PG and Research Department of Chemistry, Rajah Serfoji Government College (Autonomous), Thanjavur-613 005, Tamil Nadu, India (Affiliated to Bharathidasan University, Thiruchirappalli-620 024, Tamil Nadu, India) E-mail: elangoorganic@gmail.com Manuscript received online 29 June 2020, accepted 25 August 2020 The anticorrosive effect of a new triazole derivative 4-(4-methoxy-phenyl)-1-phenethyl-1H-[1,2,3]triazole (MPPT) on mild steel specimens exposed in 1 M HCl corrosive solution was inspected by the mass reduction, polarization and impedance methods. The thermodynamic parameters, corrosion kinetics, and adsorption isotherm studies of the examined MPPT were discussed at various temperatures. The polarization study discovered that MPPT was a mixed kind protector with more acidic existence and the electrochemical measurements were in fine concordance with the mass loss method. SEM, EDS, and AFM assessments corroborated the development of inhibitive barriers on the mild steel specimens.