Field Study of Weather Conditions Affecting Atmospheric Corrosion by an Automobile-Carried Atmospheric Corrosion Monitor
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Field Study of Weather Conditions Affecting Atmospheric Corrosion by an Automobile-Carried Atmospheric Corrosion Monitor Sensor Yan-liang Huang, Dan Yang, Yong Xu, Dong-zhu Lu, Li-hui Yang, and Xiu-tong Wang (Submitted April 6, 2020; in revised form July 31, 2020; published online September 15, 2020) The atmospheric corrosion of iron and steels not only affects the safety of infrastructures but also destroys the appearances and ornamental appreciations. The corrosivity of an environment can suggest such information that is useful for corrosion protection design and maintenance. The classical exposure test method is applicable to the evaluation of atmospheric corrosivity, but it takes a long time and canÕt tell the evolution of corrosivity over a period of time. Atmospheric corrosion monitor (ACM) has been proved to be an effective method to investigate the corrosivity of atmospheric environment. However, unfortunately, the experiences of the authors of this paper show that the output by measuring current is interfered by the noise when the sensor is dry, and it is often difficult to differentiate it from the background signals, while the corrosion process is still going on the sensor surface. In this paper, a Fe-Zn ACM sensor was modified by connecting a larger resistor in parallel and measuring the electromotive force. Laboratory experiments and field tests revealed the influence of temperature, RH and rainfall on the ACM outputs, verifying the applicability of the modified sensor for the monitoring of the corrosivity variations in a region. Keywords
atmospheric corrosion monitor, corrosion sensors, rainfall, relative humidity, temperature
1. Introduction Iron and steel materials widely used in engineering constructions suffer corrosion and damage in atmospheric environments, affecting the safety of infrastructures (Ref 1-6). At the same time, corrosion seriously destroys the appearance of structures, resulting in a significant decrease in ornamental appreciation, especially for tourist cities and scenic spots. According to statistics, the corrosion cost of materials accounts for 3.34% of GDP (Ref 7), and the economic loss caused by atmospheric corrosion accounts for more than half of it (Ref 8). So, the atmospheric corrosion research is paid great attention. The atmospheric corrosion survey was conducted in 523 cities for 25 years in the USA, and atmospheric corrosivity
Yan-liang Huang, Dong-zhu Lu, Li-hui Yang, and Xiu-tong Wang, Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Open Studio for Marine Corrosion and Protection, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; and Dan Yang and Yong Xu, Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Open Studio for Marin
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