Corrosion Monitoring of Weathering Steel Bridges by Electrochemical Impedance Method

用电化学阻抗法对两座不同的风化桥梁--奈比基大桥(Niigata)和龙国大桥(Fukuyama)--的耐候钢腐蚀进行了两年的监测。10 MHz(1/Z10 mHz)低频阻抗倒数的平均值与腐蚀失重测量得到的平均腐蚀速率有很好的相关性。相关方程为：(Icorr/μ)=17.7×(Z10 mHz/Ωcm^2)^&lt；-0。16&gt；

Corrosion monitoring of weathering steel has been carried out for two years at two different weathering bridges, Naebiki bridge(Niigata) and Ryogoku bridge(Fukuyama) by electrochemical impedance method. Average values of reciprocal of low frequency impedance at 10mHz(1/Z10mHz) well correlate with average corrosion rate obtained by corrosion weight loss measurements. The correlation equation was obtained as follows :(Icorr/μAcm^<-2>)=17. 7×(Z10mHz/Ωcm^2)^<-0. 16>.