Abstract
IN NATURE of Feb. 11 (p. 222) it is stated that “An X-ray examination of finely divided iron, nickel, and chromium, conducted by F. Krüger and E. Nähring at Greifswald, has shown conclusively that films of oxide thicker than 10−7 cm. are not present on the surface of a passive metal.” Lest a wrong impression be gained from this statement, I would venture to add a few remarks on the factors which determine the thickness of protective films.
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EVANS, U. Passivity and Protective Oxide Films. Nature 121, 351–352 (1928). https://doi.org/10.1038/121351b0
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DOI: https://doi.org/10.1038/121351b0
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