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对耐候钢和Q235B开展了周期浸润腐蚀试验,并对试样进行了检测分析。金相、扫描电镜(SEM)检测结果显示耐候钢的锈层较薄,与基体结合紧密。X射线衍射分析结果表明,耐候钢锈层中主要是α-FeOOH,这是耐大气腐蚀性能更好的主要原因。EPMA成分扫描分析显示,对耐候性有益的元素Cu、Cr、P、Si在锈层中富集,促进了结构较致密的α-FeOOH的生成,成为保护层;同时,提高了锈层和基体的结合和粘附性,防止在长时间的腐蚀中锈层剥落,提高了耐大气腐蚀性。
Periodic infiltration corrosion test was carried out on weathering steel and Q235B, and the samples were tested and analyzed. Metallographic examination and scanning electron microscopy (SEM) showed that the rust layer of weathering steels was thin and tightly bonded to the substrate. The results of X-ray diffraction analysis showed that α-FeOOH is the main rust-resistant layer of weathering steel, which is the main reason for better atmospheric corrosion resistance. The results of EPMA scanning show that Cu, Cr, P and Si, which are beneficial to weatherability, are enriched in the rust layer and promote the formation of denser a-FeOOH structure. At the same time, the rust layer and the matrix Of the combination and adhesion, to prevent rust corrosion in a long time peeling, improved resistance to atmospheric corrosion.