Mechanism and Corrosion Inhibition of Mild Steel by 1,2,4-Triazole in Acidic Media
摘要
Corrosion of mild steel (MS) in acidic environments is a serious issue in industries, requiring the development of effective corrosion inhibitors. Among various organic compounds, 1,2,4-triazole (TAZ) has garnered attention due to its nitrogen-rich structure and strong adsorption capability on metal surfaces. This study explores the efficiency of corrosion inhibition of TAZ for MS in acidic media, focusing on its adsorption mechanism, electrochemical behavior, and surface interactions. The corrosion protects MS against 0.5 M media of sulphuric acid, which was evaluated using a TAZ through gravimetric techniques. TAZ confirmed better corrosion protection for MS in a solution of 0.5 M H2SO4, revealing effective performance at high concentrations (300 mM), and achieving maximum protection efficiency of 73% at 303 K. The efficiency of inhibition was estimated by electrochemical impedance spectroscopy, weight-loss measurements, and potentiodynamic polarization. Outcomes reveal that the mixed-type of inhibitor is TAZ, also reducing both dissolution of anodic metal and hydrogen evolution at the cathode. TAZ functions as a mixed-type corrosion inhibitor, and its adsorption behavior aligns with the Langmuir adsorption isotherm. The calculated free energy of adsorption suggests that the inhibition process is primarily governed by physical adsorption. The activation energy and parameters of thermodynamics are designed and thoroughly analyzed. The potential of TAZ as a naturally mild and cost-effective inhibitor for protecting MS in acidic conditions, with implications for industrial pickling, oil-well acidizing, and acid cleaning processes applications.