Cavitation Erosion Behavior and Mechanism of HVOF Sprayed WC-10Co-4Cr Coating in 3.5 wt% NaCl Solution

Sheng Hong, Yuping Wu, Jianfeng Zhang, Yugui Zheng, Yujiao Qin, Wenwen Gao, Gaiye Li

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)

    Abstract

    A WC-10Co-4Cr coating was prepared by high-velocity oxygen-fuel (HVOF) thermal spraying process. The cavitation erosion (CE) characteristics of the coating as well as the stainless steel 1Cr18Ni9Ti were investigated in 3.5 wt% NaCl solution. The coating exhibited higher CE resistance than that of the stainless steel 1Cr18Ni9Ti. After being eroded for 20 h, the CE volume loss of the stainless steel 1Cr18Ni9Ti is 3.22 times to that of the coating. The removal mechanism for the coating was erosion of the binder phase first, followed by brittle detachment of hard phases as a result of the action of corrosion and mechanical effect. The cracks were found to initiate at the carbide-binder interface and the edge of the pores, leading to craters on the surface and accelerating the damage of the coating. Fatigue and plastic deformation were found to be the material removal mechanism for the substrate steel 1Cr18Ni9Ti.

    Original languageEnglish
    Pages (from-to)151-159
    Number of pages9
    JournalTransactions of the Indian Institute of Metals
    Volume68
    Issue number1
    DOIs
    Publication statusPublished - 2014 Feb

    Keywords

    • Cavitation
    • Coating
    • HVOF
    • WC-10Co-4Cr

    ASJC Scopus subject areas

    • Metals and Alloys

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