从热力学角度探讨了环烷酸-铁-硫化氢腐蚀体系的热力学性质，结果表明：在该体系中，腐蚀产物受硫化氢和环烷酸分压影响；钝化区为硫化氢腐蚀，硫化物在膜中的扩散为速率控制步骤；在腐蚀区这环烷酸腐蚀，环烷酸与金属表面的反应为速率控制步骤。根据相图，分析了两次出现腐蚀高峰的原因。
A thermodynamic analysis on the characteristics of iron/naphthenic acid/hydrogen sulfide ocrrosion system is presented.The results indicate that the corrosion products of this system are dependent on the partial pressures of hydrogen sulfide and naphthenic acid.In the passivation region,the diffusion process of sulfide in the surficial layer is the rate-determining step of corrosion.In the corrosion region,however,the corrosion rate is controlled by the reaction process of naphthenic acid on iron surface.And corrosion of iron can only occur when the partial pressure exceeds a critical value.On the basis of the phase diagrams,the reasons for the appearance of two peaks of corrosion rate with the change of temperature are discussed.It could be attributed to the formation and the decomposition of active sulfides.
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