SO42-浓度对304不锈钢在NaCl 溶液中点蚀行为影响的研究

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材料工程 ›› 2012, Vol. 0 ›› Issue (7) : 64-70.

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测试与表征

SO₄^2-浓度对304不锈钢在NaCl 溶液中点蚀行为影响的研究

杜楠¹, 田文明¹, 赵晴¹, 孟保利²

作者信息 +

Effect of SO₄^2- Concentration on 304 Stainless Steel Pitting Corrosion in NaCl Solution

DU Nan¹, TIAN Wen-ming¹, ZHAO Qing¹, MENG Bao-li²

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摘要

利用动电位极化、电化学阻抗谱(EIS)和激光电子散斑干涉(ESPI)研究了3.5%NaCl溶液中,SO₄^2-浓度对304不锈钢点蚀行为的影响。使用0.3V(vs SCE)极化条件下的计时电流法结合ESPI确定了点蚀诱导时间。结果表明:当SO₄^2-浓度为0.5%时,不锈钢的耐蚀性最差;当SO₄^2-浓度低于1%时,不锈钢的耐蚀性较不存在SO₄^2-时的耐蚀性差;当SO₄^2-浓度高于1%时,不锈钢的耐蚀性较不存在SO₄^2-时的耐蚀性好。在3.5%NaCl+0.5%Na₂SO₄溶液中,点蚀诱导时间是4s,在3.5%NaCl溶液中和3.5%NaCl+4%Na₂SO₄溶液中点蚀诱导时间分别是9s和94s。

Abstract

Effect of SO₄^2- concentration on 304 stainless steel pitting corrosion in 3.5%NaCl solution was investigated by means of dynamic potential polarization, electrochemical impedance spectroscopy (EIS) and electronic speckle pattern interferometer (ESPI). The pitting induction time τ under 0.3V (vs SCE) polarization was detected by means of ESPI and chronoamperometry. The results showed that the stainless steel corrosion resistance was the worst when the SO₄^2- concentration was 0.5%. When the SO₄^2- concentration was below 1%, the corrosion resistance was worse than that having no SO₄^2-. When the SO₄^2- concentration was beyond 1%, the corrosion resistance was better. The pitting induction time τ of the 304 stainless steel were 4s, 9s and 94s in 0.5%NaCl+0.5%Na₂SO₄ solution, 3.5%NaCl solution and 3.5%NaCl+4%Na₂SO₄ solution respectively.

导出引用

杜楠, 田文明, 赵晴, 孟保利. SO₄^2-浓度对304不锈钢在NaCl 溶液中点蚀行为影响的研究[J]. 材料工程, 2012, 0(7): 64-70

DU Nan, TIAN Wen-ming, ZHAO Qing, MENG Bao-li. Effect of SO₄^2- Concentration on 304 Stainless Steel Pitting Corrosion in NaCl Solution[J]. Journal of Materials Engineering, 2012, 0(7): 64-70

中图分类号： TG174

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