Factorial Design on the Corrosion Inhibition Effects of Rubber Seed Oil on Mildsteel

Factorial Design on the Corrosion Inhibition Effects of Rubber Seed Oil on Mildsteel was conducted in this study. The inhibitor concentration, reaction time and temperature were considered, to assess their individual and combined effects on the corrosion inhibition efficiency using standard (statistical) means. The Chochrain’s distribution, G for the study sample was computed to be 0.2594, while the observed one, GTable is 0.6798 at 0.05 level of significance. Also, the Fcalculated was found to be 292.6066, while the Ftable is 4.46. By these values of ‘G’ and ‘F’ (calculated and observed), it was, respectively, deduced that the hypothesis for the homogeneity of variance is acceptable and the model is adequate. The ratified model equation for the study was found to be interactive, which is predominant between X1 (Inhibitor Concentration) and X3 (Time), as well as between X2 (Temperature) and X3 (Time). This indicates that the reaction time is the most significant factor (amongst the factors considered) that affected the corrosion inhibition efficiency; this was further demonstrated by the sequential increase in the response variable (weight loss, yu) with tim

Surface Response Methodology for Mildsteel Corrosion Inhibition by Ethyl Esters of Castor and Rubber Seed Oils

Surface Response Methodology was conducted for Mildsteel Corrosion Inhibition by Ethyl esters of Castor and Rubber Seed Oils. Inhibitor concentration-in-acid medium, temperature and time were considered as the independent variables, in order to know the effect of the response (dependent) variable, which is the weight loss. The design matrix was constructed on the basis of different conditions of the independent variables at varying coded levels of design consideration (-α, -1, 0, +1 and +α), upon which corrosion inhibition experiments were conducted. Contour plots were used to show the combined effects of the factors (concentration, temperature and time) on the inhibition rate of the two study samples: Castor Seed Oil (CSO) and Rubber Seed Oil, RSO. Weight loss for CSO at combined effects of temperature-concentration, time-concentration and time-temperature were found to be 33.01g, 41.11g and 43.30g respectively, while those of RSO are 30.99g 38.16g and 40.15g respectively. This indicates that the time of the corrosion reaction is the most significant factor among the three factors considered in this study, while reaction temperature is more significant, and the inhibitor concentration is least significant. This high significance of reaction time was eventually manifested at the point of optimization, which indicated the highest response value of 44.52g and 43.89g for CSO and RSO respectively. The results, therefore, identifies RSO (with least weight loss, Z=30.99g) as possessing a better inhibition efficiency, when compared to CSO, and the model equations for both samples are of second order (Pure Quadratic)