Abstract In this work the initial stages of the pitting corrosion in Q460NH weathering steel in a marine environment was studied. To elucidate the effects of inclusions modified by rare earth (RE) elements on pitting corrosion, field emission-scanning electron microscopy-energy dispersive spectrometry (FE-SEM-EDS) analyses, scanning Kelvin probe force microscopy (SKPFM) tests, and a series of immersion tests were conducted. Two main types of inclusions were formed in the steel, and different pit morphologies were observed. The pitting corrosion was initiated by the dissolution of (RE) 2 O 2 S-(RE)xSy in both types of inclusions due to the lower potential of this phase compared to the matrix, which indicated that the inclusions in the Q460NH weathering steel had a lower pitting corrosion resistance than the matrix.

中文翻译：

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稀土元素(Ce、La)改性夹杂物对Q460NH耐候钢局部海洋腐蚀的影响

摘要 本文研究了Q460NH耐候钢在海洋环境中点蚀的初始阶段。阐明稀土 (RE) 元素修饰的夹杂物对点蚀的影响、场发射扫描电子显微镜-能量色散光谱 (FE-SEM-EDS) 分析、扫描开尔文探针力显微镜 (SKPFM) 测试等一系列进行了浸没试验。钢中形成了两种主要类型的夹杂物，并观察到不同的凹坑形态。点蚀是由 (RE) 2 O 2 S-(RE)xSy 在两种类型的夹杂物中溶解引发的，因为与基体相比，该相的电位较低，这表明 Q460NH 耐候钢中的夹杂物具有耐点蚀性低于基体。