Determing the Susceptibility of 304L Austenitic Stainless Steel to Intergranular Corrosion by Square-wave Potentiostatic Pulse Technique
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摘要: 用方波電位脈沖法,對AISI304L不銹鋼主要由晶界貧鉻引起的晶間腐蝕敏感性隨敏化時間的變化規律進行了研究。通過比較發現方波電位脈沖實驗與EPR方法、10%草酸電解實驗以及H2SO4-CuSO4-鋼屑實驗之間存在著較好的對應關系。方波電位脈沖法可以精確地定量反映304L不銹鋼的晶間腐蝕敏感性,對應第10個脈沖的再活化電流密度峰值ir10可作為反映晶間腐蝕敏感性的特征參數。Abstract: The susceptibility of AISI 304L austenitic stainless steel to intergranular attack mainly caused by the Cr-depletion in grain boundaries was detected by the square-wave potentiostatic pulse technique. The degree of the sensitization of 304L stainless steel can be exactly and quantitively illustrated by this technique.The maximum reactivation current density corresponding to 10th pulse,ir10,was selected as a characteristic parameter for the detection of sensitization.The degree of the sensitization determined by square-wave potentiostatic pulse technique was in agreement with those obtained from DL-EPR and ASTM standard tests.
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