Abstract
316L SS with different Nb content (0.2, 0.5, 1.0, 3.0, 5.0, 7.0 wt%) coatings were fabricated on Q235 steel plate by laser cladding. The addition of Nb made the phase structure of 316L change from FCC to FCC + BCC + Laves phase . With the Nb content increasing, the microhardness of 316L coating increased gradually. The Nb7.0 coating is about 2.0 times as hardness of the substrate. Electrochemical testing showed that Nb 1.0 coating had the best corrosion resistance in 3.5 wt% NaCl solution. Excess Nb will cause corrosion to occur more easily and decrease the corrosion resistance of the coating. • The compact 316L SS with dissimilar Nb alloy coating was prepared by laser cladding. • The Nb1.0 coating has good corrosion resistance in 3.5 wt% NaCl solution. • Niobium oxide played an important role in improving the corrosion resistance of passive film, but excessive niobium will have adverse effects on the structure. • The Nb7.0 coating has high microhardness.
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