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Surface treatment liquid for iron and steel

A steel surface and treatment liquid technology, applied in the field of steel surface treatment, can solve problems such as human health and environmental ecological damage and impact, and achieve significant environmental and social benefits, reduce costs, and reduce pollution.

Inactive Publication Date: 2015-03-04
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the passivation solution disclosed in the above-mentioned patent, after the surface of the steel or galvanized layer is treated with the above-mentioned passivation solution, its surface anticorrosion performance is greatly improved, but the heavy metal ions and hexavalent chromium contained in the passivation solution are harmful to human health and Serious damage and impact on the environment and ecology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A steel surface treatment liquid, comprising the following components:

[0032] The mass concentration of titanium salt is 0.1%;

[0033] The mass concentration of vanadium compound is 2%;

[0034] The mass concentration of fluoride is 5%;

[0035] The mass concentration of water-soluble resin is 1%;

[0036] Acids used to adjust the pH of steel surface treatment solutions to 3;

[0037] The mass concentration of oxalic acid is 2%;

[0038] The mass concentration of citric acid is 2%;

[0039] The balance is water and other unavoidable impurities.

[0040] The vanadium compound mentioned above is ammonium polyvanadate; the titanium salt is titanium chloride; the water-soluble resin is a cationic acrylate copolymer, and the fluoride is sodium fluoride.

Embodiment 2

[0042] A steel surface treatment liquid, comprising the following components:

[0043] The mass concentration of titanium salt is 0.5%;

[0044] The mass concentration of vanadium compound is 5%;

[0045] The mass concentration of fluoride is 10%;

[0046] The mass concentration of water-soluble resin is 1.2%;

[0047] Acids used to adjust the pH of steel surface treatment solutions to 3.5;

[0048] The mass concentration of oxalic acid is 3%;

[0049] The mass concentration of citric acid is 2.5%;

[0050] The balance is water and other unavoidable impurities.

[0051] The vanadium compound mentioned above is vanadyl dichloride solution; the titanium salt is titanium sulfate; the water-soluble resin is cationic styrene-acrylic emulsion polymer, and the fluoride is sodium fluoride.

Embodiment 3

[0053] A steel surface treatment liquid, comprising the following components:

[0054] The mass concentration of titanium salt is 1.0%;

[0055] The mass concentration of vanadium compound is 10%;

[0056] The mass concentration of fluoride is 15%;

[0057] The mass concentration of water-soluble resin is 1.5%;

[0058] Acids used to adjust the pH of steel surface treatment solutions to 3.5;

[0059] The mass concentration of oxalic acid is 5%;

[0060] The mass concentration of citric acid is 4%;

[0061] The balance is water and other unavoidable impurities.

[0062] The vanadium compound mentioned above is a vanadium sulfate solution; the titanium salt is sodium titanate; the water-soluble resin is a cationic epoxy acrylic acid copolymer, and the fluoride is sodium fluoride.

[0063] In this method, oxalic acid and citric acid are preferably added, because phosphoric acid is a medium-strength acid, which is not as strong as hydrochloric acid, sulfuric acid and nitric ...

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PUM

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Abstract

The invention discloses surface treatment liquid for iron and steel. The surface treatment liquid comprises the following components: titanium salt of which the mass concentration is 0.1-1.5%, vanadium compounds of which the mass concentration is 2-15%, fluoride of which the mass concentration is 5-20%, water-soluble resin of which the mass concentration is 1-2%, an acid which is used for adjusting the pH value of the surface treatment liquid to 3-4, oxalic acid of which the mass concentration is 2-5%, citric acid of which the mass concentration is 2-4%, and the balance of water and other inevitable impurities. The surface treatment liquid disclosed by the invention does not contain carcinogen hexavalent chromium (chromate) or toxic metal ions, so that environmental pollution is greatly alleviated, and the cost is substantially reduced. Phosphoric acid which is an acid with medium strength is not as strong as a hydrochloric acid, a sulphuric acid and a nitric acid, so that when the phosphoric acid, an oxalic acid and a citric acid are jointly used, the total acidity and the free acidity can be improved, the effects of removing rust and removing scales can be achieved, and moreover, the citric acid not only enhances the acidity but also can have a complexing effect on iron ions.

Description

technical field [0001] The invention relates to steel surface treatment technology, in particular to a steel surface treatment liquid. Background technique [0002] Iron and steel accounts for more than 90% of the use of metal materials. It is the most widely used metal in daily life, but it is the most easily corroded metal. Nearly 30% of the steel products produced in the world every year are corroded to varying degrees, and about 10% of them are corroded. Steel products will be scrapped. The annual economic loss caused by corrosion in the world is about 700 billion U.S. dollars, accounting for about 2%-4% of the national economic output value of various countries. The performance of steel equipment is also reduced due to corrosion, which seriously threatens production safety and greatly reduces production efficiency. [0003] There are many anti-corrosion treatment technologies for steel, but phosphating treatment and chromate passivation treatment are the two most commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/36
CPCC25D11/36
Inventor 尤为
Owner WUXI EPIC TECH
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