Journal
SURFACE & COATINGS TECHNOLOGY
Volume 425, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127684
Keywords
Laser cladding; 316L SS coating; Microstructure; Microhardness; Corrosion resistance
Funding
- Natural Science Foundation of Shandong Province [ZR2020ME015]
- Distinguished Taishan Scholars in Climbing Plan [tspd20161006]
- Major-Special Science and Technology Projects in Shandong Province [2019JZZY010303, 2019JZZY010360]
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316L SS coatings with different Nb content (0.2, 0.5, 1.0, 3.0, 5.0, 7.0 wt%) were fabricated on Q235 steel plate by laser cladding. The addition of Nb changed the phase structure of 316L and increased the microhardness of the coating. Nb 1.0 coating showed the best corrosion resistance, while excessive Nb led to decreased corrosion resistance.
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.
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