Effect of SO42- on the passive and pitting behavior of 316L austenite stainless steel in a Cl--containing solution
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摘要: 利用動電位極化、電化學阻抗、恒電位極化以及恒電流極化等電化學測試手段,并結合掃描電鏡進行點蝕形態觀察,探究了含Cl-溶液中SO42-濃度對316L奧氏體不銹鋼的鈍化行為及點蝕行為的影響.結果表明,含Cl-溶液中SO42-的加入能夠使316L不銹鋼鈍化區變寬,使點蝕電位變正,維鈍電流密度降低,進而提高316L的耐點蝕能力.但是在點蝕發生后,隨著SO42-濃度的升高,點蝕內部和邊緣形態表現出更為復雜的趨勢,蝕坑的周長面積比明顯增大.Abstract: The effect of SO42- on the passive and pitting behavior of 316L austenite stainless steel was investigated in a Cl--containing solution using potentiodynamic polarization tests, electrochemical impedance spectroscopy tests, potentiostatic polarization tests, and galvanostatic polarization tests. In addition, scanning electron microscopy was used to observe the pitting morphology. The results show that the increased SO42- concentration increases the passive region of 316L, makes the pitting potential more positive, and decreases the current density, indicating an improved pitting resistance. However, the pitting morphology shows a more complicated trend, and the roughness of the pits increases with the increased SO42- concentration after pitting occurred.
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Key words:
- austenite stainless steel /
- sulphate ion /
- chloride ion /
- polarization /
- pitting
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參考文獻
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