Global Patent Index - EP 0996763 A1

EP 0996763 A1 2000-05-03 - GALVANIZING OF REACTIVE STEELS

Title (en)

GALVANIZING OF REACTIVE STEELS

Title (de)

FEUERVERZINKEN VON REAKTIONSFÄHIGEM STAHL

Title (fr)

GALVANISATION DES ACIERS REACTIFS

Publication

EP 0996763 A1 (EN)

Application

EP 98922555 A

Priority

  • CA 9800506 W
  • US 87016497 A

Abstract (en)

[origin: WO9855664A1] An alloy and a process for the galvanizing of steels containing silicon by an immersion galvanization process, the alloy comprising a zinc alloy of commercial purity having, by weight, aluminum in the amount of at least 0.001 %, tin in the amount of about 0.5 % to about 2 %, and one of vanadium in the amount of at least 0.02 %, preferably 0.05 % to 0.12 %, titanium in the amount of at least 0.03 %, preferably 0.06 % to 0.1 %, or vanadium with titanium in the amount of at least 0.02 % of vanadium and at least 0.01 % of titanium, for at least 0.03 %, preferably 0.05 % to 0.15, of vanadium and titanium collectively, the balance zinc containing up to 1.3 wt.% lead. This alloy can enhance zinc-nickel alloy baths containing a normal operating range of 0.05 % to 0.08 % nickel to a maximum of 0.1 % nickel. An embodiment of the allow composition for zinc-nickel alloy baths may contain vanadium with nickel in the amount of at least 0.02 % vanadium and at least 0.02 % nickel to a maximum of 0.15 % vanadium and nickel collectively. Titanium may be added in an amount of at least 0.01 % titanium to a maximum of 0.2 % vanadium, nickel and titanium. A further embodiment of the alloy composition for use in a zinc alloy bath is comprised of aluminum in the amount of at least 0.001 %, tin in the amount of about 0.5 % to about 2 %, vanadium in the amount of 0.02 % to 0.12 %, bismuth in the amount of 0.05 % to 0.5 %, preferably 0.05 % to 0.1 %, and the balance zinc. The process is suitable for galvanizing a wide range of steels including reactive steels. The maximum silicon level controlled varies from 0.5 % to 1 % depending on the combination and amounts of tin, vanadium and titanium in the alloy.

IPC 1-7 (main, further and additional classification)

C23C 2/06; C22C 18/00

IPC 8 full level (invention and additional information)

C22C 18/00 (2006.01); C23C 2/06 (2006.01)

CPC (invention and additional information)

C23C 2/06 (2013.01); C22C 18/00 (2013.01)

Citation (search report)

See references of WO 9855664A1

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IT LI NL PT SE

DOCDB simple family

WO 9855664 A1 19981210; AT 263850 T 20040415; AU 730209 B2 20010301; AU 7517198 A 19981221; CA 2293495 A1 19981210; CA 2293495 C 20060103; DE 69823032 D1 20040513; DE 69823032 T2 20050428; EP 0996763 A1 20000503; EP 0996763 B1 20040407; ES 2217555 T3 20041101