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采用直流磁控溅射法在1Cr18Ni9Ti奥氏体不锈钢表面制备Al Y涂层,并对部分涂层进行600℃真空扩散退火和预氧化处理,研究了不锈钢和具有不同状态Al Y涂层的不锈钢的热腐蚀行为。结果表明:不锈钢以及涂层试样的腐蚀动力学近似服从抛物线规律;24 h腐蚀后,不锈钢试样增重最大,涂层试样增重比不锈钢试样小,三种涂层试样中,增重从大到小依次是:未处理的涂层试样、真空扩散退火试样及预氧化试样。不锈钢在Na2SO4盐膜下腐蚀24 h后,形成了以Cr2O3和Ni O为主,及少量Fe2O3的氧化膜;在不锈钢表面溅射Al Y涂层并经过适当的预处理,促进了表面Al2O3及Cr2O3保护膜的形成,抑制了基体金属的氧化,提高了不锈钢的热腐蚀抗力。
The Al Y coating was prepared on the surface of 1Cr18Ni9Ti austenitic stainless steel by direct current magnetron sputtering method. Some coatings were annealed and pre-oxidized by vacuum diffusion at 600 ℃. The effects of stainless steel and stainless steel with different states of AlY coating Hot corrosion behavior. The results show that the corrosion kinetics of stainless steel and the coated sample approximately obey the parabolic law; after 24 h of corrosion, the weight of the stainless steel sample is the largest, the weight of the coated sample is smaller than that of the stainless steel sample, In descending order of weight are: untreated coating samples, vacuum diffusion annealing samples and pre-oxidation samples. The stainless steel was etched under Na2SO4 salt solution for 24 h, and the oxide film was mainly composed of Cr2O3 and NiO with a small amount of Fe2O3. The AlY coating was sputtered on the surface of stainless steel and the surface pretreatment promoted the surface Al2O3 and Cr2O3 The formation of the protective film inhibits the oxidation of the base metal and improves the hot corrosion resistance of the stainless steel.