Electrochemical properties of thermal-sprayed aluminum coatings were measured to determine the performance of this coating as a sacrificial anode for steel in seawater. Test environments included a salt-fog chamber and immersion in flowing ASTM seawater. In the immersion test, holidays (8 percent of the area) were machined into half of the samples and the other samples were electrically connected to steel coupons of comparable surface area. Potentials were monitored for 18 months and remain protective. Coulometric tests showed that the current capacity of an applied flame-sprayed aluminum coating was 3.6 amp hours per cubic centimeter. These data indicate that if properly applied, a thermal-sprayed aluminum coating will provide adequate cathodic protection to steel.

Subject
Holidays, Electric current, Coating performance, Steel surfaces, Coatings, Cathodic protection, Aluminum, Steel coupons, Seawater, Steel, Electric potential, Aluminum coatings, Immersion
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1984
Association for Materials Protection and Performance (AMPP)
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