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Corrosion cannot be completely stopped; however, the rate of corrosion can be retarded, hence the need for corrosion inhibitors. Corrosion process can be mitigated by the use of various chemical inhibitors; using green inhibitors is one of the methods used to control corrosion and still preserved the environment. The present study presents the extraction of thevetia peruviana extract using soaking method in Ethanol, and bio inhibitive properties of Thevetia peruviana fruit (TPF) extract on low carbon steel corrosion in sulphide solution. Low carbon steel samples were subjected to six sodium sulphide solution environments; five of the environments have TPF extract ranging from 10 ml to 50 ml while the 6th which served as control has no TPF extract. Weight loss experiment was carried out for 28 days and readings were taken at 4 days interval. Mechanical tests (impact test and tensile test) were also carried out on the low carbon steel samples. The results revealed that TPF extract exhibited inhibitive property at concentrations (10 ml, 20 ml, 30 ml, 40 ml and 50 ml), but the effect was more pronounced at higher concentrations (40 ml and 50 ml). The inhibitor with 50 ml of Thevetia peruviana extract showed the lowest corrosion rate of 0.0028 mm/yr on the 28th day and highest inhibition efficiency of 90% on the 8th day. Hence Thevetia peruviana extract was successfully used as inhibitor of low carbon steel in sulphide environment.
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