Analysis Of Atmospheric Corrosion Monitoring Technology In Wuhan Atmospheric Environment

Traditional corrosion monitoring and corrosion assessment methods can no longer meet the requirements for data volume,data reliability and data continuity in practice.At present,the online monitoring technology of atmospheric corrosion is developing rapidly,but the accuracy and applicability of the data during the use process need to be solved urgently.Based on this,this article has carried out research on the accuracy and applicability of the monitoring data of the galvanic ACM instrument and the resistance ACM instrument in the Wuhan atmospheric environment.(1)At the Wuhan National Field Science Observatory for Atmospheric Environmental Material Corrosion,test one-year periodic samples.At the same time,two types of online atmospheric corrosion monitors were placed on the original site.The samples were recovered and the data analysis found that in the Wuhan atmospheric environment,the resistance type The corrosion rate of the ACM instrument is 1.3 times that of the coupon method,and the corrosion rate of the corrosion coupon method is 1.8 times that of the galvanic ACM;the rust layer of the recovered sample is analyzed by EDS energy spectrum analysis and X-ray diffraction technology It is found that there are no S and Cl elements in the rust layer,the main component of the rust layer is?-Fe OOH,and the Q235 carbon steel undergoes uniform corrosion.In the Wuhan atmospheric environment,the resistance-type ACM instrument is more applicable than the galvanic-type ACM instrument.At the same time,the respective response surface models were established based on the corrosion monitoring data.The results of the indoor verification test showed that the response surface models of the resistive ACM and the galvanic ACM were significantly feasible.(2)In the indoor simulated marine industrial environment,the average corrosion rate obtained by the galvanic ACM instrument is almost equal to the corrosion rate calculated by the corrosion coupon method.The average corrosion rate monitored by the resistance-type ACM instrument is 1.5 times that of the corrosion coupon method.That is,in the marine industrial environment,the galvanic ACM corrosion monitor has better applicability than the resistance ACM corrosion monitor.Cl^-causes cracks and delamination in the rust layer,resulting in many corrosion pits,and the pitting coefficient becomes larger,resulting in the corrosion monitoring data of the resistance type ACM instrument is relatively high.(3)Through exploring the effect of different ratios of SO₂ and Cl^-on the correlation coefficient of the two corrosion monitoring technologies,it is found that as the concentration of SO₂ increases,the corrosion will develop in the direction of uniform corrosion.At the same time,the resistance type ACM instrument the correlation coefficient of ACM decreases,and the resistance type ACM instrument can be well applied in the industrial atmosphere with serious SO₂ pollution.