Abstract: This invention relates to an aluminum-zinc alloy coated ferrous base product which exhibits improved atmospheric corrosion resistance, and to the process whereby such improved corrosion resistance may be realized. The process is characterized by the steps of heating such coated product to a temperature within the single phase region for the composition corresponding to the aluminum and zinc of said coating, defined as .alpha. in the FIGURE in the accompanying drawing, preferably at a temperature between about 650.degree. F. (343.degree. C.) to 750.degree. F. (399.degree. C.), for a period of time to solution treat the aluminum-zinc alloy coating overlay, and cooling slowly to at least 350.degree. F. (177.degree. C.).

Abstract: This invention relates to an aluminum-zinc alloy coated ferrous product whose coating is highly ductile, and to the method whereby such improved coating ductility may be realized. The process is characterized by the steps of thermally treating the aluminum-zinc alloy coated product by heating to a temperature between about 200.degree. F. (93.degree. C.) and 800.degree. F. (427.degree. C.) and holding for a period of time to effect metallurgical structure changes, among them being the precipitation of a second phase incoherent with the matrix, followed by slow cooling to at least 400.degree. F. (205.degree. C.). The resulting product is characterized by an aluminum-zinc alloy coating with a hardness no greater than about 115 VHN, and preferably no greater than about 110 VHN.

Abstract: This invention relates to an aluminum-zinc alloy coated ferrous product whose coating is highly ductile, and to the method whereby such improved coating ductility may be realized. The process is characterized by the steps of thermally treating the aluminum-zinc alloy coated product by heating to a temperature between about 200.degree. F. (93.degree. C.) and 800.degree. F. (427.degree. C.) and holding for a period of time to effect metallurgical structure changes, among them being the precipitation of a second phase incoherent with the matrix, followed by slow cooling to at least 400.degree. F. (205.degree. C.). The resulting product is characterized by an aluminum-zinc alloy coating with a hardness no greater than about 115 VHN, and preferably no greater than about 110 VHN.

Abstract: This invention relates to an aluminum-zinc alloy coated ferrous base product which exhibits improved atmospheric corrosion resistance, and to the process whereby such improved corrosion resistance may be realized. The process is characterized by the steps of heating such coated product to a temperature within the single phase region for the composition corresponding to the aluminum and zinc of said coating, defined as .alpha. in the FIGURE in the accompanying drawing, preferably at a temperature between about 650.degree. F. (343.degree. C.) to 750.degree. F. (399.degree. C.), for a period of time to solution treat the aluminum-zinc alloy coating overlay, and cooling slowly to at least 350.degree. F. (177.degree. C.).

Abstract: Large steel products such as structural sections, castings, forgings and machined sections are coated with a smooth, adherent, bright metallic coating comprised of 25 to 85% aluminum, silicon in an amount of 0.7% or more by weight of the amount of aluminum and the balance substantially zinc without the occurrence of detrimental exothermic reactions of the coating medium with the base metal.