ANODIC FILM FORMATION ON A SPUTTER-DEPOSITED AL-30 AT-PERCENT-MO ALLOY

Al-30 at% Mo alloy films, of excellent adherence, compositional and th ickness uniformity have been sputter-deposited on to electropolished a nd anodized aluminium substrates. Anodic oxidation of the amorphous al loy films results in anodic oxide which is free from molybdenum specie s in the outer regions and enriched in molybdenum species in the inner regions. The development of the film can be readily interpreted from current knowledge of the mobilities of aluminium, oxygen/hydroxyl and molybdenum species gained from anodizing of relatively pure aluminium in molybdate solution. However, unlike the previous situation which le ads to relatively low levels of incorporated molybdate species, signif icant incorporation results from alloy oxidation which influences mark edly anodic oxide resistivity and field strength during anodic oxidati on.