Corrosion assessment of carbon steel in Thailand by atmospheric corrosion monitoring (ACM) sensors
AbstractAtmospheric corrosion of metal depends on material compositions, weather condition (dry, dew, and rain period), temperature, relative humidity, and airborne sea salt of specific location. General testing procedure to obtain the corrosion rate is by actual exposure test of the specimen panels based on time interval plan. In Japan, atmospheric corrosion monitoring (ACM) sensor, made of an iron-silver galvanic couple, has been developed and used to sense the corrosivity in terms of galvanic current. Under some atmospheric conditions, these data can be converted to time of wetness and related to the corrosion rate of carbon steel. With ACM sensors, it is possible to monitor the corrosion rate in a shorter time than the exposure test. To apply the ACM sensors in Thailand, it is necessary to evaluate the effectiveness and correlation between the actual corrosion rate and the sensor output. In this research during June 2007 â€“ May 2009, we performed exposure tests of carbon steel (JIS SS400) along with ACM sensors under outdoor and sheltered conditions at three locations: (1) Rama VI Road, Bangkok (2) Suvarnabhumi International Airport, Samutprakarn and (3) Royal Thai Navy Dockyard, Chonburi, representing urban, airport, and marine environments, respectively. Weather data were obtained from temperature, relative humidity, and ACM sensors. To estimate the corrosion rate, weight loss measurements were carried out on specimens exposed for 1 month period over 2 years. Average monthly weight loss ranks from high to low as marine, airport, and urban environments. The relationship between outdoor corrosion rate and ACM output is found to be linear on a log-log scale at airport and urban test stations during March 2008 â€“ May 2009.
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