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Chromium-free steel surface treating liquid

A technology for steel surface and treatment liquid, applied in the direction of metal material coating process, etc., can solve problems such as impact, human health and environmental ecological damage, and achieve the effect of reducing costs, significant environmental and social benefits, and improving corrosion resistance.

Inactive Publication Date: 2015-02-25
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 chromium-free 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 the surface treatment solution to 3;

[0037] The mass concentration of molybdate is 0.5%;

[0038] The mass concentration of sodium polyphosphate is 2.5%;

[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 chromium-free 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] Acid used to adjust the pH of the surface treatment solution to 3.5;

[0048] The mass concentration of molybdate is 1.0%;

[0049] The mass concentration of sodium polyphosphate is 3.5%;

[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 chromium-free 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] Acid used to adjust the pH of the surface treatment solution to 3.5;

[0059] The mass concentration of molybdate is 1.5%;

[0060] The mass concentration of sodium polyphosphate is 8%;

[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 the present invention, when the above-mentioned chromium-free passivation solution is used to passivate the steel plate, a cathodic electrolytic passivation method o...

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PUM

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Abstract

The invention discloses a chromium-free steel surface treating liquid. The chromium-free steel surface treating liquid comprises the following components in mass concentration: 0.1%-1.5% of titanium salt, 2%-15% of a vanadium compound, 5%-20% of fluoride, 1%-2% of water soluble resin, an acid, 0.5%-1.5% of molybdate, 2%-8% of sodium polyphosphate and the balance of water and other unavoidable impurities, wherein the acid is used for regulating the pH value of a passivation solution to be 3-4. A surface treating process of the chromium-free steel surface treating liquid is simple, easy to implement and low in cost; the chromium-free surface treatment can be completely carried out on steel plates on a traditional chromium treatment production line only by adding few auxiliary instruments or equipment, so that the wastewater treatment is simplified, the cost is lowered, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to steel surface treatment technology, in particular to a chrome-free 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 tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44C23C22/34
CPCC23C22/44C23C22/36
Inventor 尤为
Owner WUXI EPIC TECH
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