Chromate-free coated steel sheet with excellent appearance after press forming eco Frontier™ JE

JFE Steel developed a chromate-free galvanized steel sheet with excellent appearance after press forming, 'Eco Frontier™ JE' and has begun production and sales. Because only a very small amount of reaction accelerant is used in the JE coating, excellent surface appearance after press forming can be maintained, and the problems of blackening and spotting can be avoided. In comparison with conventional material with the same coating weight, the corrosion resistance of JE is greatly improved by forming a composite inorganic polymer coating containing silica, and securing a certain degree of adhesiveness by reaction with the Zn galvanized coating using the reaction accelerant composition. It is possible to secure the same level of corrosion resistance as that of the conventional material with JE with a thinner coating thickness.