Method of heat-treating a thin sheet coated with ZnAL by hot dip galvanization

US6231695A · kind A · utility

Assignee

• Thyssen Stahl AG · DE

Inventors

• Hans-Joachim Heiler · Moers, DE
• Wilhelm Warnecke · Hamminkeln, DE
• Wilhelm Durr · Dinslaken, DE
• Gunther Hobelheinrich · Lennestadt, DE

Key dates

• Filing date: Jun 2, 1999
• Grant date: May 15, 2001
• Expiry date: Jun 2, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2/29
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A thin sheet is coated by hot dip galvanization with a zinc based alloy comprising 3.5% to 15% by weight of aluminum. Immediately after solidification of the coating, the thin sheet is heated for 2 to 10 seconds to a temperature 20 to 100.degree. C. above the melting point of the coating. The thin sheet is then cooled to room temperature.