Ni对Q690qENH耐候桥梁钢在模拟工业大气中腐蚀行为的影响  

Effect of Ni on corrosion behavior of Q690qENH weathering bridge steel in simulated industrial atmosphere

作　　者：程鹏 周庆军 白会平 黄先球 庞涛 李江文 CHENG Peng;ZHOU Qingjun;BAI Huiping;HUANG Xianqiu;PANG Tao;LI Jiangwen(Baosteel Central Research Institute(Wuhan Iron and Steel Co.,Ltd.,Technical Center),Wuhan 430081,Hubei,China)

机构地区：[1]宝钢股份中央研究院(武钢有限技术中心),湖北武汉430081

出　　处：《钢铁研究学报》2025年第2期217-226,共10页Journal of Iron and Steel Research

摘　　要：为研发和推广应用新型耐候桥梁钢,采用周浸加速腐蚀实验和电化学测试方法,结合扫描电子显微镜(SEM)、X射线衍射(XRD)、电子探针(EPMA)和X射线光电子能谱(XPS),研究了Ni对Q690qENH耐候桥梁钢在工业大气环境中腐蚀行为的影响。结果表明,Ni的添加可以提高Q690qENH钢在工业大气环境下的耐蚀性。添加Ni可以提高Q690qENH钢的自腐蚀电位,增大锈层电阻。Ni在锈层中均匀分布,主要以NiFe_(2)O_(4)的形式存在。NiFe_(2)O_(4)一方面提高了锈层的离子选择性,阻挡了SO_(2)向基体渗透;另一方面促进了锈层中γ-FeOOH向α-FeOOH的转化。随着Ni质量分数从0.31%增加到0.52%,锈层中S的富集量明显减少,Q690qENH钢的锈层保护指数α/γ*值增大,腐蚀速率降低,耐蚀性提高。To develop and promote the application of new weathering bridge steel,the effect of Ni on the corrosion behavior of Q690qENH weathering bridge steel in industrial atmosphere was studied by using the accelerated corrosion test and electrochemical test methods,combined with scanning electron microscopy(SEM),X-ray diffraction(XRD),electron probe(EPMA)and X-ray photoelectron spectroscopy(XPS).The results show that the addition of Ni can improve the corrosion resistance of Q690qENH steel in industrial atmosphere.The addition of Ni can improve the self-corrosion potential of Q690qENH steel and increase the resistance of rust layer.Ni is distributed uniformly in the rust layer,mainly in the form of NiFe_(2)O_(4).On the one hand,NiFe_(2)O_(4)improves the ion selectivity of the rust layer and prevents SO_(2)from penetrating into the substrate.On the other hand,it promotes the transformation ofγ-FeOOH toα-FeOOH in the rust layer.With the increase of Ni content from 0.31%to 0.52%,the enrichment of S in the rust layer decreases obviously,the protection indexα/γ*value of the rust layer of Q690qENH steel increases,the corrosion rate decreases,and the corrosion resistance improves.

关 键 词：耐候桥梁钢 NI 工业大气腐蚀 锈层 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]