The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2003
Filed:
Jun. 25, 2001
Applicant:
Inventors:
Alain Bello, Hettange-Grande, FR;
Sylviane Wajda, Hayange, FR;
Jacques Petitjean, Thionville, FR;
Armand Rossi, Fameck, FR;
Assignee:
Sollac, Puteaux, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 1/504 ; C23C 2/253 ; C25D 1/134 ;
U.S. Cl.
CPC ...
B32B 1/504 ; C23C 2/253 ; C25D 1/134 ;
Abstract
The invention concerns a steel plate coated with a metal layer based on zinc and a zinc hydroxysulphate layer, whereof the surface density of sulphur is more than 0.5 mg/m . The invention also concerns a method for obtaining said plate by treating a zinc coated sheet metal: either in a highly alkaline sulphate solution under polarization; or in a sulphate solution containing Zn ions without polarization. The hydroxysulphate deposit brings about a pre-lubricating effect applicable to operations for forming sheet metal.