Hot dip coated steel sheet and process for producing the same

Abstract From the Canadian patent

Abstract, Disclosed is a hot dip coated steel sheet obtained by hot dipping a steel sheet in a hot-dip metal bath comprising zinc-based or zinc/aluminum based alloy and a, process for producing the same. The hot dip coated steel sheet has a film of oxides which are compounds of cobalt or iron, or both of these with oxygen, and the film can prevent the hot dip coated steel sheet from undergoing color change into grayish black in the case where spangles are minimized where a, coating contains corrosion resistance-improving elements such as magnesium and aluminum, or where a chromate treatment is applied after the mechanical processings were carried out. Formation of oxide film on the surface …