C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/25.5
C25D 11/38 (2006.01)
Patent
CA 1063546
ABSTRACT OF THE DISCLOSURE An improvement is provided in a conventional electrolytic chromating procedure. A steel sheet is first subjected to a cathodic electrolytic chromate treatment in an electrolytic chromating bath, at a relatively high speed of 400 to 1,000m per minute, to form substantially simultaneously, a lower layer of metallic chromium and an upper layer of hydrated chromium oxides on the surface of said steel sheet, in which the initial amount of the hydrated chromium oxide layer exceeds 0.4 mg/dm2 expressed as chromium, and the amount of the hydrated chromium oxide layer is then adjusted within a desired range. The improvement comprises the steps of subjecting a steel sheet to a cathodic electrolytic chromate treatment at a relatively high speed of 400 to 1,000m per minute in a conventional electrolytic chromating bath, to form substantially simultaneously, a lower layer of metallic chromium and an upper layer of hydrated chromium oxides on the surface of said steel sheet; and then, subjecting said electrolytically chromated steel sheet to an anodic electrolytic treatment under the following conditions in said electrolytic chromating bath, to adjust the amount of said hydrated chromium oxide layer within the range from 0.1 to 0.3 mg/dm2, expressed as chromium: Bath temperature : room temp. - 70°C, Anodic current density : 0.5 - 8A/dm2, Treating time : 0.5 - 2 sec., Amount of electricity : 1 - 8 Coulomb/dm2. By this procedure, the thickness of the hydrated chromium oxide layer may be adjusted at will.
244548
Kashiyama Yoshitaka
Takano Hiroshi
LandOfFree
Process for manufacturing electrolytically chromated steel... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for manufacturing electrolytically chromated steel..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for manufacturing electrolytically chromated steel... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-355332