STP93: Comparative Corrosion Resistance of Stainless Steels in Various Acids

    Mears, R B
    Manager and members of the Technical Staff, respectively, Research Laboratory, Carnegie-Illinois Steel Corp., Pittsburgh, Pa.

    Larrabee, C P
    Manager and members of the Technical Staff, respectively, Research Laboratory, Carnegie-Illinois Steel Corp., Pittsburgh, Pa.

    Fetner, C J
    Manager and members of the Technical Staff, respectively, Research Laboratory, Carnegie-Illinois Steel Corp., Pittsburgh, Pa.

    Pages: 9    Published: Jan 1950


    Abstract

    The corrosion resistances of several grades of austenitic stainless steels were determined in the boiling nitric acid test (Huey test) and compared with the corrosion resistances of these same steels in sulfuric acid solutions. Steels showing the least corrosion resistance in the nitric acid test generally proved to be the most resistant to sulfuric acid. Specimens of types 304 and 316 stainless steel in both the annealed and sensitized conditions also were exposed to the boiling nitric acid test and to boiling solutions of lactic, phosphoric, and acetic acids. The type 316 steel proved to be less resistant to nitric acid, but in most cases was definitely more resistant to the other boiling acids than the type 304 steel. However, microscopic examination indicated that the types of attack which developed in the annealed or sensitized types 304 and 316 specimens in the boiling nitric acid test were qualitatively similar to the types of attack which developed in similar specimens in the other boiling acids, provided any attack developed.


    Paper ID: STP43971S

    Committee/Subcommittee: A01.14

    DOI: 10.1520/STP43971S


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