An electrochemical method for characterizing the structure of double-layer capacity

IF 2.3 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Xilin Xiong, Na Zhang, Tong Niu, Quan Wu
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Abstract

Purpose The relation between metal corrosion behavior and double-layer capacity remains unclear. This study aims to put forward a novel method to measure double-layer capacity. Design/methodology/approach A novel model based on generalized Frumkin–Butler–Volmer equation was put forward. Combining this model with potentiodynamic polarization test and electrochemical impedance spectroscopy, the structure of double-layer capacity can be characterized. Findings This study found that the corrosion rate of iron increased with NaCl solution concentration and temperature at the experimental range, but an essential difference existed. The capacity of the diffuse layer and Stern layer increased with temperature and decreased with NaCl solution concentration. The ratio of diffuse layer capacity and Stern layer capacity influences the corrosion rate directly, which can be regarded as one of the judging criteria for corrosion resistance of metal materials. Originality/value The convenient means of double-layer structure characterization is still blank. With this method, the corrosion behavior of metal materials can be further analyzed, especially in high-temperature and pressure environments.
表征双层容量结构的电化学方法
目的金属腐蚀行为与双层容量之间的关系尚不清楚。本研究旨在提出一种测量双层容量的新方法。设计/方法/方法基于广义Frumkin-Butler-Volmer方程提出了一种新的模型。将该模型与动电位极化测试和电化学阻抗谱相结合,可以表征双层容量的结构。本研究发现,在实验范围内,铁的腐蚀速率随NaCl溶液浓度和温度的增加而增加,但存在本质差异。扩散层和斯特恩层的容量随温度升高而增大,随NaCl溶液浓度的升高而减小。扩散层容量与斯特恩层容量的比值直接影响腐蚀速率,可作为金属材料耐腐蚀性能的判断标准之一。双层结构表征的便捷手段尚属空白。利用这种方法,可以进一步分析金属材料的腐蚀行为,特别是在高温和高压环境下。
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来源期刊
Anti-corrosion Methods and Materials
Anti-corrosion Methods and Materials 工程技术-冶金工程
CiteScore
2.80
自引率
16.70%
发文量
61
审稿时长
13.5 months
期刊介绍: Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.
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