C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/25.5
C25D 5/12 (2006.01) B32B 15/18 (2006.01) C25D 3/30 (2006.01) C25D 7/06 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1273600
ABSTRACT OF THE DISCLOSURE A surface-treated steel strip having improved weldability is provided, comprising a metallic Cr layer deposited on a steel strip to a weight of 50 to 150 mg/m2, a metallic Sn layer deposited on the chromium layer to a weight of 50 to 400 mg/m2, and a chromate coating layer deposited on the Sn layer and consisting essentially of 3 to 15 mg/m2 of metallic Cr and 3 to 15 mg/m2 of hydrated Cr oxide calculated as elemental Cr. The surface-treated steel strip is made by subjecting the cleaned surface of a steel strip to chromium electrodeposition, rinsing the Cr-deposited strip, subjecting the strip to tin electrodeposition in an acidic bath containing 1.5 to 10 grams per liter of Sn ion at a pH of lower than 0.5, rinsing the Sn-deposited strip, and subjecting the strip to chromate treatment in a chromate bath containing up to 50 grams per liter of CrO3 and sulfuric acid, a sulfate or fluoride at a current density of at least 10 A/dm2, thereby forming a chromate coating layer consisting essentially of metallic Cr and hydrated Cr oxide.
496616
Ichida Toshio
Mochizuki Kazuo
Nakakouji Hisatada
Kawasaki Steel Corporation
Moffat & Co.
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