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Effect of SO_4~(2-) Concentration on 304 Stainless Steel Pitting Corrosion in NaCl Solution

Meng Bao-li

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Abstract

Effect of SO2-4 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 SO2-4 concentration was 0.5%.When the SO2-4 concentration was below 1%,the corrosion resistance was worse than that having no SO2-4.When the SO2-4 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.

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Effect of SO2-4 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 SO2-4 concentration was 0.5%.When the SO2-4 concentration was below 1%,the corrosion resistance was worse than that having no SO2-4.When the SO2-4 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.

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Available abstract

Effect of SO2-4 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 SO2-4 concentration was 0.5%.When the SO2-4 concentration was below 1%,the corrosion resistance was worse than that having no SO2-4.When the SO2-4 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.

Key concepts: Materials science, Pitting corrosion, Corrosion, Dielectric spectroscopy, Polarization (electrochemistry), Metallurgy, Chronoamperometry, Electrochemistry

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