Journal of the Chilean Chemical Society
versión On-line ISSN 0717-9707
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. doi: 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
Palabras clave : electroplating; hard chromium; hardness; grain size; reaction yield chrono potentiometric and potentiodinamic linear sweep.