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Rare earth neodymium containing trivalent chromium blue and white passivation liquid and preparation method thereof

A technology of trivalent chromium and passivation solution, applied in the direction of metal material coating process, etc., can solve the problems of microporous defects, rough surface of passivation film, etc., to improve air tightness and corrosion resistance, and uniform film layer. dense effect

Inactive Publication Date: 2014-04-30
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a kind of rare earth neodymium containing rare earth neodymium in order to solve the technical problems such as rough surface of the obtained passivation film and the presence of micropore defects when the existing trivalent chromium passivation solution is used to passivate the surface of galvanized parts. Trivalent chromium blue-white passivation solution, the passivation film formed by the trivalent chromium blue-white passivation solution containing rare earth neodymium on the surface of galvanized parts is bright, blue-white, thick and uniform Good corrosion resistance

Method used

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  • Rare earth neodymium containing trivalent chromium blue and white passivation liquid and preparation method thereof
  • Rare earth neodymium containing trivalent chromium blue and white passivation liquid and preparation method thereof
  • Rare earth neodymium containing trivalent chromium blue and white passivation liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A trivalent chromium blue-white passivation solution containing rare earth neodymium, calculated per liter, its composition and content are as follows:

[0035] 18g chromium sulfate

[0036] 2.2g sodium nitrate

[0037] 7g cobalt sulfate heptahydrate

[0038] 3.4g sodium hypophosphite

[0039] 0.7g citric acid

[0040] 0.2g ammonium bifluoride

[0041] 0.28g neodymium nitrate

[0042] The balance is deionized water.

[0043] A kind of preparation method of above-mentioned trivalent chromium blue-white passivation solution containing rare earth neodymium, the steps are as follows:

[0044] First, under the condition of continuous stirring, dissolve 18g of chromium sulfate in 500ml of deionized water, then add 0.7g of citric acid, 3.4g of sodium hypophosphite, and 2.2g of sodium nitrate to dissolve it, and then add 7g of cobalt sulfate heptahydrate And make it fully dissolved, finally add 0.2g ammonium bifluoride and 0.28g neodymium nitrate succe...

Embodiment 2

[0075] A trivalent chromium blue-white passivation solution containing rare earth neodymium, calculated per liter, its composition and content are as follows:

[0076] 15g chromium sulfate

[0077] 2g sodium nitrate

[0078] 6g cobalt sulfate heptahydrate

[0079] 2.5g sodium hypophosphite

[0080] 0.5g citric acid

[0081] 0.15g ammonium bifluoride

[0082] 0.14g neodymium nitrate

[0083] The balance is deionized water.

[0084] A kind of preparation method of above-mentioned trivalent chromium blue-white passivation solution containing rare earth neodymium, the steps are as follows:

[0085] First, under the condition of continuous stirring, dissolve 15g of chromium sulfate in 500ml of deionized water, then add 0.5g of citric acid, 2.5g of sodium hypophosphite, and 2g of sodium nitrate to dissolve it, then add 6g of cobalt sulfate heptahydrate and Make it fully dissolved, and finally add 0.15g of ammonium bifluoride and 0.14g of neodymium nitrate s...

Embodiment 3

[0094] A trivalent chromium blue-white passivation solution containing rare earth neodymium, calculated per liter, its composition and content are as follows:

[0095] 20g chromium sulfate

[0096] 3g sodium nitrate

[0097] 8g cobalt sulfate heptahydrate

[0098] 4g sodium hypophosphite

[0099] 0.8g citric acid

[0100] 0.25g ammonium bifluoride

[0101] 0.42g neodymium nitrate

[0102] The balance is deionized water.

[0103] A kind of preparation method of above-mentioned trivalent chromium blue-white passivation solution containing rare earth neodymium, the steps are as follows:

[0104] First, under the condition of continuous stirring, dissolve 20g of chromium sulfate in 500ml of deionized water, then add 0.8g of citric acid, 4g of sodium hypophosphite, and 3g of sodium nitrate to dissolve them, then add 8g of cobalt sulfate heptahydrate and make It is fully dissolved, and finally add 0.25g of ammonium bifluoride and 0.42g of neodymium nitrate ...

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Abstract

The invention discloses a rare earth neodymium containing trivalent chromium blue and white passivation liquid and a preparation method thereof. Every liter of rare earth neodymium containing trivalent chromium blue and white passivation liquid comprises 15-20g of chromium sulfate, 2.0-3.0g of sodium nitrate, 6.0-8.0g of cobaltous sulfate heptahydrate, 2.5-4.0g of sodium hypophosphite, 0.5-0.8g of citric acid, 0.15-0.25g of ammonium bifluoride, 0.14-0.42g of neodymium nitrate and the balance of deionized water. The preparation method comprises steps of under a continuously stirring state, firstly dissolving chromium sulfate into part of deionized water, then sequentially adding citric acid, sodium hypophosphite and sodium nitrate and dissolving, adding cobaltous sulfate heptahydrate and fully dissolving, finally adding ammonium bifluoride and neodymium nitrate, adding the balance of deionized water, standing for 24 hours so as to obtain the rare earth neodymium containing the trivalent chromium blue and white passivation liquid. After a zinc plating piece is passivated by the passivation liquid, a bright, uniform and compact blue and white passivation membrane with good corrosion resistance can be formed.

Description

technical field [0001] The invention relates to a metal passivation solution, in particular to a trivalent chromium blue-white passivation solution containing rare earth neodymium and a preparation method thereof, belonging to the technical field of metal surface treatment. Background technique [0002] Galvanizing the steel surface is one of the effective ways to improve the anticorrosion effect of steel. However, in a humid environment, the surface of the galvanized layer will corrode and produce white rust, which will affect the appearance and corrosion resistance of the galvanized layer. Therefore, it is very necessary to passivate the surface of the galvanized layer. [0003] Traditional passivation treatment mostly adopts hexavalent chromium passivation process. The passivation film has good corrosion resistance, strong appearance decoration, low cost and self-healing property, so it has been well applied. Because hexavalent chromium is toxic and carcinogenic, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
Inventor 韩生黄奇缪树婷郝利峰
Owner SHANGHAI INST OF TECH
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