Influence of Na₂S on the degradation kinetics of CCl₄ in the presence of very pure iron

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• 作者：E.B. Hansson ; M.S. Odziemkowski ; R.W. Gillham
• 关键词：Iron ; Sulphide ; CCl₄ ; Degradation ; Hydrogen embrittlement ; FeS
• 刊名：Journal of Contaminant Hydrology
• 出版年：2008
• 期刊代码：43_01697722
• 类别：env
• 出版时间：6 June 2008
• 卷：98
• 期：3-4
• 页码：128-134
• 文件大小：730 K

摘要

This paper presents the results of kinetic studies to investigate the effect of FeS film formation on the degradation rate of CCl₄ by 99.99%pure metallic iron. The film was formed by submersing metallic iron grains in an oxygen free HCO₃⁻/CO₃²⁻ electrolyte solution. When the grains had reached a quasi steady-state value of the corrosion potential, Na₂S_(aq) was injected. Upon injection, a µm thick poorly crystalline FeS film formed immediately on the iron surface. Over time, the iron became strongly corroded and both the FeS film and the metallic iron grains began to crack leading to exposure of bare metallic iron to the solution.