The Influence of environmental factors on the pitting potential of stainless steel
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摘要: 用動電位掃描法研究了環境因素對NHB1、NHB3,316L和304四種不銹鋼點蝕電位的影響。環境因素的變化范圍為溫度0°—90℃,PH2—12,NaCl1—5%。實驗結果指出,在所研究的條件范圍內,Eb隨溫度的變化規律是,低于某一溫度（可稱之為Eb轉折溫度）時,隨著溫度上升,Eb迅速降低,而高于該溫度時,隨著溫度上升,Eb緩慢降低。這一現象可用Cl-、O2和H2O,在純化膜表面上的競爭吸附來解釋。隨著溶液中NaCl濃度加大,Eb總的規律是下降的。在中性和酸性范圍內,隨PH值加大,Eb是上升的。NHB1和NHB3在低溫下不出現點蝕;NHB1和316L在PH12時也不出現點蝕。Abstract: Potentiodynamic scanning method was used to study influence of environmental factors on the pitting potentials of types NHB-1、NHB-3、316L and 304 stainless steel. The changing ranges of temperature、PH and Nacl concentration were 0°-90℃、2-2 and 1%-5%,respectively. The experimenta 1 results showed that below certain temperature(It can be called Eb's as tran-siton temperature) the Eb rapidly decrease with the temperature increase while over this temperature,the Eb slowly decrease with the temperature increase in studied conditional ranges, preferential adsorption of Cl-、O2 and H2O on passivating films can be used to explain this pheiomenon. Increasing NaCl concentration,the Eb tend to decrease. The Eb increase with PH increase in neutral and acid solution.pitting corrosion was not found for the types of NHB-1 and NHB-3 stainless steel at Low temperature and for the types of NHB-1 and 316L stanless steel at PH12.
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