C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22
C25D 3/22 (2006.01) B32B 15/18 (2006.01) C25D 5/10 (2006.01)
Patent
CA 1077428
ABSTRACT OF THE DISCLOSURE A steel sheet is subjected to a first electro-galvanizing treatment in an acidic galvanizing bath containing either zinc, or zinc and cobalt, or zinc and either Cr+3, or Cr+6, or Cr+3 and Cr+6, or Zr under conventional galvanizing conditions to form on the surface of the steel sheet a first galvanizing layer excellent in the bare corrosion resistance. The electro-galvanized steel sheet with the first galvanizing layer formed thereon is subjected to a second electro-galvanizing treatment under conventional galvanizing conditions in a Zn-based acidic galvanizing bath containing at least one of the particularly specified additives (but excluding Co) to form on the first galvanizing layer a second galvanizing layer of an amount of at least 0.2 g/m2 excellent in the adaptability to chromating. The galvanized steel sheet with the first and the second galvanizing layers formed thereon is subjected to a conventional chromate treatment to form on the second galvanizing layer a chromate film. In this way, a chromated electro-galvanized steel sheet is obtained which is excellent in bare corrosion resistance of the galvanizing layer and corrosion resistance of the chromate film and which has a deposited chromate film in all amount sufficient to minimize degradation of the deep-drawing formability caused by secular change.
248525
Adaniya Takeshi
Ohmura Masaru
LandOfFree
Chromated electro-galvanized steel sheet excellent in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chromated electro-galvanized steel sheet excellent in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromated electro-galvanized steel sheet excellent in... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-977718