Tolyltriazole (TTA) is a well-defined corrosion inhibitor for copper and copper alloys. However, there is little literature about its corrosion inhibition performance for mild steels in corrosive environments. This paper studied the electrochemical behavior of TTA in 0.5 M HCl solutions. Also, the morphology and nature of TTA layers on the steel surface were investigated. Electrochemical results showed that TTA is an excellent corrosion inhibitor for mild steel in acidic media with an efficiency of 91% for 0.07 M concentration. The results also indicated that TTA is a mixed-type inhibitor. XRD analysis revealed that the inhibition mechanism of TTA is based on the formation of an organic film due to the physically adsorbed molecules of TTA. AFM and EDS results showed that the formed layers decrease the adsorptivity of corrosive elements (Cl-) on the steel surface. Density Functional Theory (DFT) study confirmed the experimental results.

In the present study, a microwave-assisted extraction (MAE) technique has been developed for extraction of phenolic and flavonoid compounds from eucalyptus leaves. Various experimental conditions, such as solvent type, ethanol concentration, MAE time, liquid/solid ratio and pre-leaching time before MAE were examined to optimize the extraction. Among the solvents tested, 50% aqueous ethanol extracted the highest phenolic and flavonoid contents from eucalyptus leaves. The extraction of phenolic and flavonoid compounds with MAE for 5 min was equivalent with ultrasound-assisted extraction (UAE) (60 min) and traditional extraction (24 h) methods. Time of extraction at room temperature and UAE was about 288 and 12 times higher than the needed with MAE, respectively. Due to the considerable saving in time, MAE was more effective than the traditional and UAE methods.