Hexagonal Modification of Black Chromium Electro-deposit

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THE formation of a hexagonal modification of an electro-deposited chromium has been discussed since the first announcement was made. In 1935, L. Wright et al. 1 determined the conditions for the production of the hexagonal form from chromic acid baths, and recently C. A. Snavely2 fully examined the structural characteristics of the electro-deposited chromium from chromic acid baths containing sulphate ion.

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  1. 1

    Wright, L., Hirst, H., and Riley, J., Discuss. Farad. Soc., 1253 (1935).

  2. 2

    Snavely, C. A., Trans. Electrochem. Soc., 92, 537 (1947).

  3. 3

    Siemense and Halske, Ger. Pat. 754,360, Nov. 6, 1933.

  4. 4

    Ishida, T., Noda, Y., and Okada, H., J. Metal Finishing Soc. Japan, 10, 381 (1959).

  5. 5

    Quaely, M. F., Proc. Fourteenth Ann. Conv. Amer. Electroplaters' Soc., 48 (1953).

  6. 6

    Sasaki, K., and Sekito, S., J. Soc. Chem. Indust. Japan, 33, B, 482 (1930).

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OKADA, H., ISHIDA, T. Hexagonal Modification of Black Chromium Electro-deposit. Nature 187, 496–497 (1960) doi:10.1038/187496a0

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