Self-passivating behavior of 316L stainless steel in high-temperature acetic acid solution
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摘要: 研究了316L不銹鋼在85℃,含0.2% KCl的60%醋酸溶液中的自鈍化行為.通過測試試樣的恒電流陰極極化曲線,以及恒電流陰極極化后開路電位隨時間的變化曲線,提出了316L不銹鋼鈍化膜的結構模型.該模型認為316L不銹鋼鈍化膜由三層構成:最外層主要是由Fe的氧化物以及少量Cr的氧化物組成;第二層主要是Cr的氧化物,含有少量Fe,Mo和Ni的氧化物;最底層主要是Mo,Ni的氧化物和少量的Fe原子.研究發現:316L不銹鋼在實驗醋酸溶液中,經10mA陰極電流極化15min后鈍化膜生長參數γ最大,而經0.45mA陰極電流極化30min后鈍化膜生長參數γ最小;316L不銹鋼在實驗醋酸溶液中,經10mA陰極電流極化30min后,自鈍化電位最小,而經1mA陰極電流極化15min后,自鈍化電位最大.鈍化膜結構模型能很好地解釋316L不銹鋼在實驗醋酸溶液中的上述電化學行為.Abstract: The self-passivating behavior of 316L stainless steel in acetic acid solution was studied. The constant current polarization curve and the corrosion potential-to-time curve were measured. The results showed that passivation film was formed by three layers:oxides of Fe and small amount Cr in the first layer; oxides of Cr and small amount Fe, Mo, Ni in the second layer; and oxides of Mo, Ni and small amount Fe in the third layer. The structure model of passivation film can explain the electrochemical results well.
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Key words:
- electrochemistry /
- stainless steel /
- passivation film /
- acetic acid
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