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Development of Remote-controlled Corrosion Monitoring System of Steels Using Electrochemical Impedance Method

电化学阻抗法钢材腐蚀远程监测系统的研制

基本信息

批准号：
15360383
负责人：
NISHIKATA Atsushi
金额：
$ 8.45万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

A remote-controlled monitoring system of atmospheric corrosion of steels on the basis of theory of electrochemical impedance has been developed. In the monitoring system, the impedance at two different frequencies of 10 kHz and 10 mHz is continuously and automatically measured with an Ac Corrosion Monitor (Riken Denshi). The measured data are stored in a hard disc of a computer once and regularly transferred to our laboratory using a cellular phone system.The corrosion monitoring of three different steels of ordinary carbon steel (CS), weathering steel (WS) and Ni-containing weathering steel (NiWS) was carried out at four different atmospheres, using the developed monitoring system. The comb-type probe electrodes of CS, WS and NiWS were exposed to four different sites in the distance from coastal lines. The distances were 0 km for Okinawa, 0.5 km for Futtu, 4 km for Choushi and 45 km for Tsukuba.In this atmospheric corrosion monitoring, the time of wetness (TOW) for surfaces of the ste … More els themselves was monitored from the high frequency impedance at 10 kHz, since high frequency impedance provides the solution resistance. Form the impedance difference of the low and high frequencies, the corrosion rate of the steels was monitored. The monitoring has started from September 18,2003 for Okinawa, November 11,2003 for Futtu, December 9,2003 for Choushi and December 5,2003 for Tsukuba and still continued at all sites.Both the TOW and amount of corrosion obtained from the monitoring increased in order of Tsukuba <Choushi<Futtu<Okinawa, indicating that the aggressiveness of environments increased with decreasing the distance from the coastal lines. The coupon specimens of the three steels were also exposed to the four sites together with the probes in order to measure the corrosion mass loss. The coupons were withdrawn from the exposure sites after 0.5 and 1.0 year-exposure and the mass loss was measured after removing the rusts. The results showed very high correlation between the Ac impedance monitoring data and the mass loss data. Less

基于电化学阻抗理论，研制了一种钢的大气腐蚀远程监测系统。在监测系统中，使用交流腐蚀监测仪（Riken Denshi）连续自动测量10 kHz和10 mHz两个不同频率下的阻抗。测量数据一次存储在计算机的硬盘中，并通过移动电话系统定期传输到我们的实验室。利用研制的监测系统，对普通碳钢（CS）、耐候钢（WS）和含镍耐候钢（NiWS） 3种不同钢在4种不同气氛下的腐蚀进行了监测。将CS、WS和NiWS的梳状探针电极暴露在离海岸线较远的4个不同地点。冲绳的距离为0公里，阜都为0.5公里，长市为4公里，筑波为45公里。在这种大气腐蚀监测中，从10 kHz的高频阻抗中监测了金属表面的湿润时间（TOW），因为高频阻抗提供了溶液电阻。利用低频和高频阻抗差来监测钢的腐蚀速率。冲绳的监测于2003年9月18日开始，福都的监测于2003年11月11日开始，长市的监测于2003年12月9日开始，筑波的监测于2003年12月5日开始，所有监测点仍在继续。监测所得的TOW和腐蚀量依次为筑波<长市<阜都<冲绳，表明环境的侵蚀性随距离海岸线的减小而增大。将三种钢的试样与探针一起暴露在四个地点，以测量腐蚀质量损失。在暴露0.5年和1.0年后，从暴露部位取出试样，在除锈后测量试样的质量损失。结果表明，交流阻抗监测数据与质量损失数据具有很高的相关性。少