海洋潮差区碳钢动态水线腐蚀行为与作用机理研究

Marine tidal zone corrosion (MTZC) has significantly influenced on the performance and life span of the engineering facilities in marine condition, and has been paid close attention for a long time. The main characteristic of MTZC is the maximum corrosion under MLT(mean low tide), and its cause is not clear until new.. The applicant has found out the structure of waterline zone composed of gas/liquid film/liquid, and the important role of the liquid film in waterline corrosion. MTZC is a type of dynamic waterline corrosion. The fluctuating of the liquid film above waterline caused by tiding drives the corrosion electrodes process dynamically up-down moving synchronously, which accelerates the whole corrosion process. The waterline dynamic process, meanwhile, may be the key factor causing the maximum corrosion under MLT. The applicant suggested, therefore, using the simulation device of dynamic waterline state combined Z-array electrodes and multi-electrochemical techniques, to study the effects of the process of the dynamic waterline on the responses of cathodic and anodic dynamic processes of the corrosion and its function in the developing course of the localized corrosion with the feature of big cathode and small anode(BC&SA). It not only contributes to illuminating the effects of dynamic waterline process on the corrosion environment state of the waterline zone and the dynamic corrosion behavior of the electrodes, and to ascertaining the limiting-competing asymmetric interaction between the cathode and anode of the corrosion process in dynamic waterline environment and the function of dynamic waterline process in the BC&SA localized corrosion development, and to clarifying the mechanism of maximum corrosion under MLT, but also contributes to realizing deeply the influences of alternate cathodic/anodic polarization on the behavior of material corrosion. In addition, the research work is also conductive to the development of the basic corrosion electrochemical theory involved with the process of even corrosion to uneven corrosion then to localized corrosion.

海洋潮差区腐蚀对海洋工程设施服役寿命有重要影响。常见低潮线腐蚀峰是海洋潮差区腐蚀行为重要特征，其成因尚存疑。.近期发现水线区具有气相/液膜相/液相三相结构，液膜相在水线腐蚀中具有重要作用。海洋潮差区腐蚀是动态水线腐蚀之一。潮汐水线移动带动液膜区及腐蚀电极过程同步动态移动而加速腐蚀过程，动态水线环境的作用是影响低潮线腐蚀峰行为关键。建议采用动态水线模拟腐蚀实验技术结合Z阵列电极电化学方法研究动态水线过程对腐蚀阴极和阳极动态响应行为影响及其在大阴极小阳极局部腐蚀发展进程中作用。本研究有助于阐明动态水线过程影响水线腐蚀环境状态和腐蚀电极动态行为特征，查明动态水线过程腐蚀阴极和阳极间限制-竞争非对称交互效应及其在大阴极小阳极局部腐蚀发展历程中作用，理解潮差区腐蚀阳极峰形成机理，有助于认识阴阳极交替极化对材料耐蚀性影响和动态环境在材料全面腐蚀→不均匀腐蚀→局部腐蚀进程中作用等腐蚀电化学基础理论问题。

海洋潮差区腐蚀对海洋工程设施服役寿命有重要影响。常见低潮线腐蚀峰是海洋潮差区腐蚀行为重要特征，其成因尚存疑。.近期发现水线区具有气相/液膜相/液相三相结构，液膜相在水线腐蚀中具有重要作用。海洋潮差区腐蚀是动态水线腐蚀之一。潮汐水线移动带动液膜区及腐蚀电极过程同步动态移动而加速腐蚀过程，动态水线环境的作用是影响低潮线腐蚀峰行为关键。建议采用动态水线模拟腐蚀实验技术结合Z阵列电极电化学方法研究动态水线过程对腐蚀阴极和阳极动态响应行为影响及其在大阴极小阳极局部腐蚀发展进程中作用。本研究有助于阐明动态水线过程影响水线腐蚀环境状态和腐蚀电极动态行为特征，查明动态水线过程腐蚀阴极和阳极间限制-竞争非对称交互效应及其在大阴极小阳极局部腐蚀发展历程中作用，理解潮差区腐蚀阳极峰形成机理，有助于认识阴阳极交替极化对材料耐蚀性影响和动态环境在材料全面腐蚀→不均匀腐蚀→局部腐蚀进程中作用等腐蚀电化学基础理论问题。