Abstract
Oxygen-active elements such as yttrium and cerium are often used to improve the performance of high-temperature alloys. Recent studies demonstrate that the oxygen-active elements are also beneficial to the wear resistance of materials in corrosive environments or at elevated temperatures. In this work, the effect of yttrium and cerium on the corrosive erosion of an aluminide coating on 1030 steel at ambient temperature, in sulfuric and salty slurries, respectively, were investigated. The microstructure of the aluminide coatings was investigated using optical microscopy and transmission electron microscopy (TEM). The distribution of yttrium or cerium in the diffusion layer was analyzed using energy-dispersive spectroscopy (EDS), and the microhardness of the coating also was determined. The corrosion rate, polarization behavior and corrosive erosion of the Y/Ce-containing aluminide coatings, as well as their dry sand erosion at different temperatures from 30 to 190°C were evaluated. The results showed that the oxygen-active elements significantly increased the resistance of the aluminide coatings to corrosive erosion in silica-containing sulfuric acid slurry and silica-containing salt slurry, respectively. The modified aluminide coating also manifested a higher resistance to corrosion at ambient temperature, as well as to dry sand erosion at different temperatures.
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