Ni—xCr-10Al合金于700—800℃的氧化-硫化腐蚀  

OXIDIZING-SULFIDIZING CORROSION OF Ni-xCr-10Al ALLOYS AT 700—800℃

作　　者：卢兰英[1] 潘太军[2] 牛焱[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016 [2]常州大学材料科学与工程学院,常州213164

出　　处：《金属学报》2011年第8期1026-1031,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目50971129~~

摘　　要：研究了Ni-10Al和Ni-xCr-10Al(x=3,5,10)合金在700—800℃的H_2-H_2S-CO_2混合气氛中的腐蚀行为.结果表明,添加Cr可降低Ni-10Al合金的腐蚀速率;在700℃,Ni-10Al合金氧化动力学曲线遵循直线规律,而Ni-xCr-10Al合金的氧化动力学曲线则为多段抛物线;在800℃,所有合金的腐蚀均遵循近似抛物线规律且合金中的Cr含量越高腐蚀速率越低;Ni-10Al合金生成含Ni_3S_2和Al_2O_3的复杂氧化膜;Ni-3Cr-10Al生成不规则的Al_2O_3膜,其下为CrS的内腐蚀区;而Ni-5Cr-10Al和Ni-10Cr-10Al则生成Al_2O_3薄膜.计算了混合气氛中的平衡氧势和硫势,预测了合金与气氛可能发生的反应,并解释了腐蚀机制.The corrosion behavior of Ni-10Al and Ni xCr-10Al （x=3, 5, 10） alloys at 700-800℃ in H2-H2S-CO2 mixtures was studied. The addition of Cr resulted in a significant reduction of the corrosion rate of the Ni 10Al alloy： at 700 ℃ the corrosion of Ni-10Al alloy showed a linear kinetic law, but Ni-xCr-10Al followed the multi stage parabolic rate law; at 800 ℃ the corrosion of all the alloys followed a quasi parabolic rate law. Ni-10A1 alloy formed a complex scale of Ni3S2 and A12O3, whereas Ni-3Cr 10Al formed an irregular scale of A12O3 with a CrS inner corrosion region, and a thin layer of A12O3 formed on Ni-5Cr-10Al and Ni 10Cr-10Al alloys. The equilibrium partial pressures of oxygen and sulfur in the mixed gases were calculated to estimate the possible reactions between the alloy components and the gaseous atmosphere, and the corrosion mechanisms were also discussed.

关 键 词：NI-CR-AL合金 氧化 硫化 CR 

分 类 号：TG172.3[金属学及工艺—金属表面处理]