Accession Number:

ADA021762

Title:

Nucleation and Growth of Anodic Electrocrystallized Products on Ship Hull Zinc in Salt Water Solutions

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Todd, James M.

Report Date:

1975-12-01

Pagination or Media Count:

176.0

Abstract:

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.

Descriptors:

• *ZINC ALLOYS
• *SEA WATER CORROSION
• *SHIP HULLS
• ELECTROCHEMISTRY
• NUCLEATION
• STEEL
• SURFACES
• ELECTROLYTES
• CRYSTAL GROWTH
• ANODIC COATINGS
• ANODIC POLARIZATION
• LEAD(METAL)
• SALT WATER
• GALVANIC CORROSION
• THESES
• ZINC COMPOUNDS
• METAL FILMS
• X RAY DIFFRACTION

Subject Categories:

• Properties of Metals and Alloys
• Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE