Galvanized layer chromium-free passivant and use method thereof

A technology of chromium-free passivation agent and galvanized layer, applied in the direction of metal material coating process, etc., can solve the problems of environmental and human pollution, harm and so on

Active Publication Date: 2010-06-02
GUIZHOU WIRE ROPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The passivation agent for the traditional surface treatment zinc coating is generally formulated with chromate or chromic anhydride to form a high-chromium or low-chromium passivation agent, which will cause pollution and harm to the environment and human body when used

Method used

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Embodiment Construction

[0021] The chromium-free passivating agent for the galvanized layer is composed of a passivating film-forming agent, an adhesion promoter, an emulsifier and a solvent, wherein the passivating film-forming agent includes formic acid, citric acid, tannic acid, oxalic acid, phytic acid, boron salt; the adhesion promoter is epoxy resin; the emulsifier is 6501; the solvent is acetone and water, and the percentages of each component in the total weight are:

[0022] Passivation film former: 10% formic acid, 5% citric acid, 1% tannic acid, 3% oxalic acid, 7% phytic acid, 0.5% borate;

[0023] Adhesion promoter: epoxy resin 2.5%;

[0024] Emulsifier 2%;

[0025] Solvent: acetone 4%, water 65%.

[0026] When in use, dilute the above-mentioned chromium-free passivating agent with water by 1:4 and put it into the passivation tank for steel wire galvanizing. For the passivation tank, adjust the running speed of the steel wire to make the passivation time 5-20 seconds. After taking it o...

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Abstract

The invention relates to a galvanized layer chromium-free passivant and a use method thereof, wherein the passivant comprises a passivation film-forming agent, an adhesion promoter, an emulsifying agent, acetone and an aqueous solution, when using, the chromium-free passivant and water are diluted according to the proportion of 1: 4 and then put in a passivation tank, a galvanized part is bright-dipped through diluted acid at a plating bath outlet of a continuous electrogalvanizing production line, then enters into the passivation tank under the normal temperature for passivating 5-20 seconds, taken out, flushed with water and dried by hot air. The galvanized layer chromium-free passivant forms a passivation film on the metal surface by reasonably utilizing certain chromium-free organic acids, and the like, has corrosion inhibition property, adopts resin as the promoter as well as the acetone and water as solvents, is prepared by adopting a compound method, free of chromium and used for carrying out passivating treatment instead of chromate and chromium trioxide and eliminates hazards to the environment and the human body from chromium pollution.

Description

technical field [0001] The invention relates to a chromium-free passivator for surface treatment of galvanized layers, belonging to the technical field of surface treatment. Background technique [0002] The passivation agent for the traditional surface treatment zinc coating is generally formulated as a high-chromium or low-chromium passivation agent with chromate or chromic anhydride. When this passivation agent is used, it will cause pollution and harm to the environment and human body. Therefore, it is necessary to explore and screen out chromium-free organic compounds and inorganic compounds that can form a passivation film on the galvanized layer like chromium compounds, so as to realize the chromium-free clean production of galvanized passivation. Contents of the invention [0003] The purpose of the present invention is to provide a kind of chromium-free passivator that utilizes some chromium-free organic compounds and chromium-free inorganic compounds to form a pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53
Inventor 黄忠渠鄢光林周宁雅黄华江
Owner GUIZHOU WIRE ROPE
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