High-salt-fog-resistance aluminum product passivator and preparation method thereof

A passivation agent and salt spray resistance technology, applied in the direction of metal material coating process, etc., can solve the problems of polluting the environment, poor passivation effect, endangering human health, etc. Energy saving effect

Inactive Publication Date: 2014-11-19
况金权 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is an extremely toxic and carcinogenic heavy metal ion, which seriously pollutes the environment and endangers human health. At present, some small workshops in my country still use hexavalent chromium passivation process through improper channels
The chromium-free passivation process mainly replaces trivalent chromium ions with zirconium salt or titanium salt, and adds corresponding film-forming aids, oxidants, etc., and the performance of the formed passivation film is close to that of the trivalent chromium passivation process. Pollution is very small, and has good social application value, but the passivation effect is slightly poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 11

[0134] The composition of aluminum material passivator is:

[0135] Chromium sulfate 15 g / L;

[0136] Sodium hydroxide 1 g / L;

[0137] Potassium fluozirconate 15 g / L;

[0138] Sodium fluoride 1 g / L;

[0139] Sodium nitrate 1 g / L;

[0140] Nickel nitrate 0.8 g / L;

[0141] The balance is water.

[0142] First mix potassium fluozirconate and sodium fluoride and dissolve in water, completely dissolve chromium sulfate in water at 70~75°C, then add to the former solution and stir and mix, then add sodium hydroxide and sodium nitrate to the mixed solution , Nickel nitrate, stir evenly, add water to make up volume. The use process of aluminum material passivator is the same as comparative example 1. According to the GB / T 1771-2007 standard, the neutral salt spray test of the bare aluminum film was carried out, and the results are shown in the attached table.

example 12

[0144] The composition of aluminum material passivator is:

[0145] Chromium sulfate 16 g / L;

[0146] Sodium hydroxide 1.2 g / L;

[0147] Potassium fluozirconate 18 g / L;

[0148] Ammonium fluoride 1.5 g / L;

[0149] Sodium nitrate 1 g / L;

[0150] Nickel nitrate 0.6 g / L;

[0151] The balance is water.

[0152] First mix potassium fluozirconate and ammonium fluoride and dissolve in water, completely dissolve chromium sulfate in water at 70~75°C, then add to the former solution and stir and mix, then add sodium hydroxide and sodium nitrate to the mixed solution , Nickel nitrate, stir evenly, add water to make up volume. The use process of aluminum material passivator is the same as comparative example 1. According to the GB / T 1771-2007 standard, the neutral salt spray test of the bare aluminum film was carried out, and the results are shown in the attached table.

example 13

[0154] The composition of aluminum material passivator is:

[0155] Chromium sulfate 13 g / L;

[0156] Sodium hydroxide 1.3 g / L;

[0157] Potassium fluozirconate 13 g / L;

[0158] Potassium fluoride 1.5 g / L;

[0159] Potassium nitrate 0.6 g / L;

[0160] Nickel sulfate 0.9 g / L;

[0161] The balance is water.

[0162] Mix and dissolve potassium fluozirconate and potassium fluoride in water first, completely dissolve chromium sulfate in water at 70~75°C, then add to the former solution and stir and mix, then add sodium hydroxide and potassium nitrate to the mixed solution , Nickel sulfate, stir well and then add water to make up to volume. The use process of aluminum material passivator is the same as comparative example 1. According to the GB / T 1771-2007 standard, the neutral salt spray test of the bare aluminum film was carried out, and the results are shown in the attached table.

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Abstract

The invention relates to a high-salt-fog-resistance aluminum product passivator which is an environment-friendly passivator having excellent adhesive force and high corrosion resistance, remarkably prolonging the corrosion resistance time and containing no phosphate, nitrite or other toxic heavy metal ions. The aluminum product passivator mainly comprises the following components: fluozirconate, chromic sulfate, sodium hydroxide, fluoride salt, nitrate, nickel salt and water. A preparation method of the aluminum product passivator comprises the following steps: mixing the fluozirconate and the fluoride salt, dissolving in water; fully dissolving the chromic sulfate in water of 70-75 DEG C, then adding into the former solution, and evenly mixing; and then, sequentially adding the sodium hydroxide, the nitrate and the nickel salt into the mixed solution, evenly stirring, and adding water to a specified volume, thus obtaining the aluminum product passivator. The method is simple to operate and short in processing time; and the aluminum product passivator can be repeatedly used. Thus, the cost can be saved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a passivator for aluminum material surface pretreatment and its preparation method and application. Background technique [0002] Aluminum is a soft, lively and light metal with a silver-white metallic luster. Aluminum powder is often used as silver paint to protect the surface of iron products from corrosion and to be beautiful. Aluminum has very good thermal conductivity and can be used to manufacture various heat exchanges in industry. It can also be used for household cooking utensils, etc.; aluminum also has good ductility, and can be made into very thin aluminum foil at 100~150 °C, of ​​course, it can also be made into various aluminum wires, aluminum strips, etc. products. In addition, thermite is often used in transportation to weld rails, steel bars and other large cross-section workpieces. At present, the most widely used aluminum material is mainly al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34
Inventor 况金权
Owner 况金权
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