Rust Characteristics and Corrosion Resistance of Q235B steel and Cr-Bearing Weathering Steel in Wenchang Marine Atmosphere
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摘要: 采用腐蚀失重法、扫描电镜（SEM）、X射线衍射（XRD）、电子探针（EMPA）等技术研究了暴露在文昌海洋大气环境中的Q235B钢和3Cr钢的锈层特征和耐蚀性。结果表明：Q235B钢的腐蚀深度大于3Cr钢的；随暴露时间的延长，两种钢的腐蚀深度均增大，大气暴露时间为1.5 a时，3Cr钢的相对腐蚀率明显下降。Q235B钢锈层存在较多裂纹，3Cr钢锈层致密，耐蚀性好。Q235B钢中Cl元素的富集降低了材料的耐蚀性，而3Cr钢中合金元素Cr富集在内锈层，Cl元素基本被阻滞在外锈层，提高了耐蚀性。Abstract: The rust layer characteristics and corrosion resistance of Q235B steel and 3Cr steel exposed to Wenchang marine atmosphere were studied by techniques such as corrosion weight loss method, scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron micro probe (EMPA). The results show that the corrosion depth of Q235B steel was greater than that of 3Cr steel. The corrosion depth of both steels increased with the extension of exposure time. When the atmospheric exposure time was 1.5 a, the relative corrosion rate of 3Cr steel decreased obviously. There were many cracks in the rust layer of Q235B steel, and the rust layer of 3Cr steel was dense and had good corrosion resistance. The enrichment of Cl in Q235B steel reduced the corrosion resistance of the material, while the alloying element Cr in 3Cr steel was enriched in the inner rust layer, and the Cl element was basically blocked in the outer rust layer, which improved the corrosion resistance of the material.
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