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A12O3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.
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