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Composite color-coating chromium-free passivating solution based on waterborne epoxy resin for galvanized sheet

A water-based epoxy resin, chromium-free passivation technology, applied in the direction of metal material coating process, etc., to achieve excellent water resistance and alkali resistance, improve corrosion resistance, and reduce costs.

Inactive Publication Date: 2013-07-24
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this patent is to overcome the problem of using chromium-containing surface treatment liquid for existing color-coated sheets, and provide a chromium-free passivation solution for color-coated galvanized sheets based on water-based epoxy resin composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Prepare 1 liter of passivation solution with a pH value of 2~3 with an effective content of 100g of organic resin, 20g of organic acid, 3.3g of inorganic passivator, 3g of oxidant, and the rest of water and phosphoric acid. Among them, the organic resin is water-based epoxy resin and water-based curing agent resin, which are prepared according to the mass ratio of effective content of 2:1. The inorganic passivation agent is titanium oxysulfate and nickel nitrate, which is prepared according to the mass ratio of effective content of 1:6.

[0034] After the galvanized sheet pretreated by the above process, the area of ​​white rust in the 96h neutral salt spray test is less than 20%. After the electrochemical test, the self-corrosion potential is -0.9943V, and the self-corrosion current density is 108.3000 μA cm -2 , the polarization resistance is 0.3460kΩ·cm -2 . The scratch test found that there were peeling marks on the smooth edge of the cut, but the pee...

Embodiment 2

[0035] Example 2: Use organic resin with an effective content of 100g, 20g of organic acid, 3.3g of inorganic passivator, 3g of oxidant, and the rest of water and phosphoric acid to prepare 1 liter of passivation solution with a pH value of 2~3. Among them, the organic resin is water-based epoxy resin and water-based curing agent resin, which are formulated according to the mass ratio of the effective content of 1:2. The inorganic passivation agent is titanium oxysulfate and nickel nitrate, which is prepared according to the mass ratio of effective content of 1:3.

[0036] After the galvanized sheet pretreated by the above process, the area of ​​white rust in the 96h neutral salt spray test is less than 15%. After the electrochemical test, the self-corrosion potential is -0.9340V, and the self-corrosion current density is 74.9900 μA cm -2 , the polarization resistance is 0.5150kΩ·cm -2 . The scratch test found that there were peeling marks on the smooth edge of the cut, b...

Embodiment 3

[0037] Example 3:Prepare 1 liter of passivation solution with a pH value of 2~3 with an effective content of 150g of organic resin, 50g of organic acid, 5.8g of inorganic passivator, 12g of oxidant, and the rest of water and phosphoric acid. Among them, the organic resin is water-based epoxy resin and water-based curing agent resin, which are formulated according to the mass ratio of the effective content of 1:2. The inorganic passivation agent is titanium oxysulfate and nickel nitrate, which is prepared according to the mass ratio of effective content of 1:6.

[0038] After the galvanized sheet pretreated by the above process, the area of ​​white rust in the 96h neutral salt spray test is less than 15%. After the electrochemical test, the self-corrosion potential is -0.9330V, and the self-corrosion current density is 30.5600 μA cm -2 , the polarization resistance is 1.3610kΩ·cm -2 . The scratch test found that there were peeling marks on the smooth edge of the cut, but t...

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Abstract

The invention provides a chromium-free passivation solution for color coating of galvanized sheets based on water-based epoxy resin composite, and belongs to the technical field of surface treatment of galvanized sheets. The components of the chromium-free passivation solution and their content per liter are: organic resin: 100~300g / L; organic acid: 20~75g / L; inorganic salt: 2~6g / L; oxidizing agent: 3~12g / L ; pH regulator: appropriate amount; deionized water: balance. Phosphoric acid is used as a pH regulator to adjust the pH of the chromium-free passivation solution to 2-3. The present invention is characterized in that water-based epoxy resin, organic acid, inorganic salt and oxidizing agent are organically combined to form a dense organic-inorganic composite passivation film after acting on the galvanized sheet. The chromium-free passivation solution provided by the invention is beneficial to simplify the color coating process of the galvanized sheet and reduce the cost. The invention does not contain chromium in any valence state, and is an environment-friendly chromium-free passivation solution.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of galvanized sheets, and in particular relates to a chromium-free passivation solution for color coating of galvanized sheets based on water-based epoxy resin composite. technical background [0002] In order to improve the corrosion resistance and coating performance of color-coated galvanized sheets, hexavalent chromium is often used in industry to passivate the surface of galvanized sheets. However, according to the EU RoHS standard, surface passivation solutions containing hexavalent chromium are strictly regulated limits. At present, the research on the surface treatment solution of galvanized sheet is concentrated on the chromium-free passivation solution, which mainly includes inorganic passivation (using molybdate, silicate, rare earth salt and other inorganic salt passivation) and organic passivation (using plant acid, tannic acid, silane, resin and other organic matter passiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07
Inventor 张千峰叶鹏飞陈均胡丰徐丽萍
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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