International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 2, February 2017

International Journal of Science and Technology


Investigation of the Effects of Heat Treatment on the Corrosion Behaviour of Welded Low Carbon Steel in Different Environments

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Author(s) Ayodele C.O, Nenuwa O.B.
On Pages 333-340
Volume No. 3
Issue No. 8
Issue Date August, 2013
Publishing Date August, 2013
Keywords Corrosion, Low-carbon steel, Welding, Normalizing, Annealing, Quenching


Abstract


The effects of heat treatment on the corrosion behaviour of welded low carbon steel in distilled water, hydrochloric acid and sodium chloride solution at ambient temperature (250C) was studied. Twenty 10x10x10mm low carbon steel samples were divided into four groups (A, B, C and D) with five samples in each group. Group A samples were not welded while group B, C and D were welded using electric arc welding techniques and then subjected to stress relieving annealing. Samples in group B, C and D were thereafter heat–treated by normalizing, annealing and quenching respectively. Samples in the four groups were dipped in 0.3M and 0.5M HCl, 0.3M and 0.5M NaCl and distilled water for 21days and the potential difference and weight loss were measured after every 3 days. The corrosion rate was calculated using the ASTM recommended relation. The result revealed that in distilled water and 0.3M NaCl, the annealed samples had better corrosion resistance than the normalized and quenched samples, but in 0.5M NaCl, the quenched sample had better corrosion resistance than the annealed and normalized samples. The normalized samples were found to have lower corrosion rate in both 0.3M and 0.5M HCl when compared with the annealed and quenched samples.

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