Passive Films, Surface Structure and Stress Corrosion and Crevice Corrosion Susceptibility. Part I. A Qualitative Ellipsometric-Electrochemical Approach for the Study of Film Growth under Organic Coatings. Part II. Hydrogen Interactions with Stressed Titanium-Palladium Alloys and Stressed Vanadium Explored with Field Ion Microscopy.
Technical summary rept. no. 10,
NATIONAL BUREAU OF STANDARDS WASHINGTON DC NATIONAL MEASUREMENT LAB
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The objective of the work was to gain a deeper understanding of the mechanisms governing the corrosion protective actions of paints on metal surfaces. Computer modeling and experiments with collodion coatings on iron substrates indicated that changes in the ellipsometric parameter delta could, for the most part, be safely interpreted as thickness alterations in the substrate oxide film. Experiments with the Fe-collodion system in dilute chloride solutions exhibited three sequential stages of activity, two of which could be interpreted in terms of corrosion mechanisms using the optical and electro-chemical measurements. Three titanium-palladium alloys, nominally containing one, two, and three at. palladium, were prepared by vacuum annealing titanium wires that were previously electroplated with palladium thin films. Field ion micrographs obtained from these materials at temperatures less than 30 K indicated significant alloy inhomogeneities. In addition, the micrographs indicated that the alloys offered no greater resistance to hydrogenstress induced crack formation and development than unalloyed titanium under similar conditions.
- Physical Chemistry
- Coatings, Colorants and Finishes