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首页> 外文期刊>Journal of Materials Engineering and Performance >Use of Electrochemical Noise (EN) Technique to Study the Effect of sulfate and Chloride Ions on Passivation and Pitting Corrosion Behavior of 316 Stainless Steel
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Use of Electrochemical Noise (EN) Technique to Study the Effect of sulfate and Chloride Ions on Passivation and Pitting Corrosion Behavior of 316 Stainless Steel

机译：使用电化学噪声（EN）技术研究硫酸根和氯离子对316不锈钢的钝化和点腐蚀行为的影响

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摘要

In the present paper, studies were conducted on AISI Type 316 stainless steel (SS) in deaerated solutions of sodium sulfate as well as sodium chloride to establish the effect of sulfate and chloride ions on the electrochemical corrosion behavior of the material. The experiments were conducted in deaerated solutions of 0.5 M sodium sulfate as well as 0.5 M sodium chloride using electrochemical noise (EN) technique at open circuit potential (OCP) to collect the correlated current and potential signals. Visual records of the current and potential, analysis of data to arrive at the statistical parameters, spectral density estimation using the maximum entropy method (MEM) showed that sulfate ions were incorporated in the passive film to strengthen the same. However, the adsorption of chloride ions resulted in pitting corrosion thereby adversely affecting noise resistance (R N). Distinct current and potential signals were observed for metastable pitting, stable pitting and passive film build-up. Distinct changes in the values of the statistical parameters like R N and the spectral noise resistance at zero frequency (R°SN) revealed adsorption and incorporation of sulfate and chloride ions on the passive film/solution interface.
机译：在本文中，对AISI 316不锈钢（SS）在硫酸钠和氯化钠的脱气溶液中进行了研究，以确定硫酸盐和氯离子对材料电化学腐蚀行为的影响。在开路电势（OCP）下使用电化学噪声（EN）技术在0.5 M硫酸钠和0.5 M氯化钠的脱气溶液中进行实验，以收集相关的电流和电势信号。目视记录电流和电势，分析数据以得出统计参数，使用最大熵方法（MEM）进行光谱密度估算表明，硫酸盐离子被掺入钝化膜中以增强强度。然而，氯离子的吸附导致点蚀，从而对抗噪声性（R N ）产生不利影响。在亚稳点蚀，稳定点蚀和无源膜堆积方面观察到明显的电流和电位信号。统计参数值的明显变化和零频率下的抗频谱噪声能力（R°SN ）表明，在被动薄膜/溶液界面上有硫酸根和氯离子的吸附和结合。

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    M.G. Pujar; T. Anita; H. Shaikh; R.K. Dayal; H.S. Khatak;

  • 作者单位

    Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu India;

    Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu India;

    Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu India;

    Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu India;

    Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research Kalpakkam 603 102 Tamil Nadu India;

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    316SS; adsorption; chloride; electrochemical noise; passive film; sulfate;

    机译：316SS;吸附;氯化物;电化学噪声;钝化膜;硫酸盐;

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