Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1989-06-21
1990-11-20
Woo, Jay H.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148258, 148267, 148268, C23C 2224, C23C 2282
Patent
active
049716360
ABSTRACT:
A method of producing highly corrosion-resistant surface-treated steel plates where Cr elusion is small in spite of drying at low temperatures and corrosion resistance is excellent. In a process for producing surface treated steels where Zn type plated steels are treated through (i) chromate treatment, (ii) coating a resin composition and (iii) baking treatment, zirconium fluoride ion and Zn ion of appropriate amounts are added into the chromate bath, and Cr.sup.6+ /Cr.sup.3+ ratio in the bath is controlled to be low. Further the resin composition to be coated after the chromate treatment is rendered a solvent type resin composition obtained by adding silica and/or sparingly water soluble Cr compound to basic epoxy resin.
REFERENCES:
patent: 2851385 (1958-09-01), Spruance
patent: 4098620 (1978-07-01), Sato
patent: 4146410 (1979-03-01), Reinhold
patent: 4157924 (1979-06-01), Elms
patent: 4647316 (1987-03-01), Prescott
Kuboto Takahiro
Watanabe Tsutomu
Yamashita Masaaki
Durkin, II. Jeremiah F.
Nields Henry C.
NKK Corporation
Woo Jay H.
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