Method for applying a protective cover to a flat steel product and flat steel product with such a protective cover

摘要

Method for applying protective coating on flat steel product involves applying protective coating on a flat steel product at 400-490[deg] C in a zinc alloy molten bath containing aluminum component and a magnesium component and having bath temperature of 400-480[deg] C. The zinc alloy molten bath contains 1.8-3 wt.% aluminum, 1.3-2.7 wt.% magnesium, and remainder of zinc and unavoidable impurities. The content of aluminum is more than the content of magnesium. Method for applying protective coating on flat steel product involves applying protective coating on a flat steel product at 400-490[deg] C in a zinc alloy molten bath containing aluminum component and a magnesium component and having bath temperature of 400-480[deg] C. The zinc alloy molten bath contains 1.8-3 wt.% aluminum, 1.3-2.7 wt.% magnesium, and remainder of zinc and unavoidable impurities. The content of aluminum is more than the content of magnesium. The content of magnesium in the zinc alloy molten bath with respect to total content of aluminum and magnesium in the zinc alloy molten bath is 0:31-0:44. An independent claim is included for flat steel product, which comprises protective coating containing 1.8+- 0.2-3+- 0.2 wt.% aluminum, and 1.3+- 0.2-2.7+- 0.2 wt.% magnesium.