METAL-COATED STEEL STRIP

摘要

An Al-Zn-Si-Mg alloy coated strip that has Mg 2 Si particles in the coating microstructure is disclosed. The 5 distribution of Mg 2 Si particles is such that a surface region of the coating has only a small proportion of Mg 2 Si particles or is at least substantially free of any Mg 2 Si particles. 5890523_1 (GHMatters) P77207.AU.2 PETAK 24/10/14 Strontium-free Strontium addition Figure 1 Sr additions in a 55%AI-Zn-1.5%Si-2.O%Mg coating eliminate the surface mottling defect and change the distribution pattern of the Mg2Si phase in the coating thickness direction. mammimnam