C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.2
C25D 11/02 (2006.01) C23C 22/78 (2006.01) C25D 5/02 (2006.01) C25D 7/06 (2006.01) C25D 11/34 (2006.01) C25F 1/00 (2006.01) C25F 1/06 (2006.01) B21B 1/22 (2006.01) B21B 45/06 (2006.01)
Patent
CA 1243268
- 26 - PROCESS FOR PRODUCING COLD ROLLED STEEL STRIP HIGHLY SUSCEPTIBLE TO CONVERSION TREATMENT ABSTRACT OF THE DISCLOSURE A cold rolled steel strip having an excellent conversion coating property is produced by a process comprising: anodic electrolytically treating at least one non-plated surface of a cold rolled steel strip to form a layer of oxides thereon, and cathodic electrolytically treating the above- mentioned surface to remove a portion of the oxide layer to an extent that the remaining portion of the oxide layer is in an amount corresponding to a quantity of electricity of from 0.05 to 4.0 millicoulomb/cm2 which is necessary to completely remove the remaining portion of the oxide layer by means of a cathodic electrolytic treatment in an aqueous solution containing 19.06 g/l of borax and having a pH of 6.4 at a constant current density of 5 microampere/cm2 and is in the form of a number of separate dots corresponding to a natural reduction time of from 1.0 to 200 seconds.
459003
Hirano Yoshihiko
Odashima Hisao
Saito Takao
Goudreau Gage Dubuc
Nippon Steel Corporation
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