STP841

    Detrimental Materials at the Steel/Paint Interface

    Published: Jan 1984


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    Abstract

    Materials harmful to paint life can remain on the surface of steel not only after hand cleaning but also after the more thorough white metal blast cleaning. Harmful materials that can interfere with protection by paint include grease and oil, moisture, iron oxides, and chemical contaminants. Chemical contaminants come from acid rain, snow removal salts, seawater, nearby chemical plants, or contaminated blasting abrasives.

    These materials are discussed with emphasis on significant and novel concepts and with respect to occurrence, identification, removal, and the role of the material in causing corrosion. Experimental evidence and handbook data are used to support conclusions.

    Keywords:

    cell, chlorides, concentration, conductivity, contamination, corrosion, electrolyte, grease, inorganic salts, interface, ions, mill scale, osmosis, osmotic pressure, paints, primer (coatings), scale (corrosion), steel surface, sulfates, vapor pressure


    Author Information:

    Johnson, WC
    Staff, KTA-TATOR Inc., Pittsburgh, PA


    Paper ID: STP29524S

    Committee/Subcommittee: D01.21

    DOI: 10.1520/STP29524S


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