Method for preparing aluminum part surface zincing powder and method for coating aluminum part surface zincing powder

A technology of zincizing and aluminum parts, applied in the field of zincizing the surface of aluminum parts, can solve the problem of difficult to maintain the corrosion resistance of aluminum and its alloys, and achieve the effect of high corrosion resistance and increased corrosion resistance

Inactive Publication Date: 2012-10-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practical applications have proved that physical shielding methods are difficult to maintain long-term good corrosion resistance of aluminum and its alloys in humid atmospheres, especially marine atmospheric environments containing a large amount of chloride ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) 52g of zinc powder; (2) 206.96g of silicon dioxide powder; (3) 0.52g of ammonium chloride; (4) 0.52g of ammonium sulfamate.

[0021] First, accurately weigh the above components, grind and mix them evenly, and the maximum diameter of the particles in the components should not exceed 150 microns. Put the mixed zinc treatment powder and the aluminum parts to be zinc treatment together in a sealed steel tank, then heat the steel tank and control the temperature at 410°C, keep the temperature for 180 minutes and then cool to room temperature.

[0022] The aluminum parts were separated from the zinc treatment powder for passivation treatment, and then subjected to a neutral salt spray test. After 1200 hours of the test, no significant rust was found on the surface of the aluminum parts.

Embodiment 2

[0024] (1) Zinc powder of 129.5g; (2) Aluminum oxide powder of 129.5g; (3) Ammonium nitrate of 0.5g; (4) Ammonium sulfamate of 0.5g.

[0025] First, accurately weigh the above components, grind and mix them evenly, and the maximum diameter of the particles in the components should not exceed 150 microns. Put the mixed zinc treatment powder and the aluminum parts to be zinc treatment together in a sealed steel tank, then heat the steel tank and control the temperature at 400°C, keep the temperature for 120 minutes and then cool to room temperature.

[0026] The aluminum parts were separated from the zinc treatment powder for passivation treatment, and then subjected to a neutral salt spray test. After 1600 hours of the test, no significant rust was found on the surface of the aluminum parts.

Embodiment 3

[0028] (1) 149g of zinc powder; (2) 20g of silicon dioxide powder; (3) 28.5g of aluminum oxide powder; (4) 0.8g of ammonium nitrate; (5) 0.4g of ammonium sulfamate.

[0029] First, accurately weigh the above components, grind and mix them evenly, and the maximum diameter of the particles in the components should not exceed 150 microns. Put the mixed zinc treatment powder and the aluminum parts to be zinc treatment together in a sealed steel tank, then heat the steel tank and control the temperature at 390°C, keep the temperature for 90 minutes and then cool to room temperature.

[0030] The aluminum parts were separated from the zinc treatment powder for passivation treatment, and then subjected to a neutral salt spray test. After 1500 hours of the test, no significant rust was found on the surface of the aluminum parts.

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Abstract

The invention discloses a method for preparing aluminum part surface zincing powder and a method for coating the aluminum part surface zincing powder. The aluminum part surface zincing powder comprises the following components in percentage by weight: 14.9 to 84.5 percent of zinc powder, 84.9 to 14.5 percent of inert metal oxide powder, 0.1 to 0.5 percent of activating agent and 0.1 to 0.5 percent of auxiliary agent. The coating method of the aluminum part surface zincing powder comprises the following steps of: placing the aluminum part surface zincing powder prepared by the preparation method and an aluminum part to be zinced in the same sealed steel can; heating the steel can; controlling the temperature to 400 + / -10 DEG C; after keeping the temperature for 60 to 180 minutes, cooling to the room temperature; and zincing and coating the surface of the aluminum part. The corrosion resistance of an aluminum plate processed by the method is obviously improved, and particularly the marine atmospheric environment corrosion resistance is greatly improved.

Description

technical field [0001] The present invention relates to a method for zincizing the surface of aluminum parts, more specifically to a preparation method and a coating method of zincizing powder for aluminum parts, which are suitable for aluminum components, steel components and cast iron components, etc., especially for aluminum parts Surface zinc treatment. Background technique [0002] Aluminum and its alloys are important metal materials next to steel materials. However, in the humid and polluted industrial atmosphere and marine atmosphere, aluminum and its alloys will be severely corroded and form white loose powdery corrosion products, which will affect the appearance of the product. and shortened service life. At present, more effective protection methods include: adjusting the elemental composition of aluminum alloys, anodic oxidation treatment, organic coating treatment and passivation treatment, etc. These methods delay the occurrence and development of corrosion of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/36
Inventor 程学群李晓刚杜翠薇高瑾
Owner UNIV OF SCI & TECH BEIJING
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