Method at treatment of metals

US6174383A · kind A · utility

Assignee

• EKA CHEMICALS AB · SE

Inventors

• Charlotte Angel · Göteborg, SE
• Troy Berglind · Torslanda, SE
• Arne Frestad · Göteborg, SE
• Sven-Eric Lunner · Avesta, SE
• Anders Waleij · Nordstraße, SE

Key dates

• Filing date: Jul 1, 1998
• Grant date: Jan 16, 2001
• Expiry date: Jul 1, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23G1/36
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a method at pickling of steel in an acidic aqueous pickling solution containing Fe.sup.3+ and Fe.sup.2+, wherein the steel is contacted with pickling solution that continuously is brought to circulate through a conduit into which hydrogen peroxide is supplied to oxidize Fe.sup.2+ to Fe.sup.3+.