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The mild steel used as a rebar facing a major corrosion challenge when it exposed to different kinds of soil especially in the underground construction or buried structure, pilings etc., This study investigates metal loss of mild steel by studying the in-situ-soil parameters at the selected site . ER probe is used as a real time monitoring technique by installing in native and sea water simulated soil condition at different location below the ground level of 3,6, and 9 meters . At the laboratory,two probes have been packed in the tray with the typical soil taken from the site. Corrosion rate were measured for a period of 18 months. The steady state corrosion rate under sea water simulated soil was found to be 2.39 mpy in 3m depth. The chloride content increases the ability of electrolyte to conduct current and enhanced the corrosion process. Probe reading are not measurable count from the native soil under all depth levels. Analysis of polarization curves led to corrosion rate of coupons kept under soil extract exposed at a period of 30 days and the corrosion rate of mild steel was calculated by tafel analysis. The optical microscopic examination indicated the roughness of the surface of metal.

Corrosion Rate Monitoring of Mild Steel in Underground Soil at Different Depths Using Electrical Resistance (ER) Probe Technique