C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/78 (2006.01) C23C 22/73 (2006.01)
Patent
CA 1225310
ABSTRACT OF THE DISCLOSURE In a process for phosphating composite metals containing steel and zinc surfaces using phosphating solutions based on zinc phosphate by the dipping process, in order to achieve satisfactory formation of the phosphate layer, the composite metals are subjected, to preliminary dipping for a maximum of 30 seconds in a phosphating solution based on zinc phosphate in order to initiate the formation of the phosphate layer, and are then conveyed to the main dip-phosphating zone. It is advantageous to spray the composite metals with a phosphating solution based on zinc phosphate while they are being conveyed from the preliminary to the main dip-phos- phating zone, and it is advisable to limit the duration of the conveying and thus of the spraying treatment to a maximum of 30 seconds.
452666
Jorns Peter
Luckhardt Gunther
Meyer Norbert
Rausch Werner
Rothkegel Josef
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Parker Chemical Company
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