Corrosion resistant modified aluminide coatings

Degradation of coatings by high temperature atmospheric corrosion and molten salt deposits

“…11.2. The mechanism by which platinum affects the coating lives is not completely understood; it may improve Al 2 0 3 adherence, causing an Al 2 0 3 scale to develop with slower transport properties due to higher purity, and it may inhibit interdiffusion between the coating and the substrates [6,7]. Other precious elements such as rhodium produce similar effects [8], and more recent results show that palladium also may produce beneficial effects [9].…”

Preparation technique and alloying effect of aluminide coatings as tritium permeation barriers: A review

“…It is reported [89] that when Cr was predeposited on the IN 100 nickel-base superalloy, the subsequent aluminide coatings prepared by the PC technique showed a typical three-layer structure, and the outer layer was enriched with Cr; while the coatings prepared by the CVD technique was a pure NiAl layer, and Cr was enriched beneath. The reason is that in the two preparation processes, the activity of Al differs, resulting in different distributions and existing forms of Cr in the aluminide coatings.…”

“…For the HDA aluminide coatings, the presence of Si not only can flat the tongue-shape FeAl intermetallic layer, but also can suppress the voids and cracks in the coatings, and thus improve the coating performance like the cyclic oxidation [39,87,88]. Moreover, some transition metal elements are beneficial for the aluminide coatings [48,89], for instance, Cr and Pt can protect the aluminide coatings against the thermal corrosion [89], and W, Mo, Nb elements can suppress the internal oxidation of aluminide coatings during the high temperature oxidation, resulting in denser Al 2 O 3 films forming on MANET steels [48].…”

High pressure transport, structural, and first principles investigations on the fluorite structured intermetallic, PtAl2

“…4 PtAl 2 has potential application as corrosion resistance coating. 5 Many of these compounds become superconducting at low temperatures. 6 For example, AuIn 2 and AuAl 2 are found to be type-I superconductor with T c of 207 and 160 mK, respectively.…”