【摘要】：采用電化學(xué)測(cè)試研究了S32750超級(jí)雙相不銹鋼在3.5%Na Cl溶液中的臨界點(diǎn)蝕溫度(CPT)及電化學(xué)腐蝕機(jī)理,結(jié)合試樣點(diǎn)蝕前后的形貌變化,得出S32750不銹鋼的臨界點(diǎn)蝕溫度為71℃。在低于臨界點(diǎn)蝕溫度時(shí),不銹鋼表面能形成穩(wěn)定的鈍化膜;高于臨界點(diǎn)蝕溫度時(shí),由于Cl-的活性增加及鈍化膜的溶解,不銹鋼表面產(chǎn)生點(diǎn)蝕現(xiàn)象,且溫度越高,點(diǎn)蝕越劇烈。構(gòu)建了雙相不銹鋼S32750臨界點(diǎn)蝕溫度前后的電化學(xué)腐蝕模型。
[Abstract]:The critical pitting temperature (CPT) and electrochemical corrosion mechanism of S32750 super duplex stainless steel in 3.5%Na Cl solution were studied by electrochemical measurement, and the morphology of S32750 super duplex stainless steel before and after pitting corrosion was studied. The critical pitting temperature of S32750 stainless steel is 71 鈩，

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