate nonahydrate is in powder form.
优选的，镀锌硅酸盐钝化液，由以下原料组成：九水偏硅酸钠45g/L，95％‐98％浓硫酸5mL/L，30％双氧水10mL/L，65％‐68％浓硝酸2mL/L，五水硝酸铈8g/L，其余为蒸馏水，溶液总体积为1L，钝化液的pH＝1.4。Preferably, the galvanized silicate passivation solution consists of the following raw materials: sodium metasilicate nonahydrate 45g/L, 95%-98% concentrated sulfuric acid 5mL/L, 30% hydrogen peroxide 10mL/L, 65%-68% Concentrated nitric acid is 2mL/L, cerium nitrate pentahydrate is 8g/L, and the rest is distilled water. The total volume of the solution is 1L, and the pH of the passivation solution is 1.4.
一种镀锌硅酸盐钝化液的制备方法，包括以下步骤：A preparation method for galvanized silicate passivation solution, comprising the following steps:
(1)室温下，将九水偏硅酸钠用高速万能粉碎机,20000‐25000转/分，粉碎3‐6分钟，打成粉末，取粉碎后的硅酸钠粉末，溶于蒸馏水中，并使其充分溶解；(1) At room temperature, use a high-speed universal pulverizer to grind sodium metasilicate nonahydrate at 20,000-25,000 rpm for 3-6 minutes and grind it into powder. Take the pulverized sodium silicate powder and dissolve it in distilled water. and make it fully dissolved;
(2)依次向步骤(1)中加入浓硫酸，双氧水，和浓硝酸，搅拌均匀；(2) Add concentrated sulfuric acid, hydrogen peroxide, and concentrated nitric acid to step (1) successively, stir;
(3)将65％‐68％浓硝酸配制成3％‐5％的硝酸溶液，用于调节溶液的pH值至1‐2；(3) Prepare 65%-68% concentrated nitric acid into 3%-5% nitric acid solution to adjust the pH value of the solution to 1-2;
(4)将五水硝酸铈加入步骤(3)中搅拌并充分溶解，制得硅酸盐钝化液。(4) adding cerium nitrate pentahydrate into the step (3) and stirring and fully dissolving to obtain a silicate passivation solution.
本发明与现有技术相比，具有以下优点：(1)本发明耐蚀性能优良，经中性盐雾腐蚀试验比较，目前商业应用的较好铬酸盐钝化后24h出现腐蚀斑点，而经本发明所制备的钝化液处理后出现白锈的时间延长至94h；(2)本发明采用的九水偏硅酸钠作为主要成分，同时将九水偏硅酸钠用高速万能粉碎机粉碎，能够显著提高九水偏硅酸盐的溶解性，进而提高成膜效率，使得表面均匀；(3)本发明在钝化液中所用成分为无机物，不含任何价态铬及有毒物质，克服了铬酸盐钝化技术毒性大、对环境产生破坏等缺点；(4)铈盐是一种变价金属，能够储存和释放电子，形成不同的氧化物，通常用于碱性条件下，本发明以硝酸铈为掺杂盐，作为钝化液的组分改进剂，在酸性体系中发挥了重要作用。(5)本发明组分便宜，利于生产及推广。Compared with the prior art, the present invention has the following advantages: (1) the corrosion resistance of the present invention is excellent, and compared through the neutral salt spray corrosion test, corrosion spots appear in 24h after the better chromate passivation of commercial application at present, and The time that white rust occurs after the passivation solution prepared by the present invention is processed extends to 94h; Pulverization can significantly improve the solubility of nonahydrate metasilicate, and then improve the film-forming efficiency, so that the surface is uniform; (3) the components used in the passivation solution of the present invention are inorganic substances, and do not contain any valence chromium and toxic substances , to overcome the disadvantages of chromate passivation technology, such as high toxicity and damage to the environment; (4) cerium salt is a variable-valence metal that can store and release electrons to form different oxides, and is usually used under alkaline conditions. In the present invention, cerium nitrate is used as a doping salt, and as a component improver of passivation solution, it plays an important role in an acidic system. (5) The components of the present invention are cheap, which is beneficial to production and popularization.
具体实施方式Detailed ways
下面结合实施例对本发明的实质作进一步说明。Below in conjunction with embodiment the essence of the present invention will be further described.
