Environment friendly no-chromium conversion treating solution

A chromium-free conversion and treatment solution technology, applied in the coating process of metal materials, etc., can solve the problems of use and emission restrictions, environmental pollution, etc., and achieve the effect of good corrosion resistance

Inactive Publication Date: 2007-06-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chromate of hexavalent chromium or chromate of trivalent chromium will cause serious environmental pollution, and its use and discharge have been increasingly restricted by national regulations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 20 grams of 20% titanous sulfate, 24 grams of sodium fluoride, 4 grams of succinic acid, 5 grams of sodium silicate, 12 grams of hydrogen peroxide, 3 grams of 65% nitric acid, 1 gram of cobalt sulfate , 2 grams of ethylene glycol, 0.5 grams of polyvinyl alcohol and the deionized water of the remainder are mixed and stirred evenly at room temperature to make 1 liter of environment-friendly chrome-free conversion treatment solution.

[0019] Add 20% sodium hydroxide solution to 1 liter of environment-friendly chromium-free conversion treatment solution prepared above, and adjust the pH value to 2.0-4.0. Then, chemical conversion treatment is carried out on the galvanized layer molded product and the zinc alloy molded product respectively to prepare a corrosion-resistant conversion film. The environment-friendly chromium-free conversion treatment liquid of the present invention can obtain conversion films of different colors by controlling the chemical conversion time duri...

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PUM

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Abstract

The environment friendly no-chromium conversion treating solution consists of titanium salt in 1-25 g/l, complexing agent in 12-30 g/l, silicate in 5-15 g/l, redox agent in 10-25 g/l, additive in 3- 6.5 g/l and deionized water for the rest. The treating solution contains no Cr element, is suitable for chemical conversion treatment of galvanizing coating and zinc alloy product, and produces no environmental pollution. When the treating solution is used in chemical conversion treatment of galvanizing coating and zinc alloy product, white film, blue film or film in other color may be obtained.

Description

technical field [0001] The present invention relates to a conversion treatment solution suitable for electroless plating, more particularly, refers to a conversion treatment solution suitable for electroless plating of galvanized layer molded products and zinc alloy molded products, which does not contain hexavalent chromium or trivalent chromium Environmentally friendly chromium-free conversion treatment fluid. Background technique [0002] Galvanizing (Zn) is an effective method to improve the resistance of steel materials to atmospheric corrosion. However, in a humid environment, the galvanized layer on the surface of the steel material is prone to corrosion, and white loose corrosion products (white rust) are easily formed on the surface, and the galvanized layer treated with chemical conversion can prolong the time of white rust . [0003] The widely used chemical conversion treatment solution for galvanized layer is chromate of hexavalent chromium or chromate of triv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/06C23C22/34
Inventor 朱立群杨飞刘慧丛李卫平
Owner BEIHANG UNIV
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