SEDL / STP / STP947-EB / STP20041S

Corrosion Performance of Aluminum and Zinc-Aluminum Thermal Spray Coatings in Marine Environments

Shaw, BA
Materials engineers, Marine Corrosion Branch and Physical Metallurgy Branch, David Taylor Naval Ship Research and Development Center, Bethesda, MD

Leimkuhler, AM
Materials engineers, Marine Corrosion Branch and Physical Metallurgy Branch, David Taylor Naval Ship Research and Development Center, Bethesda, MD

Moran, PJ
Associate professor, The Johns Hopkins University, Baltimore, MD

Pages: 19    Published: Jan 1987

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Abstract

The long-term marine corrosion performance of commercially pure aluminum, commercially pure zinc, two layered zinc-aluminum, and two zinc-aluminum coatings on steel substrates was evaluated. The investigation consisted of marine exposures and an electrochemical evaluation of coating polarization behavior. Corrosion exposures were conducted in the marine atmosphere, the marine splash and spray zone, and under full seawater immersion. Scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and X-ray diffraction were utilized for topographic, compositional, and structural analyses of the coatings.