实施例1：Example 1:
镀锌硅酸盐钝化液，由以下原料组成：九水偏硅酸钠50.0g/L，所述的九水偏硅酸钠为粉末状，95％‐98％浓硫酸5.0mL/L，30％双氧水6.0mL/L，65％‐68％浓硝酸2.0mL/L，硝酸铈10.0g/L，其余为蒸馏水，溶液总体积为1L，钝化体系的pH值为1.0。The galvanized silicate passivation solution is composed of the following raw materials: sodium metasilicate nonahydrate 50.0g/L, described sodium metasilicate nonahydrate is powdery, 95%-98% concentrated sulfuric acid 5.0mL/L, 30% hydrogen peroxide 6.0mL/L, 65%-68% concentrated nitric acid 2.0mL/L, cerium nitrate 10.0g/L, the rest is distilled water, the total volume of the solution is 1L, and the pH value of the passivation system is 1.0.
其制备方法为：室温下，将九水偏硅酸钠用高速万能粉碎机(FW‐200D),20000转/分‐25000转/分，粉碎3分钟，打成粉末，取50g粉碎后的九水偏硅酸钠粉末，溶于1L蒸馏水中，并使其充分溶解；依次向硅酸钠溶液中加入5.0mL浓硫酸，6.0mL双氧水，2.0mL浓硝酸搅拌均匀；之后将65％‐68％浓硝酸配制成3％的硝酸溶液用于调节溶液的pH值为1.0；再加入10g五水硝酸铈搅拌并充分溶解，制得硅酸盐钝化液。The preparation method is as follows: at room temperature, use a high-speed universal pulverizer (FW-200D) to crush sodium metasilicate nonahydrate at 20000 rpm-25000 rpm for 3 minutes, and grind it into powder, and take 50 g of pulverized nonaqueous sodium metasilicate. Aqueous sodium metasilicate powder, dissolved in 1L distilled water, and fully dissolved; sequentially add 5.0mL concentrated sulfuric acid, 6.0mL hydrogen peroxide, 2.0mL concentrated nitric acid to the sodium silicate solution and stir well; then mix 65%-68% Concentrated nitric acid was prepared into a 3% nitric acid solution to adjust the pH value of the solution to 1.0; then 10 g of cerium nitrate pentahydrate was added and stirred and fully dissolved to obtain a silicate passivation solution.
所述的九水偏硅酸钠为工业品，浓硫酸、双氧水、浓硝酸、五水硝酸铈均为市售化学纯产品。The sodium metasilicate nonahydrate is an industrial product, and concentrated sulfuric acid, hydrogen peroxide, concentrated nitric acid and cerium nitrate pentahydrate are commercially available chemically pure products.
将锌层厚度为20μm镀锌钢Q235，用3％的硝酸活化30s，蒸馏水冲洗1min，在35℃条件下，将活化后的镀锌片浸入钝化液中90s，室温干燥24h后，进行中性盐雾试验。Galvanized steel Q235 with a zinc layer thickness of 20 μm, activated with 3% nitric acid for 30 seconds, rinsed with distilled water for 1 minute, immersed the activated galvanized sheet in the passivation solution for 90 seconds at 35°C, dried at room temperature for 24 hours, and carried out Salt spray test.
盐雾实验结果参见表1.The results of the salt spray test are shown in Table 1.
实施例2：Example 2:
镀锌硅酸盐钝化液，由以下原料组成：九水硅酸钠40.0g/L，所述的九水偏硅酸钠为粉末状，95％‐98％浓硫酸3.0mL/L，30％双氧水10.0mL/L，65％‐68％浓硝酸5.0mL/L，五水硝酸铈4.0g/L，其余为蒸馏水，溶液总体积为1L，钝化体系的pH值为1.5。The galvanized silicate passivation solution consists of the following raw materials: sodium metasilicate nonahydrate 40.0g/L, the sodium metasilicate nonahydrate is powdery, 95%-98% concentrated sulfuric acid 3.0mL/L, 30 % hydrogen peroxide 10.0mL/L, 65%-68% concentrated nitric acid 5.0mL/L, cerium nitrate pentahydrate 4.0g/L, the rest is distilled water, the total volume of the solution is 1L, and the pH value of the passivation system is 1.5.
其制备方法为:室温下，将硅酸钠用高速万能粉碎机(FW‐200D),20000转/分，粉碎6分钟，打成粉末，取40g粉碎后的硅酸钠粉末，溶于1L蒸馏水中，并使其充分溶解；依次向硅酸钠溶液中加入3.0mL浓硫酸，10.0mL双氧水，5.0mL浓硝酸搅拌均匀；之后用3％硝酸调节溶液的pH值为1.5；再加入4.0g硝酸铈搅拌并充分溶解，制得硅酸盐钝化液。The preparation method is as follows: at room temperature, use a high-speed universal pulverizer (FW-200D) to pulverize sodium silicate for 6 minutes at 20,000 rpm, and grind it into powder. Take 40 g of pulverized sodium silicate powder and dissolve it in 1 L of distilled water Add 3.0mL of concentrated sulfuric acid, 10.0mL of hydrogen peroxide, and 5.0mL of concentrated nitric acid to the sodium silicate solution and stir evenly; then use 3% nitric acid to adjust the pH of the solution to 1.5; then add 4.0g of nitric acid Cerium was stirred and fully dissolved to obtain a silicate passivation solution.
