STP965

    Marine Salts Contribution to Atmospheric Corrosion

    Published: Jan 1987


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    Abstract

    The effects on atmospheric corrosivity of carriage of sea-salt inland from ocean coasts have been largely neglected by researchers except for regions within a few kilometers from the sea. In island nations, salt-affected zones can cover large percentages of total land area. The extent of carriage of sea-salt inland, and correlation to this of the corrosion rates of metals, is assessed in two areas of New Zealand. A sheltered surface collector is erected at each of 18 sites at up to 90 km inland. The site had been chosen to minimize the likelihood of industrial pollution. Each collection rack had attached to its top a test unit with an aluminum wire on a threaded stud (Climat test unit) and a rod holding a pair of steel coupons. There was very good correlation of the steel corrosion rate (48 weeks of exposure) to the log (chloride deposition), and to the 48-week average steel stud value in the 12-week Climat test. The Climat test, because of its ease of performance, thus seems to be a cost-effective means of assessing likely corrosion problems in purely marine environments. The results suggest that sea-salt mediated corrosion rates at distances 20 km and more inland are higher than might have been expected from published reports of studies on continental land masses.

    Keywords:

    aluminum, atmosphere, chlorides, corrosion, measuring, New Zealand, sea-salt, steel


    Author Information:

    Duncan, JR
    Head of Building Science Corp., and research assistant, Building Research Association of New Zealand, Private Bag, Porirua,

    Ballance, JA
    Head of Building Science Corp., and research assistant, Building Research Association of New Zealand, Private Bag, Porirua,


    Paper ID: STP25859S

    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP25859S


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