C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/02 (2006.01) C23C 2/00 (2006.01) C23C 2/06 (2006.01) C23C 2/26 (2006.01) C23C 28/00 (2006.01)
Patent
CA 2470042
A method for manufacturing a galvannealed steel sheet including hot dip galvanizing a steel sheet; heating the hot dip galvanized steel sheet to alloy the coating layer; temper rolling the galvannealed steel sheet; contacting the temper-rolled steel sheet with an acidic solution, and then allowing the temper-rolled steel sheet to stand for about 1 to about 30 second(s)to form an oxide layer on the surface of the temper-rolled steel sheet; and washing the temper-rolled steel sheet, on which the oxide layer is formed, with water. The acidic solution has a pH-buffering action and contains Fe ion.
Gamou Akira
Miyakawa Yoichi
Sugimoto Yoshiharu
Taira Shoichiro
Jfe Steel Corporation
Moffat & Co.
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