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

Abstract

Galvanic type atmospheric corrosion monitoring (ACM) sensors can distinguish wet and dry conditions of a surface by reporting spiked charge when there is an electrolyte film on the sensor. In this study, FeAg type ACM sensor was exposed to monitor time of wetness (TOW ACM ) on carbon steel and weathering steel coupons at seven test stations in Thailand. Climate parameters were monitored by weather stations. Chloride and sulfur dioxide deposition rates were obtained by dry gauze and lead dioxide cylinder methods, respectively. The objective was to investigate the effects of TOW ACM , climate, and aerosols on corrosion rate in Thailand tropical climate under high temperature, high relative humidity, and frequent monsoon-induced rainfalls. Multivariable linear regression model applied on the first-year corrosion rate yielded predictive equations for (1) inland areas-as a function of temperature (T) and relative humidity (RH) and (2) coastal areas-as a function of rainfall (RF) with TOW ACM or chloride (Cl ¹ ) deposition rate. The first corrosion map of Thailand was proposed based on the predictive equations for corrosion rates of carbon steel and weathering steel.

Atmospheric corrosion of carbon steel: Results of one-year exposure in an andean tropical atmosphere in Colombia

“…Fig. 3 depicts a TOW behavior typical of tropical regions [ 7 ]. Particularly, Valle de Aburrá is classified as a humid tropical zone and has been experiencing unexpected increases in rainfall in recent years.…”

“…The corrosion process involves numerous site-specific variables, including the Time of Wetness (TOW), which is influenced by meteorological factors such as temperature and relative humidity. In addition, the presence of atmospheric elements such as SO 2 and chlorides accelerates atmospheric corrosion [ [5] , [6] , [7] ]. It is well known that corrosion rates of metals in the atmosphere may vary by tens or even hundreds of times depending on their location [ 8 ].…”

Real‐time corrosion monitoring of aluminium alloys under chloride‐contaminated atmospheric conditions

“…In the literature, different corrosion monitoring methods have been developed for atmospheric conditions: quartz crystal microbalance (QCM), [16][17][18] optic fibre-based sensors (OFCS), [19,20] acoustic emission (AE), [21][22][23] linear polarisation resistance (LPR), [24,25] atmospheric corrosion monitor (ACM), [26][27][28] electrochemical impedance spectroscopy (EIS), [25,29,30] electrical resistance (ER) [31][32][33][34][35][36][37][38][39][40][41] and radiofrequency (RF). [42][43][44] QCM, OFCS and RF methods rely on the use of thin metallic films, usually deposited by physical vapour deposition and are thus, not compatible with industrial materials and aggressive environments.…”