Non-chrome white passivator
A passivation agent, blue-white technology, applied in the direction of metal material coating process, etc., can solve the problems of biological and environmental hazards, toxicity, carcinogenicity, etc.
Inactive Publication Date: 2015-02-25
SHANDONG JIANZHU UNIV
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Problems solved by technology
At present, the metal passivation process is mainly hexavalent chromium salt and trivalent chromium salt passivation. The process is simple, the cost is low, and the corrosion resistance is good. The aerosol generated in the chemical treatment process and the wastewater in the production have serious harm to organisms and the environment
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[0015] The specific preparation steps of this embodiment are as follows:
[0016] a. Prepare a common low-cyanide zinc plating solution and adjust the pH value for electroplating.
[0017] b. After a certain period of time, take out the sample, and passivate it after exposure in 3% nitric acid. The passivation time is 10-20s.
[0018] c. Observe the color of the conversion coating layer, and conduct a neutral salt spray test.
[0019] A kind of chrome-free blue-white passivating agent process specification is:
[0020] Sodium tungstate, sodium citrate, cobalt nitrate
[0021]
[0022] Note: When there is agitation, the passivation time can be shortened and the passivation film is more uniform.
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The invention relates to a non-chrome white passivator, which is formed by uniformly dissolving and mixing the substances including sodium tungstate, sodium citrate, cobalt nitrate and the like according to a certain proportion. The non-chrome white passivator can be used for remarkably improving corrosion resistance and decorative performance of a coating and capable of achieving bright white color.
Description
technical field [0001] The invention relates to a chrome-free blue-white passivator, in particular to the components of the chrome-free blue-white passivator, the function of each component and a preparation method. Background technique [0002] Galvanizing is one of the steel anti-corrosion methods widely used at home and abroad. It is widely used in aviation, electric power, transportation, construction, machinery and other industries. However, the galvanized layer is easily corroded in the air, especially in a humid environment, so it must be carried out. Passivation treatment to improve the corrosion resistance of the galvanized layer. At present, the metal passivation process is mainly hexavalent chromium salt and trivalent chromium salt passivation. The process is simple, the cost is low, and the corrosion resistance is good. The aerosol generated in the chemical treatment process and the wastewater in the production have serious harm to organisms and the environment....
Claims
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Inventor 石磊许斌张明晓刘科高许峰源王光明
Owner SHANDONG JIANZHU UNIV