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采用干湿交替周期浸润腐蚀实验和场发射扫描电镜研究了非金属夹杂物对Q450NQR1耐候钢在工业性大气环境中耐候性的影响。结果表明,夹杂物变性处理明显提高了耐候钢前期的耐腐蚀性能,但对稳定性锈层形成之后的耐腐蚀性能基本没有影响;经过稀土处理后的非金属夹杂物主要为稀土氧化物和硫化物与Al2O3的复合夹杂,添加Si-Ca线变性后的非金属夹杂物主要为Ca的氧化物和硫化物与Al2O3的复合夹杂,这些夹杂物在0.01 mol·L-1的Na HSO3介质中均表现为阳极性夹杂,在腐蚀微电池中作为阳极优先溶解,钢基体则作为阴极被保护起来,腐蚀速度减缓。
The effects of non-metallic inclusions on the weatherability of Q450NQR1 weathering steel in industrial atmosphere were studied by wet-wet alternating periodic immersion corrosion test and field emission scanning electron microscopy. The results show that the inclusion denaturation treatment significantly improves the corrosion resistance of the weathering steel at the early stage, but has no effect on the corrosion resistance after the formation of the stability rust layer. The non-metallic inclusions after rare earth treatment are mainly rare earth oxides and sulfides Al 2 O 3 composite inclusions, and the non-metallic inclusions modified by Si-Ca were mainly composed of the Ca oxides and the complex inclusions of sulfide and Al 2 O 3. These inclusions were uniformly dispersed in 0.01 mol·L -1 Na HSO 3 medium The performance of the anode inclusions, in the corrosion of micro-batteries as the anode preferentially dissolved, the steel substrate is protected as a cathode, the corrosion rate slowed.