对自制的锑、铝复合添加Cr-Ni-Cu系耐候钢(1^#)、含铝Cr-Ni-Cu系耐候钢(2^#),市购S450AW含锑耐候钢、Q450EWR1高铬耐候钢以及Q355B低合金钢进行周期浸润腐蚀试验,对比研究了5种钢的耐腐蚀性能以及表面锈层的结构和物相组成,分析了锑和铝元素对耐腐蚀性能的影响。结果表明:4种耐候钢表面锈层均含有高含量α-FeOOH、Fe₃O₄和α-Fe₂O₃等具有保护作用的物相,耐腐蚀性能均优于Q355B低合金钢;1^#钢内锈层出现硅、铬、铜、锑、铝元素的富集,2^#钢内锈层出现硅、铝元素的富集,这些元素的富集提高了内锈层的耐腐蚀性能;1^#钢和2^#钢、S450AW钢的耐腐蚀性能相近,说明复合添加锑和铝可以在保证耐候钢良好耐腐蚀性能的同时减少铝、锑、铬元素的单独添加量。

Periodic wet/dry corrosion tests were conducted on the self-made Sb-Al composite added Cr-Ni-Cu series weathering steel (1^#) and Al-containing Cr-Ni-Cu series weathering steel (2^#), and commercially available S450AW Sb-containing weathering steel, Q450EWR1 high Cr weathering steel and Q355B low alloy steel. The corrosion resistance of the five steels and the structure and phase composition of the surface rust layers were compared and studied. The influence of Sb and Al elements on the corrosion resistance was analyzed. The results show that the surface rust layers of the four weathering steels contained high content protective phases including α-FeOOH, Fe₃O₄ and α-Fe₂O₃; the corrosion resistance was better than that of Q355B low alloy steel. The inner rust layer of 1^# steel was enriched with Si, Cr, Cu, Sb, and Al elements, and the inner rust layer of 2^# steel was enriched with Si and Al elements; the enrichment of these elements improved the corrosion resistance of the inner rust layer. The corrosion resistance of 1^# steel, 2^# steel and S450AW steel was similar, indicating that the composite addition of Sb and Al could ensure the good corrosion resistance of weathering steels while reducing the single addition of Al, Sb, and Cr elements.