Shot material for mechanical plating, and high corrosion resistant coating using the same

A mechanical and film technology, applied in metal material coating process, pressure inorganic powder coating, abrasives, etc., can solve the problems of low corrosion resistance, high treatment price, complicated treatment liquid management, etc., to improve corrosion resistance, cost reduction effect

Active Publication Date: 2006-11-29
DOWA ELECTRONICS MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, a significant reduction in corrosion resistance has been caused at the damaged place
In addition, these techniques that do not use hexavalent chromium have the disadvantages of complicated management of the treatment liquid, and fluctuations in the characteristics after treatment, and the treatment price is considerably higher than that of hexavalent chromate treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] [Invention Example 1]

[0043] 50 kg of a zinc alloy melt with a composition of Zn-3.5% by mass Al-8.0% by mass Mg (other impurities less than 1% by mass) is maintained at 570°C for homogenization, and then cut to maintain the burning temperature at 570°C Burner, then immediately put 65kg of steel grit into the melt while stirring. The steel grit used was a commercially available product having an average particle size of 237 μm and an average hardness of 312 HV. As the temperature drops, when the melt becomes a semi-solidified state, the mixture of zinc-based alloy and steel grit is taken out, and when it is not completely solidified, it is moved to a pulverizer to start pulverization. Then, the individual steel grit grains are separated and pulverized to approximately spherical surface properties to obtain a projection material.

[0044] The average particle size of the projection material is 218 μm. In addition, the cross-section of the particles of the projection materi...

example 1

[0058] ·Invention example 1: 5160 hours,

[0059] ·Invention example 2: 1920 hours,

[0060] ·Comparative example 1: <24 hours,

[0061] · Comparative example 2 (chromate treatment): 3000 hours.

[0062] According to the present invention, it is known that high corrosion resistance can be imparted to the occurrence time of red rust in the salt spray test for more than 1800 hours. In particular, the example of increasing the Mg content in the film (Invention Example 1) can provide much more than that of chromate. Excellent corrosion resistance of the treatment.

Embodiment 2

[0064] In each of the invention examples and comparative examples shown in Example 1, cold rolled steel sheets (SPCC) with a thickness of 0.8 mm were used instead of bolts as the materials to be processed, and the surfaces were subjected to mechanical spraying under the same conditions, and various investigations were conducted. characteristic. That is, it is as follows.

[0065] [Inventive Example 3] The same conditions as those in Inventive Example 1.

[0066] [Inventive Example 4] The same conditions as those in Inventive Example 2.

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Abstract

Shot material for mechanical plating is provided, comprising steel core particles clad with an alloy comprising 1 to 5% by weight of aluminum, 3 to 15% by weight of magnesium, preferably 5 to 15% by weight of magnesium, and the balance of zinc and unavoidable impurities. The alloy may contain a total of 1% by weight of impurities. An Fe-Zn alloy layer may be provided between the alloy cladding and the steel core. The shot material may contain 3 to 80% by weight of iron. The preferable average diameter of the shot particles is 100 to 600 mum.

Description

Technical field [0001] The present invention relates to a projection material used in mechanical plating for forming a high corrosion resistance film on the surface of a metal material and a high corrosion resistance film formed using the projection material. Background technique [0002] As a method for improving the corrosion resistance of iron-based metal materials, techniques for forming zinc or zinc alloy coatings (hereinafter referred to as "zinc-based coatings") are widely used. Specifically, hot-dip plating, phosphate plating, electroplating, Technologies such as mechanical spraying are being put into practical use in industry. [0003] If a material that has formed a general zinc-based coating film such as galvanizing is exposed to the atmosphere as it is, white rust of zinc occurs in a relatively short period of time, which tends to accelerate the consumption of the coating film. Especially in the outdoor environment is remarkable. Therefore, a treatment (for example, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C30/00B22F1/00
CPCY10T428/12799Y10T428/12181C23C24/04B24C11/00B22F1/16
Inventor 长崎武明重岁雅司
Owner DOWA ELECTRONICS MATERIALS CO LTD
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