Nucleation and Growth of Anodic Electrocrystallized Products on Ship Hull Zinc in Salt Water Solutions
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The structure of corrosion products formed on a zinc alloy with and without a steel couple and exposed in various salt water electrolytes was studied as a function of time. A film growth mechanism is hypothesized involving nucleation of ZnO platelets in a near-surface electrolyte layer adjacent to anodic areas. Inclusion areas on the zinc surface are lead-rich corrosion product initiation points, and a passivating film tends to form over these areas. Hexagonal ZnO platelets are the primary corrosion product with secondary products categorized and presented. X-ray diffraction powder patterns suggest a ZnCO3 product and a ZnCl2 complex product in the base film.
- Properties of Metals and Alloys
- Marine Engineering