Title: Surface treated steel strip having improved weldability and process for making
Application Number: 85109305 Application Date: 1985.11.28
Publication Number: 1002161 Publication Date: 1986.08.06
Approval Pub. Date: 1990.10.24 Granted Pub. Date: 1990.10.24
International Classifi-cation: B32B15/18;C25D3/30;C25D5/12;C25D11/38
Applicant(s) Name: Kawasaki Steel Corp. Address:
Inventor(s) Name: Hisatada Nakakouji;Kazuo Mochizuki;Toshio Ichida
Attorney & Agent: YANG KAI
Abstract:
    A surface-treated steel strip having improved weldability is provided, comprising a metallic Cr layer deposited on a steel strip, a metallic Sn layer deposited on the chromium layer, and a chromate coating layer deposited on the Sn layer and consisting 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, rinsing the Sn-deposited strip, and subjecting the strip to chromate treatment in a chromate bath and sulfuric acid, a sulfate or fluoride at a current density of at least 10 A/dm
Time: 3