Cu对耐候桥梁钢耐腐蚀性能的影响

采用干湿周浸实验模拟海洋大气环境研究含Cu耐候桥梁钢腐蚀过程中耐腐蚀性能的变化，并利用XRD，SEM等方法研究了两种不同Cu含量耐候桥梁钢的锈层变化．结果表明：Cu能够有效地降低钢的平均腐蚀深度和腐蚀速率，利于提高钢的耐蚀性能．锈层组成随腐蚀时间而变化，腐蚀初期锈层主要由Fe3O4和γ—FeOOH组成，腐蚀中期锈层开始生成Ni（0.6-1）Fe（2.4-2）O4尖晶石类复合氧化物和α-FeOOH两种晶相；腐蚀后期组成基本保持不变，主要由Ni（0.6-1）Fe（2.4-2）O4、α—FeOOH、γ—FeOOH和少量Fe3O4组成．

Effect of Cu on corrosion resistance performance of bridge weathering steels

Corrosion resistance performance of Cu - containing bridge weathering steels under marine atmosphere was studied by cyclic wet/dry corrosion test and the effect of Cu on the rust layer was also investigated by XRD and SEM method. The results showed that, the corrosion depths and corrosion rates both decreased with the increase of Cu in the experimental steels. The corrosion rates increased quickly before 48 h then kept constant and after 96 h decreased with corrosion time. The crystalline constituents of the rust layer evolved with corrosion time. Initially, the rust layer was roughly composed of Fe304 and γ - FeOOH which changed to Ni（0.6-1） Fe（2.4-2） 04 , α - FeOOH and γ - FeOOH in the middle of the corrosion process. The rust eventually consisted of Ni（0.6-1） Fe（2.4-2） 04 , α - FeOOH, γ - FeOOH and Fe3O4 in minor fraction.