Abstract
The change in the internal stresses in bright nickel coatings during and after cathodic polarization in 2 N H 2SO 4 in the presence of H 2SeO 3 was investigated by means of a spiral contractometer. The hydrogenation of the nickel coating is accompanied by the creation of high compression stresses. Beyond a certain extent of hydrogenation the release of stress during the hydrogen desorption after hydrogenation leads to the formation of cracks in the bright nickel layer. The first cracks appear approximately 30 min after hydrogenation, which coincides with the beginning of the decomposition of the nickel hydride phase. The cracking of the bright nickel coating follows a spiral pattern. At maximum hydrogenation a uniform network of cracks is formed.
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