Copper Corrosion in Blended Diesel‐Biodiesel: Corrosion Rate Evaluation and Characterization

Abstract

Abstract The need for affordable and clean energy calls for biodiesel production from renewable sources. Thus, corrosion rate (CR) examination of diesel engine components in biodiesel is vital. This study examined the corrosion behavior of copper coupon (CC) in diesel fuel blended with biodiesel synthesized from waste cooking oil. Characterization and CR evaluation were executed at immersion time, temperature, blending ratio, and agitation of 30–60 days, 30–50 °C, 10–30 (v/v) %, and 110–130 rpm, respectively. Physicochemical properties of blended biodiesel changed after CC corrosion. Minimum CR of 0.002537 mm y −1 was recorded at 30 days, 30 °C, 20 (v/v) %, and 110 rpm, respectively. The developed Taguchi model was excellent. R 2 , RMSE, MAE, SEP, and AAD were 0.9992, 0.0004156, 0.0003022, 0.01695, and 0.6855, respectively. Pits formation, the presence of Cu, C, and O on CC surface, and 10.83 ppm Cu ions in blended sample were noticed at highest CR.