Effect of Nb on the Corrosion Resistance of Ferritic Stainless Steels in Molten Aluminum
The effect of Nb content on the corrosion resistance of ferritic stainless steel to aluminum liquid corrosion and the related mechanism were investigated.Different contents of Nb elements have an effect on the distribution of the second phase in the specimen matrix,and these second phases have the effect of hindering the corrosion of aluminum liquid.After etching of the ferritic stainless steel in aluminum liquid,an intermetallic compound layer will be generated at the interface,and the Nb element content in the matrix will affect the carbide generation and aggregation position,leading to the difference in corrosion resistance to aluminum liquid.The experimental results show that adding 0.2 wt.％of Nb element can obtain fine and dispersed second phase,and finally obtain excellent corrosion resistance in molten aluminum.
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