A COMPARATIVE STUDY ON THE CORROSION OF STAINLESS STEEL IN 1M HYDROCHLORIC ACID USING Tamarindus indica (TAMARIND) AND Terminalia catappa (TROPICAL ALMOND) LEAVES EXTRACTS AS INHIBITORS

ABSTRACT

The effectiveness of Terminalia catappa (tropical almond) and Tamarindus indica (tamarind) as corrosion inhibitors for stainless steel in 1M hydrochloric acid at 30°C, 40°C and 50°C was investigated in this research. The gravimetric method of analysis was employed for 20 days at a 4-day interval using 0.9, 1.1 and 1.3g/15mL of Terminalia catappa leaves extracts and 1.4 and

2.3g/15mL of Tamarindus indica leaves extracts. The results showed that the two extracts acted as good inhibitors for stainless steel. The corrosion rate, surface coverage, inhibition efficiency, inhibition mechanism and the effects of temperature were analyzed. The results showed that the highest inhibition efficiency for tamarind was 97.71% at 30°C using 2.4g/15mL, while the lowest was 87.95% with 2.3g/mL at 30°C.The highest efficiency for tropical almond was 97.89% with 1.3g/mL at 50°C and the lowest was 88.7% with 0.9g/mL at 50°C. The isotherms showed that tropical almond acted as a mixed type inhibitor, although predominantly by physisorption. The effects of temperatures also confirmed that tamarind adsorbed by physisorption only.

This research work was conducted on with special reference to the impact inventoryvaluation methods has on financial report statements of manufacturing companies. For a longtime now the Accounting profession has not been able to come up with any particular technique or method to be used uniformly in valuing inventory. This research work examined if the method used was as a result ofthe prevailing economic circumstances. A survey research design was adopted for the study; data collected weregotten from both the primary and secondary sources. An infinite population of over 3000 was used and a finite population of 220. Three hypotheses were tested at 5 percent level of significance. Tables and percentages were employed to answer the questionnaires while the statistical regression coefficient analysis and Z- test were used to test the hypotheses. It was found amongst others that the prevailing economic parameter influences the decision of choice of inventory valuation method used. The Accounting professional bodies should try as much as possible to adopt a particular method of inventory valuation and the weighted average method was recommended as a method that can withstand any economic challenges