STP646

    Atmospheric Corrosion Behavior of Aluminum-Zinc Alloy-Coated Steel

    Published: Jan 1978


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    Abstract

    The influence of the aluminum content of hot-dip aluminum-zinc alloy coatings on their corrosion behavior was studied by means of salt-spray and atmospheric corrosion tests. The objective was to develop an improved aluminum-zinc alloy coating on steel that would be more durable than galvanized coatings and that would be more protective to cut edges and areas of mechanical damage than hot-dip aluminum coatings. The optimum alloy was found to be 55 weight percent aluminum-zinc. This new alloy coating is two to four times as corrosion-resistant as a galvanized coating of similar thickness. Furthermore, for the galvanic protection of cut edges of sheet in some environments, this coating proved to be superior to aluminum coatings.

    Keywords:

    coatings, hot-dip coating, zinc-containing alloys, aluminum-containing alloys, atmospheric corrosion, salt-spray tests, zinc-aluminum alloys


    Author Information:

    Zoccola, JC
    Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

    Townsend, HE
    Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

    Borzillo, AR
    Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa

    Horton, JB
    Corrosion mechanisms engineer, corrosion mechanisms supervisor, hot-dip coatings supervisor, and corrosion prevention and coatings manager, Bethlehem Steel Corp., Bethlehem, Pa


    Paper ID: STP27323S

    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP27323S


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