Method for facilitating distinction between different steel prod

Details Method for facilitating distinction between different steel prod Method for facilitating distinction between different steel prod

1993-10-21

1995-01-10

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating selected area

205177, 205181, 205182, C25D 550

Patent

active

053804074

ABSTRACT:
Facilitating the distinction among different spring steel products and at the same time improving their surface appearance and corrosion resistance by plating the surface of said different spring steel products before spring-forming with either alternate layers of Cu and Zn or alternate layers of Ni, Cu and Zn, the amount of Cu and Zn differing for steel products differing in size and/or material, to obtain color-developable spring steel products, drawing and taken coil spring-forming the resulting plated spring steel products, and low temperature annealing said resulting plated spring steel products to develop their colors, the colors being different for spring steel products differing in size and/or material, whereby mixing and erroneous assembly of spring steel products differing in size and/or material is prevented.

REFERENCES:
patent: 3954420 (1976-05-01), Hyner et al.
patent: 3966183 (1976-06-01), Mayer, Sr.
patent: 4013488 (1977-03-01), Ramqvist et al.
patent: 4417956 (1983-11-01), McCoy
patent: 4791025 (1988-12-01), Hiromori et al.
patent: 4859289 (1989-08-01), Nishimura et al.

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