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The present state of knowledge regarding the atmospheric corrosion of nickel and monel is summarized. The mechanism of corrosion is described with respect to both the fogging and later stages of weathering. With these metals, the effect of shelter from the rinsing action of rain is not pronounced. It seems probable that the corrosion-time relationship is practically linear. Of the various methods for quantitative determination of the amount of corrosion in field tests, measurements of loss in weight are shown to be most expedient for high-nickel alloys. A marked beneficial effect of chromium alloyed in nickel is observed. For the convenience of the design engineer, the available weight-loss data are presented graphically together with a discussion of the engineering significance of all the assembled information.
Wesley, W A
Assistant Director, The International Nickel Co., Inc., Research Labs., Bayonne, N. J.