研究了Ni--10Al和Ni-xCr-10Al (x=3, 5, 10)合金在700-800℃的H2-H2S-CO2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Ni3S2和Al2O3的复杂氧化膜; Ni-3Cr-10Al生成不规则的Al2O3膜, 其下为CrS的内腐蚀区;而Ni--5Cr--10Al和Ni--10Cr--10Al则生成Al2O3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 ignificant 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–10Al alloy formed a complex scale of Ni3S2 and Al2O3, whereas Ni–3Cr–10Al formed an irregular scale of Al2O3 with a CrS inner corrosion region, and a thinlayer of Al2O3 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.
[1] Natesan K. Corrosion, 1985; 41: 646
[2] Gesmundo F, Young D J, Roy S K. High Temp Mater Process, 1989; 8: 149
[3] Stringer J. In: Embury J D ed., High–Temperature Oxidation and Sulfidation Processes. New York: Pergamon Press, 1990: 257
[4] Mrowec S, Przybylski K. High Temp Mater Process, 1984; 6: 1
[5] Mrowec S, Przybylski K. Oxid Met, 1985; 23: 107
[6] He Y R, Douglass D L, Gesmundo F. Oxid Met, 1992; 37: 413
[7] He Y R, Douglass D L, Gesmundo F. Oxid Met, 1992; 37: 217
[8] Niu Y, Gesmundo F, Viani F. Corros Sci, 1994; 36: 1885
[9] Niu Y, Gesmundo F, Viani F, Rizzo F. Corros Sci, 1994; 36: 1973
[10] Fu G Y, Niu Y, Wu W T. Trans Nonferrous Met Soc China, 2002; 12: 874
[11] Fu G Y, Niu Y, Wu W T. Chin Rare Earth, 2002; 23: 16
(付广艳, 牛焱, 吴维tao. 稀土, 2002; 23: 16)
[12] Fu G Y, Niu Y, Wu W T. Rare Met Mater Eng, 2004; 33:417
(付广艳, 牛焱, 吴维tao. 稀有金属材料与工程, 2004; 33: 417)
[13] Fu G Y, Niu Y, Wu W T. Acta Metall Sin, 1999; 35: 221
(付广艳, 牛焱, 吴维tao. 金属学报, 1999; 35: 221)
[14] Regina J R, DuPont J N, Marder A R. Mater Sci Eng, 2005; A404: 71
[15] Regina J R, DuPont J N, Marder A R. Mater Sci Eng, 2005; A405: 102
[16] KaiW, ChangMT, Liu C D, Chiang D L, Chu J P. Mater Sci Eng, 2002; A329: 734
[17] Kai W, Chu J P, Huang R T, Lee P Y. Mater Sci Eng, 1997; A39: 859
[18] Brady M P, Tortorelli P F, More K L, Walker L R. Oxid Met, 2010; 74: 1
[19] Zhang X J, Wang S Y, Gesmundo F, Niu Y. Oxid Met, 2006; 65: 151
[20] Niu Y, Zhang X J, Wu Y, Gesmundo F. Corros Sci, 2006; 48: 4020
[21] Giggins C S, Petti F S. J Electrochem Soc, 1971; 118: 1782
[22] Stott F H, Wood G C. Corros Sci, 1971; 11: 799
[23] Kostad p. High Temperature Corrosion, London: Eleviser, 1988: 425
[24] Giggins C S, Pettit F S. Oxid Met, 1980; 14: 363
[25] He Y R, Douglass D L. Oxid Met, 1993; 40: 337
[26] Kai W, Huang R T. Oxid Met, 1997; 48: 59
[27] Devan J H, Tortorelli P F. Corros Sci, 1993; 35: 1065
