High adhesion molten aluminum-zinc alloy plating process

Details High adhesion molten aluminum-zinc alloy plating process High adhesion molten aluminum-zinc alloy plating process

1990-12-12

1992-08-25

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Cooling

427406, 427431, 427433, C23C 200

Patent

active

051417812

ABSTRACT:
Methods of improving the thickness and characteristics of galvanizing processes are disclosed. Several methods are disclosed which promote growth of the .zeta. layer in a double dipping galvanizing process. In one process a metal article is dipped in a molten-zinc bath at 430.degree.-480.degree. C. The article is then air-cooled or semi-air-cooled before it is dipped in a molten zinc bath containing no less than 0.1% aluminum at 390.degree.-460.degree. C. In another method, after molten-zinc-plating a metal article at 480.degree.-500.degree. C., the article is plated in a molten zinc bath containing no less than 0.1% of aluminum at 390.degree.-460.degree. C. In a third method, the surface of a metal article is blasted to form a surface having a roughness of at least 20 .mu.m before plating the article in a molten-zinc bath at 430.degree.-480.degree. C. The article is then plated in a molten zinc bath containing no less than 0.1% of aluminum at 390.degree.-450.degree. C.

REFERENCES:
patent: 3758333 (1973-09-01), Herman
patent: 4059711 (1977-11-01), Mino
patent: 4216250 (1980-08-01), Nakayama
patent: 4801338 (1989-01-01), Quantin
patent: 5049453 (1991-09-01), Suemitsu
English translation of German Patent 2,146,376.
English translation of Japan Patent 13058.

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