Corrosion behavior of 2507 duplex stainless steel in simulated SO2-Polluted seawater
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摘要: 采用開路電位、電化學阻抗譜(EIS)、Mott-Schottky曲線和浸泡腐蝕實驗研究了2507雙相不銹鋼在含不同濃度(0,0.001和0.01 mol·L-1)NaHSO3模擬海水中的腐蝕行為. 研究表明:開路電位隨NaHSO3濃度的增加而負移,腐蝕傾向增大;電荷轉移電阻Rt隨濃度的增加而減小,耐蝕性降低;2507不銹鋼的腐蝕形態為局部腐蝕,點蝕程度隨濃度升高有所加劇,腐蝕速率隨濃度的增加而增大;Mott-Schottky曲線和成膜后電化學阻抗譜測試表明,NaHSO3的加入增加了2507不銹鋼表面鈍化膜的點缺陷濃度,降低了鈍化膜的穩定性,電荷轉移阻力減小,腐蝕更容易發生. 這可能歸因于NaHSO3的加入增加了模擬海水的酸度,并隨NaHSO3濃度的增加促進了不銹鋼表面鈍化膜的破壞.Abstract: The corrosion behavior of 2507 duplex stainless steel in simulated seawater containing different concentrations of NaHSO3 solution was investigated using open circuit potential, electrochemical impedance spectroscopy (EIS), Mott-Schottky curves, and an immersion corrosion test. The results depict that the open circuit potential shifts negatively with an increase in the concentration of NaHSO3, whereas the corrosion tendency of the steel increases. The charge transfer resistance (Rt) decreases with the increased concentration of NaHSO3, which suggests that the corrosion resistance is reduced. The corroded stainless steel exhibits localized pitting corrosion. Further, the degree of corrosion as well as the corrosion rate increases with an increase in the concentration of NaHSO3. The results that are obtained using the Mott-Schottky curves and EIS test depict that the addition of NaHSO3 increases the concentration of point defects on the passive surface film of 2507 stainless steel, reducing its stability and decreasing its charge transfer resistance, resulting in an increased probability of corrosion. This may be caused due to the fact that the addition of NaHSO3 increases the acidity of the solution, which accelerates the damage that is caused to the passive film on the stainless steel.
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Key words:
- 2507 stainless steel /
- corrosion behavior /
- passive film /
- pitting corrosion /
- sodium hydrogen sulfite
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參考文獻
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