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采用双辊薄带铸轧机制备出P含量高达0.15 mass%(下同)的高P耐候钢薄带,发现磷偏析于薄带表面,经冷轧和退火处理后在薄带表面形成一均匀的富P层.通过实验室加速腐蚀试验研究了磷的表面逆偏析对高P薄带耐候性能的影响.结果表明,在120周期的加速腐蚀后,与P含量为0.080%的常规耐候钢相比,高P薄带锈层增重量减少31%;在高P薄带的锈层和基体之间形成了致密的腐蚀阻挡层,降低了腐蚀速度,提高了薄带的耐候性能.
A high P weathering steel strip with P content up to 0.15 mass% was prepared by twin roll strip casting and found to segregate on the surface of the strip. After cold rolling and annealing, a uniform Enriched layer P. The effect of surface reverse segregation of phosphorus on the weatherability of high-P strip was investigated by laboratory accelerated corrosion test.The results showed that after 120 cycles of accelerated corrosion, compared with conventional weathering steel with 0.080% P content , The weight of the high-P thin-film rust layer decreased by 31%. A dense corrosion barrier was formed between the rust layer and the substrate in the high-P thin strip, reducing the corrosion rate and improving the weatherability of the thin strip.