Effect of W on microstructure and zinc corrosion resistance of Co-based alloy cladding layers
ZHANG Song
HE Si-wen
GUAN Meng
CUI Wen-dong
TAN Jun-zhe
Abstract：In order to improve the service life of key components in the hot dip galvanizing production line and save the cost of hot dip galvanizing, two Co-based alloy cladding layers with different compositions were prepared on the surface of 316L stainless steel with the semiconductor laser. The microstructural morphology, composition, phase structure, microhardness and zinc corrosion resistance of laser cladding layers were studied, respectively. The results show that the addition of W element makes the grains of cladding layer refine. The microstructure of laser cladding layer is mainly composed of γ-Co solid solution, Co3 Mo2 Si and Cr7 C3 phases. Meanwhile, a small amount of Co6 W6 C phase forms. The average hardness of cladding layer reaches 986 HV, which is 114 HV higher than that of Co-based alloy cladding layer without the W element, and is about 4. 5 times as that of 316L stainless steel. Compared with the orginal Co-based alloy cladding layer, the Co6 W6 C phase sparsely distributes in the Co-based alloy cladding layer with W element, which significantly improves the zinc corrosion resistance of cladding layer.
Keywords：hot dip galvanizingCo-based alloy cladding layermicrostructurecompositionphase structuregrain refinementmicrohardnesszinc corrosion resistance
Publication Date：2017-09-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 491-495 )