A Comparison of High-Temperature Corrosion between Cu/Ni Multilayers and Cu-Ni Alloys with the same Composition

摘要

Stratified deposits are a subject of interest because of their original features (modification of magnetic, structural and mechanical properties, increase in corrosion resistance...). The high-temperature corrosion of thick electrodeposited Cu/Ni multilayers and of alloys with the same composition has been investigated and compared. For multilayers elaboration, the deposition has been conducted under galvanostatic conditions using a dual-bath technique. The baths have been optimized in order to obtain a planar stratification. Thermogravimetric analysis of the oxidation of these materials between 600deg C and 1000deg C under 1 atm of O_2 exhibits rates and reaction mechanisms very different than those observed for the alloy of the same composition. The results indicate that products of corrosion are different in the two cases.