Research and Development > JFE TECHNICAL REPORT > JFE TECHNICAL REPORT No.18- Special Issue on "Steel Products for Energy Industries" and "Steel Sheets for Automotive and Electric Machinery and Appliance" > Development of Chromate-Free Coated Hot-Dip Galvanized Steel Sheet "Eco Frontier^TM JM"

No.18 April 2013 - Special Issue on "Steel Products for Energy Industries" and "Steel Sheets for Automotive and Electric Machinery and Appliance"

Development of Chromate-Free Coated Hot-Dip Galvanized Steel Sheet "Eco Frontier^TM JM"

FUJIBAYASHI Nobue       MATSUZAKI Akira       SUGIMOTO Yoshiharu

Abstract

At a site of heating, such as a brazing portion of a heat exchange unit, discoloration of chemical treatment layer on steel sheet may interfere with the use. "Eco Frontier^TM JM" is a new inorganic chromate-free coated hot-dip galvanized steel sheet, which is suitable for use at the part of heating due to low film discoloration or damage caused by the heat. Eco Frontier^TM JM shows high corrosion resistances after heating and bend section as well as a flat panel, because the inorganic layer has stronger adhesion capability by forming reaction products at the interface with a zinc coating layer. It also produces an excellent barrier effect by metal oxide to form an inorganic polymer and a self-healing effect by novel corrosion inhibitor. JM can be applied in various parts as an alternative to conventional chromate coated steel sheet.

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