所述的九水偏硅酸钠为工业品，浓硫酸、双氧水、浓硝酸、硝酸铈均为市售化学纯产品。The sodium metasilicate nonahydrate is an industrial product, and concentrated sulfuric acid, hydrogen peroxide, concentrated nitric acid and cerium nitrate are commercially available chemically pure products.
将锌层厚度为20μm镀锌钢Q235，用3％的硝酸活化30s，蒸馏水冲洗1min，在35℃条件下，将活化后的镀锌片浸入钝化液中90s，室温干燥24h后，进行中性盐雾试验。Galvanized steel Q235 with a zinc layer thickness of 20 μm, activated with 3% nitric acid for 30 seconds, rinsed with distilled water for 1 minute, immersed the activated galvanized sheet in the passivation solution for 90 seconds at 35°C, dried at room temperature for 24 hours, and carried out Salt spray test.
盐雾实验结果参见表1.The results of the salt spray test are shown in Table 1.
实施例3：Example 3:
镀锌硅酸盐钝化液，由以下原料组成：九水偏硅酸钠45g/L，所述的九水偏硅酸钠为粉末状，95％‐98％浓硫酸5mL/L，30％双氧水10mL/L，65％‐68％浓硝酸2mL/L，五水硝酸铈8g/L，其余为蒸馏水，溶液总体积为1L，钝化液的pH＝1.4。The galvanized silicate passivation solution is made up of the following raw materials: sodium metasilicate nonahydrate 45g/L, described sodium metasilicate nonahydrate is powdery, 95%-98% concentrated sulfuric acid 5mL/L, 30% Hydrogen peroxide 10mL/L, 65%-68% concentrated nitric acid 2mL/L, cerium nitrate pentahydrate 8g/L, the rest is distilled water, the total volume of the solution is 1L, and the pH of the passivation solution is 1.4.
其制备方法为:室温下，将九水偏硅酸钠用高速万能粉碎机(FW‐200D),25000转/分，粉碎3分钟，打成粉末，取45g粉碎后的硅酸钠粉末，溶于1L蒸馏水中，并使其充分溶解；依次向硅酸钠溶液中加入5.0mL浓硫酸，10.0mL双氧水，2.0mL浓硝酸搅拌均匀；之后用3％浓硝酸调节溶液的pH值为1.4；再加入8.0g五水硝酸铈搅拌并充分溶解，制得硅酸盐钝化液。Its preparation method is: under room temperature, sodium metasilicate nonahydrate is used high-speed universal pulverizer (FW-200D), 25000 rpm, pulverizes 3 minutes, beats into powder, takes 45g pulverized sodium silicate powder, dissolves Dissolve in 1L of distilled water; add 5.0mL of concentrated sulfuric acid, 10.0mL of hydrogen peroxide, and 2.0mL of concentrated nitric acid to the sodium silicate solution and stir evenly; then use 3% concentrated nitric acid to adjust the pH of the solution to 1.4; Add 8.0 g of cerium nitrate pentahydrate, stir and fully dissolve to prepare a silicate passivation solution.
所述的九水偏硅酸钠为工业品，浓硫酸、双氧水、浓硝酸、硝酸铈均为市售化学纯产品。The sodium metasilicate nonahydrate is an industrial product, and concentrated sulfuric acid, hydrogen peroxide, concentrated nitric acid and cerium nitrate are commercially available chemically pure products.
将锌层厚度为20μm镀锌钢Q235，用3％的硝酸活化30s，蒸馏水冲洗1min，在35℃条件下，将活化后的镀锌片浸入钝化液中90s，室温干燥24h后，进行中性盐雾试验。Galvanized steel Q235 with a zinc layer thickness of 20 μm, activated with 3% nitric acid for 30 seconds, rinsed with distilled water for 1 minute, immersed the activated galvanized sheet in the passivation solution for 90 seconds at 35°C, dried at room temperature for 24 hours, and carried out Salt spray test.
盐雾实验结果参见表1.The results of the salt spray test are shown in Table 1.
表1盐雾实验结果Table 1 Salt spray test results
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