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Chromium-free passivation liquid for galvanized sheet and manufacture method thereof

A chromium-free passivation, galvanized sheet technology, applied in the direction of metal material coating process, can solve the problem that the corrosion resistance can not fully meet the actual application requirements, and achieve the effect of increasing the bonding force and improving the corrosion resistance.

Inactive Publication Date: 2008-08-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The research on chromium-free passivation of galvanized sheet, whether it is pure inorganic salt passivation or the passivation technology of adding inorganic substances to polymer organic substances, can not fully meet the practical application requirements in terms of corrosion resistance. After 72h NSS test The post-corrosion area percentages are all greater than 5%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A chromium-free passivation solution for galvanized sheets and its preparation method: first dissolve 10-12 g of cerium nitrate in a stirring tank and add it while stirring 3.0-3.2g of sodium lauryl sulfate, 0.4-0.6g of OP-10 and 0.6-0.8g of n-butanol, then add 20-22g of silica sol and 150-170mL of silicon acrylic emulsion , 5-8g of phytic acid, and finally add the remaining water and adjust the pH to 2.0-2.5 with inorganic acid or alkali, and stir for 2 hours at 20-30°C to obtain a chromium-free passivation solution. The solid content of the silicone acrylic emulsion in the example is 40-45%, and the pH value is 7.0-9.0; the SiO in the silica sol 2 The content is 30wt%.

[0033] The process of this embodiment is simple, and the operating conditions of passivation are the same as those of the existing process. The prepared chromium-free passivation solution has good stability and is easy to form a dense organic / inorganic composite passivation film on the zinc layer. ...

Embodiment 2

[0035] A chromium-free passivation solution for galvanized sheets and its preparation method: first dissolve 12-15 g of cerium chloride and add it to a stirring tank, and stir while stirring Add 3.2-3.5g of sodium lauryl sulfate, 0.4-0.6g of OP-10 and 0.4-0.6g of n-butanol, then add 22-25g of silica sol, 170-200mL of silicon acrylic acid Emulsion, 8-10g of citric acid, and finally add the rest of water and adjust the pH to 2.5-3.0 with inorganic acid or alkali, and stir for 2 hours at 20-30°C to obtain a chromium-free passivation solution. The solid content of the silicone acrylic emulsion in the example is 40-45%, and the pH value is 7.0-9.0; the SiO in the silica sol 2 The content is 30wt%.

[0036]The process of this embodiment is simple, and the operating conditions of passivation are the same as those of the existing process. The prepared chromium-free passivation solution has good stability and can form a dense organic-inorganic hybrid passivation film on the zinc laye...

Embodiment 3

[0038] A chrome-free passivation solution for galvanized sheets and its preparation method: first dissolve 15-20 g of sodium tungstate and add it to a stirring tank, and stir while stirring Add 3.5~3.8g of sodium lauryl sulfate, 0.4~0.6g of OP-10 and 0.6~0.8g of n-butanol, then add 12~15g of silica sol, 8~10g of alkoxysilane Coupling agent, 200-220mL of silicon-acrylic emulsion, 10-12g of tannic acid, finally add the rest of water and adjust the pH to 3.0-3.5 with inorganic acid or alkali, stir for 2 hours at 20-30°C, that is Chromium-free passivation solution. The solid content of the silicone acrylic emulsion in the example is 40-45%, and the pH value is 7.0-9.0; the SiO in the silica sol 2 The content is 30wt%.

[0039] The process of this embodiment is simple, and the operating conditions of passivation are the same as those of the existing process. The prepared chromium-free passivation solution has good stability and is easy to form a dense organic / inorganic composite...

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Abstract

The invention in particular relates to passivation solution without chrome which is used for galvanized sheets and a method thereof. The technical scheme thereof comprises: firstly, dissolving inorganic salt corrosion inhibitor, then, adding the inorganic salt corrosion inhibitor into a stirred tank, adding dispersant, organic acid, sealant, silicone-acrylate emulsion and water while stirring, then, using inorganic acid or alkali to regulate the pH value to be 2.0-5.0, and then stirring for 1-2 hours under the condition that the temperature is 20-30 DEG C, the content of the components of each liter is: the inorganic salt corrosion inhibitor 10-55g, additive 4-10g, the organic acid 5-20g, the sealant 5-30g, the silicone-acrylate emulsion 150-300g, and the rest is the water. The method of the invention can additionally form a layer of organic resin separate layer on the basis of forming an inorganic metal compound precipitation film, additionally, since the silicon compound is added, not only the binding force between a passivation layer and zinc coating can be increased, but also the corrosion resistance, the scrubbing resistance and the wear resistance of the passivation layer can be increased, and the coating treatment after passivation can not be affected.

Description

technical field [0001] The invention belongs to the technical field of chromium-free passivation. In particular, it relates to a chromium-free passivation solution for improving the corrosion resistance of galvanized sheets and a preparation method thereof. Background technique [0002] Since the corrosion resistance of galvanized sheets cannot fully meet the requirements in some special industries, and galvanized products will be prone to surface discoloration and even white rust spots during transportation and storage for a long time, it is necessary to Passivation treatment is carried out to further improve the corrosion resistance of the steel plate and prolong its service life. [0003] The traditional passivation treatment is mainly hexavalent chromium passivation based on chromate. Chromate passivation has the advantages of good corrosion resistance of passivation film, mature technology, low cost, simple operation, beautiful appearance and self-healing ability, etc...

Claims

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Application Information

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IPC IPC(8): C23C22/07
Inventor 伍林王静易德莲黄峰刘敏
Owner WUHAN UNIV OF SCI & TECH
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