Normal temperature passivated zinc coating trivalent chromium color passivating agent

A galvanized layer, trivalent chromium technology, applied in the direction of metal material coating process, can solve problems such as unbearable for users, harsh working environment, large workpiece loss, etc., to save energy consumption, low production cost, and improve durability. Effects of Corrosive Properties

Inactive Publication Date: 2006-11-08
SUR PRECISION METAL TECH
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Problems solved by technology

However, this high-concentration passivation solution not only has high production costs, but also causes great loss from the workpiece, which is unbearable for users.
At the same time, because...

Method used

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Examples

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Embodiment Construction

[0009] In a one-liter beaker, add 500 ml of deionized water, and add 15.3 g of chromium chloride (containing 3.0 Cr 3+ ), after completely dissolving, sequentially add 16.7g of molybdate, 18g of NaNO 3 , 8.4g of malonic acid, 1.6g of phosphate, stirred for one hour; then added 10.2g of cobalt sulfate, stirred for two hours, added 3.2g of ammonium bifluoride and 1.2g of silicate, continued to stir for 30 minutes; then Add deionized water to a volume of 1 liter, and then use sodium carbonate or nitric acid to adjust the pH value of the passivation solution to 1.9, ready for use.

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Abstract

The present invention discloses trivalent chromium color zinc coating passivator for passivation at normal temperature and its preparation process. The trivalent chromium color zinc coating passivator includes Cr3+ 1-7.5g/L, molybdate 1-25g/L, cobalt sulfate 5-15, ammonium bifluoride 1-8g/L, malonic acid 1-12g/L, phosphate 1-12 g/L, and silicate 0.2-6g/L. The trivalent chromium color zinc coating passivator solution has pH 1.8-2.3 regulated with sodium carbonate or nitric acid, passivating temperature of 20-35deg.c, passivating time of 30-60 sec and stoving temperature of 70-80deg.c. The present invention has the advantages of being practical and good use effect.

Description

technical field [0001] The invention relates to a color passivation treatment agent for galvanized iron and steel. Background technique [0002] Steel parts are usually passivated after electro-galvanizing or hot-dip galvanizing to prevent white rust in a short time. The color passivation process can form a thick iridescent passivation film mainly in red and green on the galvanized layer, which is not only beautiful but also has excellent anti-corrosion effect. Traditional hexavalent chromium color passivators cause serious pollution to the environment, and are gradually being replaced by environmentally friendly trivalent chromium passivators. It is not easy to form a colored passivation film on the galvanized layer by the trivalent chromium passivation process, because trivalent chromium ions usually can only produce blue or white passivation film, and the colored passivation film is due to the hexavalent chromium ion. obtained by the action of chromium ions. In additio...

Claims

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Application Information

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IPC IPC(8): C23C22/07
CPCC23C22/44C23C2222/10
Inventor 李树泉曾广亮谢金平
Owner SUR PRECISION METAL TECH
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