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引用次数: 0
摘要
设计/方法/方法采用等效电路模型进行瞬态分析,并根据耦合电极的相对瞬时阴极电阻以及电化学极化测量得出的动力学参数,使用局部电流分配规则进行分析。研究结果 SS 316 L 产生的电化学瞬时电流的形状和大小受到薄膜稳定性、局部阳极溶解动力学和耦合电极间阴极动力学对称性的影响,其中超长瞬时电流可能与阳极溶解速率较慢的薄膜损伤传播相对应。瞬态电流增长最后阶段的动态阴极电阻可以作为一个特征参数,反映被动薄膜保护的丧失。原创性/价值对局部阳极电流轨迹的估计为与整个局部腐蚀过程中涉及的电荷、局部电流密度和薄膜电阻变化相关的单独电化学瞬态分析开辟了一条新途径。
Transient analysis of the electrochemical noise arising from the stainless steel local anodic events by the equivalent circuit approach
Purpose
This study aims to investigate the individual electrochemical transients arising from local anodic events on stainless steel, to uncover the potential mechanisms producing different types of transients and to derive appropriate parameters indicative of the corrosion severity of such transient events.
Design/methodology/approach
An equivalent circuit model was used for the transient analysis, which was performed using a local current allocation rule based on the relative instant cathodic resistance of the coupled electrodes, as well as the kinetic parameters derived from the electrochemical polarization measurement.
Findings
The shape and size of the electrochemical current transients arising from SS 316 L were influenced by the film stability, local anodic dissolution kinetics and the symmetry of the cathodic kinetics between the coupled electrodes, where the ultralong transient might correspond to the propagation of film damage with a slow anodic dissolution rate. The dynamic cathodic resistance during the final stage of transient current growth can serve as a characteristic parameter that reflects the loss of passive film protection.
Originality/value
Estimation of the local anodic current trace opens a new way for individual electrochemical transient analysis associated with the charges involved, local current densities and changes in film resistance throughout localized corrosion processes.
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.