论文部分内容阅读
通过对镍基合金进行不同温度的恒温熔融硫酸盐热腐蚀试验,对腐蚀产物横断面进行形貌观察及微区成分分析,研究了一种高铬镍基合金在恒温热腐蚀期间腐蚀产物分布特征及内氧化、内硫化行为。结果表明,该高铬镍基合金在900和950℃腐蚀100 h期间,合金氧化和硫化同时发生,且腐蚀产物中出现分层结构,由表及里各层中的主要氧化物分别为:Al2O3和Cr2O3,Al2O3,CrS。该合金在各温度的恒温热腐蚀期间,均发生Al元素的内氧化和Cr元素的内硫化;与外氧化膜相邻的区域为Al元素的内氧化区,远离外氧化膜的基体内部形成Cr元素的内硫化区;随腐蚀温度升高,内氧化区和内硫化区深度增加,内氧化物和内硫化物的尺寸增大。
Through the thermal corrosion test of nickel-based alloy at constant temperature and melting temperature, the morphologies and micro-composition of the cross-section of the corrosion products were studied. The corrosion products distribution characteristics of a high-chromium-nickel alloy during constant temperature hot corrosion Oxidation, internal vulcanization behavior. The results show that during the corrosion of the high chromium-nickel-base alloy at 900 and 950 ℃ for 100 h, the oxidation and sulfidation of the alloy occur simultaneously and the layered structure appears in the corrosion products. The main oxides in the layers are Al 2 O 3 and Cr 2 O 3 , Al2O3, CrS. During the hot corrosion at constant temperature, the internal oxidation of Al and the internal sulfuration of Cr occurred. The region adjacent to the outer oxide film was the internal oxidation region of Al, and the Cr As the corrosion temperature increases, the depths of the inner and outer sulfides increase, and the inner oxides and inner sulfides increase in size.