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Plasma spraying zinc-aluminum high-strength steel as well as preparation method and application thereof

A high-strength steel and plasma technology, applied in coating, fusion spraying, metal material coating technology, etc., can solve the problems of short service life, ineffective effect, high maintenance cost, etc.

Inactive Publication Date: 2018-07-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, thermal spraying zinc-magnesium coating or zinc coating cathodic protection is usually used on the surface of high-strength steel to improve the resistance to chloride ion erosion of high-strength steel, but the actual effect is not obvious, the service life is short, and the later maintenance cost is high.

Method used

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  • Plasma spraying zinc-aluminum high-strength steel as well as preparation method and application thereof

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preparation example Construction

[0019] The invention provides a method for preparing zinc-aluminum high-strength steel by plasma spraying, comprising the following steps:

[0020] Ball milling zinc powder, aluminum powder and rare earth metal powder to obtain composite metal powder; the mass ratio of the zinc powder, aluminum powder and rare earth metal powder is (84-87): (13-14.5): (0.2-0.6) ;

[0021] Perform pretreatment and shot blasting on the surface of high-strength steel in sequence to obtain high-strength steel substrate;

[0022] The composite metal powder is sprayed on the surface of the high-strength steel substrate by a plasma spraying method, and a zinc-aluminum coating is formed on the surface of the high-strength steel substrate to obtain a plasma-sprayed zinc-aluminum high-strength steel.

[0023] In the present invention, zinc powder, aluminum powder and rare earth metal powder are ball milled to obtain composite metal powder; the mass ratio of the zinc powder, aluminum powder and rare ear...

Embodiment 1

[0040] According to the mass ratio of zinc powder, aluminum powder and cerium metal powder is 86:13.8:0.2, zinc powder, aluminum powder and cerium metal powder are mixed, add n-butanol and stearic acid (the amount of zinc powder, aluminum powder and cerium metal powder The mass ratio of the total mass to n-butanol and stearic acid is 1:2:2), under the protection of argon, ball mill at a speed of 350r / min for 10h, and vacuum-dry the obtained slurry at 60°C to obtain a composite metal pink;

[0041] Use 180#, 240#, 320#, 600#, 800#, 1200#, 2000# silicon carbide sandpaper to polish the surface of BR1500HS high-strength steel in sequence, and use 10wt.% NaOH solution as alkaline washing solution to polish at 50°C The steel is subjected to alkali washing for 2 hours, and the alkali-washed steel is rinsed with deionized water, and 6wt.% HCl solution is used as the pickling liquid, and the water-washed steel is acid-washed at room temperature for 30 minutes, and the pickled steel is ...

Embodiment 2

[0044] The plasma-sprayed zinc-aluminum high-strength steel was prepared according to the method of Example 1, except that the ball milling time was 14 hours, and the spraying distance was 85 mm.

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Abstract

The invention provides a preparation method of plasma spraying zinc-aluminum high-strength steel. Zinc powder, aluminum powder and rare earth metal powder are subjected to ball grinding to obtain compound metal powder, wherein the mass ratio of the zinc powder to the aluminum powder to the rare earth metal powder is (84 to 87):(13 to 14.5):(0.2 to 0.6); the high-strength steel surface is sequentially subjected to pretreatment and shot blasting to obtain a high-strength steel substrate; the compound metal powder is sprayed and coated on the surface of the high-strength steel substrate by a plasma spraying method; a zinc-aluminum coating is formed at the surface of the high-strength steel substrate; the plasma spraying zinc-aluminum high-strength steel is obtained. The plasma spraying zinc-aluminum high-strength steel provided by the invention has good corrosion resistant performance and is applicable to severe conditions in marine environment. Experimental results of the embodiment showthat the polarization resistance of the plasma spraying zinc-aluminum high-strength steel provided by the invention reaches 1357 Omega.cm<2>, and the corrosion potential reaches -1.03V.

Description

technical field [0001] The invention relates to the technical field of metal surface coating, in particular to a plasma-sprayed zinc-aluminum high-strength steel and a preparation method and application thereof. Background technique [0002] Corrosion of steel is a very common phenomenon, especially in the environment of high humidity and high chloride ion concentration in the ocean. Due to the erosion of chloride ions and the formation of local oxygen concentration differences, the electrochemical corrosion caused by the primary battery will first occur locally on the steel Corrosion, namely pitting corrosion, the corrosion rate of pitting corrosion is extremely fast, which will cause the local mechanical properties of steel materials to decline rapidly after a period of time, which in turn will not meet the requirements of strength and hardness required by actual engineering. [0003] High-strength steel has excellent comprehensive mechanical properties and is an important...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/02C23C4/08
CPCC23C4/134C23C4/02C23C4/08
Inventor 钟庆东徐云祥罗均鲁雄刚孙中渠蒲华燕汪小帆彭艳谢少荣
Owner SHANGHAI UNIV
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