Influence of MoSi₂ Addition in Co Based Alloy Cladding Coating on Microstructure Evolution and Pitting Corrosion Behaviour

Abstract:

In the present paper the influence of the addition of MoSi₂ particles on the microstructure and pitting corrosion behaviour of laser cladding Co based alloy coatings deposited on 304 stainless steel substrate has been reported. The coating microstructure was investigated by SEM, OM, XRD and EPMA etc.. And the pitting corrosion resistance of coating was evaluated in the 3.5% NaCl solution. The results showed that: (1) The microstructure is fined by increasing MoSi₂ percentage. And the coating microstructure evolved from dendrites and interdendritic eutectics to various faceted dendrites with the bamboo leaf, flower, or butterfly morphology, when the MoSi₂ content is from 0~20% to 30~40%; (2) the (E_pit-E_prot) of Co based alloy/MoSi₂ composite coating was lower than that of Co based alloy, and which presented higher self-repairing capability. The pitting potential E_pit of Co +(0~20wt.%) MoSi₂ cladding coatings is higher than that of stainless steel, the pitting corrosion resistance is enhanced; When more MoSi₂ (30wt.%) was added, the pitting corrosion resistance decreases due to microstructure inhomogeneity and exiting of inclusion.

• Periodical: Applied Mechanics and Materials (Volume 456)
• Pages: 392-398
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.456.392
• Online since: October 2013
• Authors: Ze Fen Liang, Min Zheng
• Keywords: Co-Based Alloy, Laser Cladding, Microstructure, MoSi₂, Pitting Corrosion Resistance

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