Abstract
SummaryDuring cadmium electrodeposition from cyanide electrolytes, intensive hydrogenation not only of the steel substrate but also of the first layers of the cadmium deposit takes place. Hydrogen codeposited with cadmium is in the mobile state and when plated specimens are aged at room temperature (20°C) it diffuses from the deposit into the steel, resulting in an increase of hydrogen concentration in the steel substrate. This effect of the ‘reverse’ hydrogen diffusion from the deposit into the substrate is revealed to an even greater extent when bright cadmium plated specimens are heated. In this case, when the cadmium deposit is thicker than 10 μm the hydrogen concentration in the steel substrate increases 1·5-2 times, a corresponding deterioration of steel ductility being observed. The higher hydrogen permeability of dull cadmium deposits results in a significant decrease of hydrogen concentration in specimens having such coatings after only 2 h of heating at 200°C. The heating of bright plated specim...
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