AN INVESTIGATION OF THE EFFECT OF HEAT TREATMENTS ON CORROSION PROPERTIES OF PLAIN CARBON STEEL IN CORROSION MEDIUM
Publication Date : 30/12/2020
The effect of heat treatment on corrosion of plain carbon steel in tap water, salt water, soil and 0.5MHCl medium were investigated by means of weight loss method. The specimens were machined into 20 pieces. Out of these, 4pieces were annealed,4- tempered, 4-normalized, 4-hardened and the remaining 4 were control (untreated) specimens. Each of these specimens were put in each medium and were regularly examined after every 48hours for a duration of 240hours. The results show that annealed specimen has zero tolerance to corrosion in salt water and soil medium for the period of studies. Annealed specimen has a very low corrosion rate in tap water medium (0.005mpy) as compared with tempering and hardening with the highest rate of 0.012mpy. However, there were high rate of weight loss in acidic medium. This may not be attributed to corrosion only as the metal is expected to react with HCl and hence liberate gas. The control specimen shows the lowest rate of corrosion in this medium followed by annealed specimen. However, the results clearly show that annealing is a promising method of liberating plain carbon steel from the destructive effect of corrosion.
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