Corrosion of silicon carbide ceramics using conventional and electrochemical methods

S.G. Cook, J.A. Little, J.E. King

    Research output: Contribution to journalArticle

    Abstract

    Silicon carbide ceramics are candidate materials for use in aggressive environments, including those where aqueous acids are present. Standard corrosion testing methods such as immersion testing are not always sufficiently sensitive for these ceramics owing to the very low, almost unobservable, corrosion rates encountered. Using electrochemical methods the corrosion processes can be assisted, leading to higher rates and thus the elucidation of reaction mechanisms. The behaviour of a sintered and a reaction bonded silicon carbide has been investigated in aqueous HCl, HF, HNO3, and H2SO4, using standard immersion and new electrochemical methods. Both materials were passive in HCl, HNO3, and H2SO4 because of the formation of a surface silica film, and were active in HF. In HF, corrosion of sintered silicon carbide was slight and the residual silicon was removed from reaction bonded specimens.
    Original languageEnglish
    Pages (from-to)183-189
    Number of pages7
    JournalBritish Corrosion Journal
    Volume29
    Issue number3
    DOIs
    Publication statusPublished - Dec 1994

    Keywords

    • acid resistance
    • ceramic materials
    • electrochemical corrosion
    • hydrochloric acid
    • materials testing
    • nitric acid
    • reaction kinetics
    • sintering
    • sulfuric acid
    • ceramic corrosion
    • immersion testing
    • reaction bonded silicon carbide
    • silicon carbide

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