Al-based alloy plated steel material having excellent post-coating corrosion resistance
View Patent ↗An Al-based alloy plated steel material includes: a steel material and a coating layer formed on a surface of the steel material, wherein the coating layer includes an Al-based alloy plating layer containing, in mass %, not less than 10% nor more than 50% Fe and not less than 3% nor more than 15% Si, and formed on the surface of the steel material; a layer containing ZnO and formed above a surface of the Al alloy plating layer; and a ZnAl 2 O 4 layer with a thickness of not less than 0.05 μm nor more than 2 μm, formed between the Al alloy plating layer and the layer containing ZnO.
1. An Al-based alloy plated steel material having excellent post-coating corrosion resistance, the Al-based alloy plated steel material comprising:
a steel material and a coating layer formed on a surface of the steel material,
the coating layer comprising:
an Al-based alloy plating layer;
a ZnAl 2 O 4 layer formed directly on the Al-based alloy plating layer; and
a layer containing ZnO, formed directly on the ZnAl 2 O 4 layer, and located in an uppermost surface,
wherein the Al-based alloy plating layer contains, in mass %, not less than 10% nor more than 50% Fe and not less than 3% nor more than 15% Si, and
wherein the ZnAl 2 O 4 layer has a thickness of not less than 0.05 μm nor more than 2 μm.
2. The Al-based alloy plated steel material having excellent post-coating corrosion resistance according to claim 1 , wherein a surface roughness Ra of the coating layer is within a range of not less than 1 μm nor more than 5 μm.