Understanding environmental impacts on initial atmospheric corrosion based on corrosion monitoring sensors

Investigation of Corrosion Behaviors on an Fe/Cu-Type ACM Sensor under Various Environments

“…As the temperature increased, the rust became more obvious. Combined with the ACM current variation in Figure 3a, the right peak of the ACM current caused by the second spray was obviously higher than that caused by the first spray for each temperature; this was caused by the promoting effect of the rust layer in forming a thicker thin liquid film during the initial stage of the corrosion [14]. The sensor surface was smooth for the first spray, but it was rusted during the second spray.…”

“…Various ACM technologies have been applied to assess the corrosivity of atmospheric environment based on different monitoring principles, such as the galvanic corrosion cell [13,14], electrochemical impedance [15][16][17], and electrical resistance [18,19] measurement. For galvanic-cell-based ACM sensors, active metals and noble metals are assembled as anodes and cathodes, respectively, in a closed cell to form galvanic couples, and a galvanometer is connected in series between the two kinds of electrodes to directly detect the galvanic current [13,14]. The corrosivity of the environment is reflected by the magnitude of the galvanic current, which is generated from the corroded sensor, instead of the substrate.…”

“…Different from the corrosion mechanism on corrosion coupons, the galvanic effect exists on the galvanic-cell-based ACM sensor. Empirically, the effectiveness of this sensor for sensitively measuring the dynamic changes of environmental corrosivity in the field has been verified [14,[20][21][22]. Mansfeld et al installed a Fe/Cu ACM sensor on the roof and observed that heavy fog significantly provoked the ACM current [20].…”

“…Mansfeld et al installed a Fe/Cu ACM sensor on the roof and observed that heavy fog significantly provoked the ACM current [20]. Pei et al employed the Fe/Cu ACM sensor under six exposure fields and found that rain contributed to 64.6-89.0% of the corrosion of the steel, which only accounted for 16.3-29.7% of the exposure time [14]. Mizuno et al and Pongsaksawad et al obtained a positive correlation between the electrical quantity output of ACM sensors and the natural corrosion rate of corrosion coupons under three outdoor environments in Thailand and some automotive environments [21,22].…”

Investigation of corrosion products formed on the surface of carbon steel exposed in Banda Aceh's atmosphere

“…However, another study shows specifically that TOW and accumulation of unwashed pollutants [ 12 ]. In low-precipitation environment and non-rainfall period, it is reported that RH plays a more significant role [ 13 ]. Furthermore, the type of atmosphere (rural vs coastal) drives the kinetics of corrosion and consequently the corrosion products and resulting metal surface (pits) [ 14 ].…”