Hot corrosion has been extensively observed in various high temperature applications,which might cause large economic losses.To deepen the insight and understanding of hot corrosion,herein,we provide a detailed discus...Hot corrosion has been extensively observed in various high temperature applications,which might cause large economic losses.To deepen the insight and understanding of hot corrosion,herein,we provide a detailed discussion on hot corrosion induced by molten sulfate salt,in which Na_(2)SO_(4)is the main chemical reactant.The hot corrosion is triggered and sustained by the negative solubility gradient of protective oxide from the oxide/salt interface to salt/gas interface.In this work,we reviewed several key factors,including temperature,gas composition,molten salt composition,alloy element and external stress,influencing the hot corrosion of alloy beneath the molten salt.The application of anti-corrosion coating seems to be the most effective and commercial mothed to mitigate hot corrosion.Therefore,the progress of the development of effective coatings,e.g.,Ni-Cr coatings,aluminide coatings,silicide coatings and MCrAlY(X)coatings,has also been summarized.展开更多
A comparative study of high chromium(Super304H)and high manganese low chromium heat-resistant steel(HT630)was carried out at 650℃in steam.Results indicate that the high manganese content in HT630 significantly improv...A comparative study of high chromium(Super304H)and high manganese low chromium heat-resistant steel(HT630)was carried out at 650℃in steam.Results indicate that the high manganese content in HT630 significantly improved its oxidation resistance.It is ascribed to the formation of a dense protective MnCr_(2)O_(4) oxide layer during oxidation.MnCr_(2)O_(4) layer effectively inhibits the diffusion of iron,suppresses the growth of ironrich oxides,promotes the formation of an iron-rich protective interface with the matrix,and improves the overall oxidation resistance.展开更多
基金funded by the U.S.Department of Energy,National Energy Technology Laboratory(NETL)under the contract number DE-FE0031548。
文摘Hot corrosion has been extensively observed in various high temperature applications,which might cause large economic losses.To deepen the insight and understanding of hot corrosion,herein,we provide a detailed discussion on hot corrosion induced by molten sulfate salt,in which Na_(2)SO_(4)is the main chemical reactant.The hot corrosion is triggered and sustained by the negative solubility gradient of protective oxide from the oxide/salt interface to salt/gas interface.In this work,we reviewed several key factors,including temperature,gas composition,molten salt composition,alloy element and external stress,influencing the hot corrosion of alloy beneath the molten salt.The application of anti-corrosion coating seems to be the most effective and commercial mothed to mitigate hot corrosion.Therefore,the progress of the development of effective coatings,e.g.,Ni-Cr coatings,aluminide coatings,silicide coatings and MCrAlY(X)coatings,has also been summarized.
基金financially supported by the Excellent Youth Science and Technology Fund Project of Xi’an University of Science and Technology(6310221009)
文摘A comparative study of high chromium(Super304H)and high manganese low chromium heat-resistant steel(HT630)was carried out at 650℃in steam.Results indicate that the high manganese content in HT630 significantly improved its oxidation resistance.It is ascribed to the formation of a dense protective MnCr_(2)O_(4) oxide layer during oxidation.MnCr_(2)O_(4) layer effectively inhibits the diffusion of iron,suppresses the growth of ironrich oxides,promotes the formation of an iron-rich protective interface with the matrix,and improves the overall oxidation resistance.
