STUDY OF CORROSION AND POROSITY OF ELECTRODEPOSITED COATINGS BY HYDROGEN DIFFUSION TECHNIQUE.
ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV
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Hydrogen sorption was used in a study to determine whether corrosion of steel and porosity of coatings can be evaluated in this manner. Attempts to measure corrosion produced hydrogen on bare steel hydrogen detection probes resulted in visible rust film on the probe but hydrogen sorption was too small to be useful as an evaluation technique. For porosity tests hydrogen detection probes were cadmium plated to three thicknesses and were subjected to three test conditions immersion in 2 HCl, or dilute caustic cyanide solution cathodic charging and a boil test. No conclusive differences were observed for hydrogen sorption in relation to thickness or porosity when immersion or cathodic charging conditions were used. There was an appreciable and progressive difference in hydrogen sorption with increased plate thickness in the boil test conditions. Application of the method to a detailed study of porosity and porosity related corrosion is recommended for the commonly used protective coatings for metals. Author
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys
- Test Facilities, Equipment and Methods