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Abstract

The corrosion behavior of heat treated mild steel in 0.1 M citric acid was studied using weight loss technique. Mild steel samples were   heated at 650 and 950 ºC for 30, 60 and 90 min. The effect of heat treatment time and methods of cooling (normalizing, quenching and stress relief) on the corrosion resistance of mild steel in 0.1 M citric acid solution was also studied. The experimental results showed that the corrosion rates of the heat treated mild steel increased with time of heating irrespective of the cooling method used. The corrosion rates of samples treated at 650 ºC and 950 ºC at 30 and 90 min, respectively decreased with increase in weight loss. Also, the corrosion rate of mild steel treated at 950 ºC (normalizing and quenching) for 30 min were higher than those treated at 650 ºC  normalizing and quenching) for 30 min. However, the samples cooled using stress relief method at 650 ºC showed higher corrosion rates compared to that at 950 ºC. The corrosion rates of mild steel treated at 650 ºC for 90 min, exhibited lower corrosion rate than  hose treated at 950 ºC for 90 min. In general, mild steels heat treated at 650 ºC using normalized method showed lowest corrosion rates compared to the other cooling methods used. Also, heat treated at 950 ºC using stress relief showed lowest corrosion rate compared to the other cooling methods used.

Keywords

Corrosion Heat treatment Mild steel Organic acid

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Copyright (c) 2017 Feyisayo V. Adams, Toyyibat O. Badmus, Eugene Uwiringiyimana

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