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Chronium-free deactivator solution for preventing white rust in galvanized layer and its coating method

A technology of chromium-free passivation and galvanized layer, which is applied in the direction of coating, metal material coating process, and device for coating liquid on the surface, etc., can solve the problems such as the need to improve the bonding force of the corrosion-resistant coating, and achieve the goal of overcoming the problem of bonding. Poor strength, good anti-white rust performance, good binding effect

Inactive Publication Date: 2007-06-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in harsh corrosive environments, its corrosion resistance and bonding force with the coating still need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Measure 92ml of ethanol and 828ml of distilled water to make a hydrolysis solvent, add 80ml of silane coupling agent to hydrolyze to make a silane solution, then add 3g of sodium molybdate, potassium molybdate or ammonium molybdate, adjust the pH value to 3~5, and obtain clarification treatment fluid. The treatment conditions are as follows: at room temperature, immerse the hot-dip galvanized sample in the treatment solution for 30 to 120 seconds, and place it in the air to dry naturally.

Embodiment 2

[0020] Measure 475ml of methanol and 9025ml of distilled water to make a hydrolysis solvent, add 500ml of silane coupling agent to make a silane solution, then add 50g of sodium molybdate, adjust the pH value to 3-5, and obtain a clarification treatment solution. The treatment conditions are as follows: at room temperature, use a brush to get the treatment solution and brush it on the surface of the hot-dip galvanized sample for 30-120 seconds, then place it in a drying box, and dry it at a temperature of 90-120°C.

Embodiment 3

[0022] Measure 92ml of propanol and 828ml of distilled water to make a hydrolysis solvent, add 50ml of silane coupling agent to make a silane solution, then add 2g each of sodium molybdate and potassium molybdate, adjust the pH value to 3-5, and obtain a clarification treatment solution. The treatment conditions are as follows: at room temperature, spray the treatment solution on the surface of the hot-dip galvanized sample for 30 to 120 seconds, and place it in the air to dry naturally.

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PUM

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Abstract

The present invention discloses one kind of chromium-free deactivator solution for preventing white rust in galvanized layer and its coating method. Into silane solution containing cilane coupler in 1-50 vol% concentration, molybdenate corrosion inhibitor in 1-30 g / L is added to compound pH 3-7 clear transparent deactivator solution. The deactivator solution is soaked, brushed or sprayed to the surface of galvanized layer to form one adhesive transparent spontaneously curing protecting layer with corrosion resistance similar to that of conventional chromate. The method can prevent white rust formed in the surface of galvanized product and is environment friendly.

Description

technical field [0001] The invention relates to a chromium-free passivation solution for preventing white rust on a galvanized layer and a coating method thereof. Background technique [0002] Galvanizing (mainly including hot-dip galvanized layer, electro-galvanized layer, thermal sprayed galvanized layer and mechanical galvanized layer and other coatings) is an effective method to improve the ability of steel to resist atmospheric corrosion, so it is widely used in electric power, transportation, automobiles, communications, construction, etc. and daily civilian use. However, in a humid environment, especially during the storage and transportation of galvanized sheets or galvanized parts, the galvanized layer is prone to corrosion, and white loose corrosion products (also known as "storage and transportation wet rust" or "white rust") are formed on the surface of the coating. "Rust", see GB13912) makes the white and bright coating become dull and dull, which affects the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/40C23C22/68B05D7/24B05D3/02
CPCC23C2222/20
Inventor 卢锦堂孔纲车淳山许乔瑜吴海江
Owner SOUTH CHINA UNIV OF TECH
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