Effect of Si addition to improve the performance of type II and type I hot corrosion resistance of aluminide coating
Source abstract
Abstract
Microstructure and hot corrosion resistance of four aluminide coatings with different Si contents ranging from 0 at % to 30 at% are studied. Si primarily exists as CrSi 2 and (Cr,Ti) 5Si 3 in the upper zone of Si-modified aluminide coatings; CrSi 2 transforms into Cr 3 Si phase during corrosion process. These silicides hinder the inward diffusion of the corrosive elements, resulting in enhanced corrosion resistance of Si-modified aluminide coatings at 700 °C. Mechanisms of severe corrosion in coatings with Si at 900 °C was disclosed; high content of Si leads to insufficient Al to renovate Al 2O 3 scale, as well as high temperature causes fast depletion of Al.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Intermetallics and Advanced Alloy Properties · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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