Full Description

This standard covers the requirements for both one and two side purezinc and zinc nickel alloyelectrogalvanized coatings. These coatings are applied to a sheetsteel substrate utilizing anelectroplating process. The substrate may be either cold or hot rolledlow carbon, rephosphorized,solid solution strengthened, bake-hardenable, high strength low alloyor dual phase steel.Additional requirements or agreements shall be specified by the localbusiness units (e.g., NAO,Opel ITDC, GM do Brazil, Holden Ltd., etc.)

Material Description. The type of coating and its mass and finish arespecified by suffixes addedto the basic specification number. The first two letters EG willdesignate an electrogalvanizedcoating. The coating mass for each side is designated by a minimumvalue in g/m². Only coatingmasses of 47 g/m², 60 g/m² or 70 g/m² for pure zinc,and 32 g/m² forzinc-nickel alloy should be used unless materials engineering isconsulted. Other coating massesshall follow the same designation method. For one side coated coils,or sheets/blanks the uncoatedside should be free of coating. A residue of 40 mg/m² max. ispermissible. The letter Gdesignates a pure zinc coating. The letter N designates a zinc-nickelalloy coating. The first setof digits along with the letter designation specifies the coatingparameters of the unexposed side.The remaining designation specifies E (exposed), or U (unexposed) todepict surface finish.