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A study of the kinetics of passive layer formation on CrMo alloys

✍ Scribed by M. Klimmeck

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
499 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

Electrochemical measurements

on alloys of the two pure metals chromium and molybdenum in the concentration range up to 20 wt% MO were carried out. The investigations took place under stationary and non-stationary conditions. Stationary current-potential curves show that the behaviour in the active region is mainly determined by molybdenum.

The active state, easily obtained for pure chromium, first appears in 5N HCl solution for the 10 wt% alloy; for the 20 wt% alloy it does not appear at all. This corresponds to the behaviour of pure molybdenum, for which an active region in aqueous electrolytes could not clearly be found.

In contrast to this no specific influence of molybdenum could be found in the passive and trampassive region. The behaviour of the alloys is quite similar to that of pure chromium. This is indicated by galvanostatic switch-on and potentiostatic step experiments.

As for pure chromium the results may be interpreted in terms of the sim@neous-place-exchange mechanism.

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