Methodology to Improve Corrosion Rate Estimation Based on Atmospheric Corrosion Monitoring Sensors

Corrosion Monitoring in Atmospheric Conditions: A Review

“…The effect of the galvanic cell is expected to be lower if a smaller cathode and larger anode are connected. The ACM data interpretation requires careful consideration of rainfall, dew and corrosion products' formation effects [20,24]. Condensation and precipitation induce extra current, which does not corresponding to a corrosion rate increase, and has to be corrected.…”

“…Several approaches are applied to determine the current thresholds which indicate dew and rainfall. As the rainfall causes a large and rapid current increase, the conventional method defines the rainfall start as the value of current exceeding the threshold defined for the given sensor and being doubled in 10 min starting from the non-rainfall conditions [24][25][26]. The rainfall end is defined as the time when the output falls to less than a half of its previous value, or below the threshold [25,26].…”

“…The rainfall end is defined as the time when the output falls to less than a half of its previous value, or below the threshold [25,26]. The high outputs related to rainfall are multiplied with a correction coefficient also known as a cell factor or a conversion factor A Q [24][25][26].…”

Atmospheric Corrosion Monitoring Sensor in Corrosion Rate Prediction of Carbon and Weathering Steels in Thailand

“…12) Atmospheric corrosion monitoring sensor, referred to as ACM sensor, is a galvanic type sensor that has been applied in atmospheric corrosion assessment. 13) It has been employed in monitoring corrosion reactions in several applications besides atmospheric corrosion 6,14) from pipeline 15,16) to highvoltage power transmission tower. 17) When the surface of the sensor is covered with thin electrolyte, galvanic current is generated and monitored.…”

“…6,14,22) Thus, ACM sensor is an effective tool for monitoring the deposited sea salt and time of wetness on steel surface in the corrosion study. 16) This research work reports on application of ACM sensor and its performance in predicting outdoor corrosion rates of carbon and weathering steels under various environments around Thailand and relates the results to environmental factors (T, RH, RF, TOW, Cl ¹ and SO 2 ). TOW data in this study are evaluated based on two approaches: ISO-9223 1) and ACM sensor.…”