Microstructure and corrosion resistance of plasma sprayed Fe-based alloy coating as an alternative to hard chromium

Wenhuan Lu, Yuping Wu, Jingjing Zhang, Sheng Hong, Jianfeng Zhang, Gaiye Li

    Research output: Contribution to journalReview articlepeer-review

    16 Citations (Scopus)

    Abstract

    Fe-based alloy coating (FAC) was prepared from Fe-based amorphous metallic powders on low-carbon steel by plasma spray. The microstructures and corrosion resistances (salt spray and electrochemical tests) of the FAC and the reference hard chromium coatings (HCC) were investigated. The results indicated that the as-sprayed FAC consisted of amorphous phase, nanocrystalline grains, and borides. Both the FAC and HCC adhered well to the low-carbon steel substrate, but there are micro-cracks and pores located in FAC, which disappeared after the sealing treatment. After 60 days (1440 h) of corrosion tests by salt spray, the weight loss of FAC was about 10% of the HCC, but that of the sealed FAC (SFAC) was only about 4% of HCC. The electrochemical tests indicated that the HCC had the lowest E corr (-629 mV) and highest I corr (63.2 mA/m 2). Correspondingly, the SFAC possessed the highest E corr (-321 mV) and lowest I corr (6.97 mA/m 2). These suggested that the resistance to corrosion sequence (R) among these coatings was R SFAC > R FAC > R HCC. Therefore, this Fe-based alloy coating could be applied as a good alternative material to hard chromium in corrosion environments.

    Original languageEnglish
    Pages (from-to)1063-1070
    Number of pages8
    JournalJournal of Thermal Spray Technology
    Volume20
    Issue number5
    DOIs
    Publication statusPublished - 2011 Sep

    Keywords

    • electrochemical corrosion test
    • hard chromium coating
    • plasma spray
    • salt spray test

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces, Coatings and Films
    • Materials Chemistry

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