FUJIBAYASHI Nobue MATSUZAKI Akira SUGIMOTO Yoshiharu
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 FrontierTM 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 FrontierTM 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.