Bright tin plated steel plate having excellent paint adhesion

Abstract

Abstract PURPOSE:To permit production of a bright tin plated steel plate having excellent paint adhesion and high temp. water resistance by carrying out Ni plating on the surface of a tin plated steel plate then plating a metallic Cr layer and a Cr hydroxide layer further thereon. CONSTITUTION:After a cold rolled steel plate for plating is defatted and washed, tin electroplating is carried out on both surfaces thereof at 1.12-11.3g/ m<2> quantity. The steel plate is heated to temp. higher than the melting temp. of tin to melt the tin and to apply a brightening treatment; thereafter, Ni plating is carried out on the surfaces thereof at 1-20mg/m<2> quantity. Further an electrolytic chromic acid treatment is applied thereon and 10-100mg/m<2> a metallic Cr layer and 5-30mg/m<2> a Cr hydroxide layer as Cr are formed thereon. Since the Cr layer and the Cr hydroxide layer are formed by interposing the Ni layer on the Sn layer, the exfoliation of the Cr layer on the surface of the Sn layer is eliminated by the increased adhesion between the Sn layer and the Ni layer as well as between the Ni layer and the Cr layer, and the tin plated steel plate for canning having high paint adhesion and high temp. water resistance is obtained.

Inventors

• 👤 Tadashi Nemoto
• 👤 根本　忠志
• 👤 Nobuyuki Yoshimoto
• 👤 好本　信行
• 👤 Tsuneo Inui
• 👤 乾　恒夫
• 👤 Yoshikazu Kondo
• 👤 近藤　嘉一

Bibliographic Details