材料工程2016，Vol.44Issue(11)：45-50,6.DOI:10.11868/j.issn.1001-4381.2016.11.007
冷喷涂CoNiCrAlY涂层在Na2SO4熔盐中的热腐蚀行为
Hot Corrosion Behavior of Cold-sprayed CoNiCrAlY Coating in Na2 SO4 Salt
摘要
Abstract
CoNiCrAlY coatings were prepared by cold spray process .After deposition ,the pre‐oxida‐tion treatment of the coating was performed by vacuum heat‐treatment .The microstructure and phase constituent of coating were characterized by XRD ,SEM and EDS .The hot corrosion behavior of as‐sprayed and pre‐oxidized CoNiCrAlY coatings in molten Na2 SO4 at 900℃ was also studied .The re‐sults show that the as‐sprayed coating presents a dense structure with low porosity (less than 0 .28% , volume fraction) and low oxygen content (0 .12% ,mass fraction) .Vacuum pre‐oxidation treatment forms a continuous and denseα‐Al2 O3 layer on the coating surface ,with an average thickness of about 0 .26μm .As‐sprayed and pre‐oxidized coatings can protect the substrate from hot corrosion due to the formation of a continuous and dense α‐Al2 O3 layer .Moreover ,the vacuum pre‐oxidation treatment can alleviate the diffusion of S and O into coating ,and thus the hot corrosion resistance of coating is im‐proved .The damage of hot corrosion plays a more important role than high temperature oxidation . When corrosion in single Na2 SO4 molten salt with the same temperature ,the consumption speed of Al is two times of that in high temperate oxidation.关键词
MCrAlY涂层/热腐蚀/冷喷涂/真空预氧化/高温氧化Key words
MCrAlY coating/hot corrosion/cold spray/vacuum pre-oxidation/high temperature oxida-tion分类
矿业与冶金引用本文复制引用
张林伟,王鲁,王全胜,陆磊,宁先进..冷喷涂CoNiCrAlY涂层在Na2SO4熔盐中的热腐蚀行为[J].材料工程,2016,44(11):45-50,6.基金项目
江西省科技支撑计划项目资助（20151BBB50264）；江西省对外科技合作计划项目资助（20151BDH80002）；江西省自然科学基金项目资助 （）
