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however, be due to differences in the iron used and in the acid 
concentration employed. Though the effect of an alloyed metal 
on the corrosion of iron in acid may be markedly different than 
the effect of the same metal added to the acid in the form of 
a salt,'^ it may be of interest to point out that Monnartz ® found 
that the addition of chromium to iron increased, if anything, 
the solubility of the resulting alloy in hydrochloric or sulphuric 
acid, conclusions which are in good agreement with our results. 
This work has furnished no evidence to show that the pas- 
sivifying effect of chromates or dichromates on iron is due to 
their chromium content. 
’ Burgess, C. F., and Aston, J., Influence of various elements on the cor- 
rodibility of iron, Journ. Ind. Eng. Chem. 5 (1913) 458-462. 
® Monnartz, P., The study of the Fe-Cr alloys with particular regard 
to their solubility toward acids, Metallurgie 8 (1911) 161, 193; Chem. Abst. 
5 (1911) 3035. 
