STP1000

    The Nondestructive Characterization of Corrosion

    Published: Jan 1990


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    Abstract

    Recent advances in nondestructive evaluation (NDE) technology have led to improved methods for quality control and in-service inspection. In addition, these same advancements have led to the development of new options for material diagnostics. No longer are NDE considerations directed only at crack detection and sizing. Detailed discontinuity characterization has become a major objective of much NDE work underway today. Specifically, this work is aimed at the creation of quantitative NDE methods which offer a rational alternative to destructive metallography for material evaluation. While this goal may be some ways off, significant progress has been made in the NDE characterization of corrosion-induced degradation. Nowhere have these developments been more evident than in the characterization of corrosion phenomena in small-diameter, heat exchanger tubing. This paper presents results from a continuing program designed to establish improved inspection methods for the assessment of corrosion degradation in nickel-alloy nuclear steam generator tubing. The major focus is directed at unique test methods and data analysis techniques which offer the potential to identify and discriminate between different kinds of corrosion degradation. While the results highlight success in the assessment of tubing, the concepts and general observations are equally applicable to other components.

    Keywords:

    tubing, degradation, eddy current, ultrasonic, corrosion, inspection, visual, nondestructive, steam, generator, diagnostics


    Author Information:

    Clark, WG
    Materials Reliability, Westinghouse Science & Technology Center, Pittsburgh, PA

    Metala, MJ
    Materials Reliability, Westinghouse Science & Technology Center, Pittsburgh, PA


    Paper ID: STP39179S

    Committee/Subcommittee: G01.12

    DOI: 10.1520/STP39179S


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