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Quantitative micro-electrochemical study of duplex stainless steel 2205 in 3.5wt%NaCl solution

International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2053-2063页

作者： Shuangyu Cai Keke Lu Xinnan Li Lei Wen Feifei Huang Ying Jin National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Nuclear Equipment Division Beijing Institute of Nuclear EngineeringChina Nuclear Power Engineering Co.Ltd.Beijing 100840China Innovation Group of Marine Engineering Materials and Corrosion Control Southern Marine Science and Engineering Guangdong LaboratoryZhuhai 519080China

Duplex stainless steels(DSSs)are suffering from various localized corrosion attacks such as pitting,selective dissolution,crevice corrosion during their service period.It is of great value to quantitatively analyze and grasp the micro-electrochemical corrosion behavior and related mechanism for DSSs on the micrometer or even smaller scales.In this work,scanning kelvin probe force microscopy(SKPFM)and energy dispersive spectroscopy(EDS)measurements were performed to reveal the difference between the austenite phase and ferrite phase in microregion of DSS 2205.Then traditional electrochemical impedance spectroscopy(EIS)and potentiodynamic polarization(PDP)tests were employed for micro-electrochemical characterization of DSS 2205 with different proportion phases inϕ40 andϕ10μm micro holes.Both of them can only be utilized for qualitative or semi-quantitative micro-electrochemical characterization of DSS 2205.Coulostatic perturbation method was employed for quantitative micro-electrochemical characterization of DSS 2205.What is more,the applicable conditions of coulostatic perturbation were analyzed in depth by establishing a detailed electrochemical interface circuit.A series of microregion coulostatic perturbations for DSS 2205 with different proportion phases inϕ10μm micro holes showed that as the austenite proportion increases,the corresponding polarization resistance of microregion increases linearly.

关键词： duplex stainless steel 2205 quantitative micro-electrochemical study electrochemical impedance spectroscopy coulostatic perturbation scanning kelvin probe force microscopy

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Sodium dodecyl sulfate (SDS) as an effective corrosion inhibitor for Mg-8Li-3Al alloy in aqueous NaCl: A combined experimental and theoretical investigation

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Journal of Magnesium and Alloys 2023年第1期11卷 287-300页

作者： Honggun Song Zhidong Xu Lahouari Benabou Zheng Yin Hongyu Guan Hong Yan Luo Chao Zhi Hu Xudong Wang Department of Mechanical and Electrical Engineering Nanchang UniversityNanchang330031China UniversitéParis-Saclay UVSQLISV78124Vélizy-VillacoublayFrance Institute for Advanced Study Nanchang UniversityNanchang330031China

The corrosion inhibition behavior of Mg-8Li-3Al alloy in NaCl solution with sodium dodecyl sulfate(SDS)was investigated by hydrogen analysis,scanning electron microscopy(SEM),electrochemical test,scanning kelvin probe force microscopy(SKPFM)and computational methods.Results showed that the corrosion resistance of Mg-8Li-3Al alloy in NaCl solution was effectively improved with SDS.The SEM and SKPFM results confirmed a dense,200 nm-thick SDS-adsorbed layer had formed on the alloy surface.The separation energy ΔE_(gap) and adsorption energy E_(ads) of SDS on the Mg surface were calculated by density functional theory and molecular dynamics simulations,respectively.And the corrosion inhibition mechanism was hypothesized and described.

关键词： Mg-Li alloy Corrosion Sodium dodecyl sulfate scanning kelvin probe force microscopy Density functional theory Molecular dynamics

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