Interim Results on the Corrosion Behavior of Engineering Alloys in OzonatedArtificial Seawater

摘要

Initial testing of metal alloys in ozonated vs. aerated artificial seawater hasbeen completed for exposure times of up to 16 weeks. Five alloy groups were tested: nickel-based, stainless steel-based, titanium-based, aluminum-based, and copper-based. Three types of samples were used to evaluate corrosion behavior: weight loss, creviced and wire (electrochemical). Of the five alloy groups, titanium was the most resistant, showing little difference in the corrosion behavior between aerated and ozonated solutions. Ozonation appeared to be beneficial to the corrosion of aluminum alloys, decreasing corrosion rates and the amount of crevice corrosion compared to aerated seawater. The general corrosion resistance of copper was higher in ozonated vs. aerated solutions, however, the crevice corrosion behavior was adversely affected. Although nickel is beneficial to the corrosion resistance of copper-nickel alloys in aerated seawater, alloys with higher nickel concentrations were adversely affected both in terms of both general and crevice corrosion. jg p2.