The effects of inclusions on localized corrosion of Zr–Ti deoxidized low-alloy steels in marine environment were investigated by various analytical techniques including scanning electron microscopy with X-ray microanalysis (SEM/EDS), confocal Raman microscopy (CRM), and in situ scanning vibrating electrode technique (SVET). It was found that complex (Zr, Ti, Al)-O_x inclusions were responsible for the initiation of localized corrosion. Localized corrosion preferentially occurred at Fe matrix adjacent to these inclusions and formed micro-gaps. In the early stage of corrosion, catalytic-occluded cells and the diffusion of chloride ions played a major role in the propagation of corrosion, further accelerating the dissolution of Fe matrix and (Zr, Ti, Al)-O_x inclusions. Combining SVET and CRM results, it revealed that the maximum anodic current density in local area gradually decreased with prolonged exposure time, indicating that corrosion products covered the steel surface and lowered the propagation rate of corrosion. In the later stage of corrosion, the barrier effect of corrosion products played an important role in inhibiting localized corrosion.

通过各种分析技术研究了夹杂物对Zr-Ti脱氧低合金钢在海洋环境中局部腐蚀的影响，包括扫描电子显微镜，X射线显微分析（SEM / EDS），共聚焦拉曼显微镜（CRM）和原位分析扫描振动电极技术（SVET）。发现复杂的（Zr，Ti，Al）-O _x夹杂物是引起局部腐蚀的原因。局部腐蚀优先发生在与这些夹杂物相邻的Fe基体上，并形成微间隙。在腐蚀的早期阶段，催化吸附的细胞和氯离子的扩散在腐蚀的传播中起主要作用，进一步促进了铁基体和（Zr，Ti，Al）-O _x的溶解夹杂物。结合SVET和CRM结果，揭示了局部最大阳极电流密度随着暴露时间的延长而逐渐降低，表明腐蚀产物覆盖了钢表面，降低了腐蚀的传播速率。在腐蚀的后期，腐蚀产物的阻隔作用在抑制局部腐蚀中起着重要作用。