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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

BARBATO R, SALVADOR et al. STUDY OF THE EFFECT OF TEMPERATURE ON THE HARDNESS, GRAIN SIZE, AND YIELD IN ELECTRODEPOSITION OF CHROMIUM ON 1045 STEEL. J. Chil. Chem. Soc. [online]. 2008, vol.53, n.1, pp.1429-1432. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072008000100022.

A study was made on the effect of temperature on the electrodeposition of hard chromium on 1045 steel within a range of 30° to 60°C, as shown by variations in reaction yield, surface hardness, and depositional grain size. Increase in temperature produced a decrease in faradic yield of the reaction of between 17% and 9%, an increase in hardness from 550 to 700 Brinelli, and a decrease in deposited chromium grain size from 278 to 32.4 urn. The most notable effect of temperature difference was observed between 30° and 40°C. Chrono-potentiometric and potentiodinamic linear sweep were measured at 30°C, 40°C and 50 °C in an attempt to explain this behavior. The results obtained suggested the formation of a compact film typical of a nucleation process in chromium electrodeposition. An increase in temperature affects the formation of this film, decreasing its thickness and distributing it in a more homogeneous manner over the steel, as shown by a decrease in the grain size of the chrome deposited

Palavras-chave : electroplating; hard chromium; hardness; grain size; reaction yield chrono potentiometric and potentiodinamic linear sweep.

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