STP1385

    Salt Spray Performance Evaluation: Proposed Image-Analysis-Based Test Method

    Published: Jan 2000


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    Abstract

    ASTM Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments (D 1654-92) is the current industry standard. This standard assigns a number, from 0 to 10, to reflect the width of the paint delaminated as measured from a scribe line to the creepage front. At times when the width along the scribe is not uniform, it is difficult to apply this standard. The difficulty lies in the fact that the standard is attempting to describe a two-dimensional pattern with a linear parameter. A two-dimensional parameter should be more suitable, and delaminated area seemed to be an obvious choice. Image analysis is a powerful tool to aid in the evaluation of the proposed parameter. The results using percentage area correlate well and linearly with D 1654 ratings. Effects of scribe length, paint color, reproducibility, and operator-to-operator variance are also discussed.

    Keywords:

    corrosion, D 1654-92, salt fog, salt spray, B117, accelerated weathering, image analysis


    Author Information:

    Warburton, YJ
    Research Associate and Research Fellow, Technology Group, Calgon Corporation, Pittsburgh, PA

    Gibbon, DL
    Research Associate and Research Fellow, Technology Group, Calgon Corporation, Pittsburgh, PA


    Paper ID: STP12470S

    Committee/Subcommittee: G03.01

    DOI: 10.1520/STP12470S


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