Effect of alloy element on mechanical and corrosion resistance properties of weathering steel deposited metal

The influence of Ni, Cr and Cu on mechanical and corrosion resistance properties of high-strength weathering steel deposited metal was investigated by using cycle immersion corrosion test, metallographic analysis, rust layer analysis and electrochemical test. The results show that Ni element can improve the –40 ℃ impact toughness of deposited metal by increasing the acicular ferrite content. On the contrary, Cr reduced the –40 ℃ impact toughness. Ni, Cr and Cu can increase the density and resistance of rust layer, and reduce self-etching current density of rust layer. Cu contributed to corrosion resistance of deposited metal in early and late corrosion time. The effect of Cr improving corrosion resistance was not better than that of Cr and Cu in the early corrosion time. However Cr can improve corrosion resistance of rust layer obviously in late corrosion time.