Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1993-06-25
1995-03-21
Silverberg, Sam
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
427321, 427433, C23C 200
Patent
active
053992113
ABSTRACT:
Upon forming a plating coat on steel works, the works are held in a fluorine- or fluoride-containing gas atmosphere in a heated condition to thereby remove oxidized scales such as SiOx, MnOx and the like on the surface layer of the work and to form a fluoride layer to prevent forming new oxidized scale. The fluoride layer is easily eliminated by an action of added flux to a plating bath or by heating the fluorinated steel works in an atmosphere containing hydrogen prior to dipping in the plating bath to activate the steel surface. The activated steel surface is improved in compatibility with the plating bath and the like to realize a good quality plating coat formation.
REFERENCES:
patent: 2121412 (1938-06-01), Schulte
patent: 3129124 (1964-04-01), Barney
patent: 3765929 (1973-10-01), Martin
patent: 4975147 (1990-12-01), Tahara
Kitano Kenzo
Senbokuya Haruo
Tahara Masaaki
Tomoda Takakazu
Yoshino Akira
Daidousanso Co. Ltd.
Silverberg Sam
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