The Use of Expired Drug Anaprilin Against Corrosion of Carbon Steel

Environmentally friendly corrosion inhibitors, also known as «green» inhibitors, have been used for the past decade. In the experiments in the field of corrosion inhibition. Scientific research is actively conducted on the use of expired medicines as «green» corrosion inhibitors of metals and alloys. In this work, the inhibitory effect of the expired pharmaceutical drug Anaprilin against corrosion of carbon steel St3 in 1H sulfuric acid solution was studied. The concentration of the drug varied within 20…80 mg/l. The research was carried out using gravimetry, potentiodynamic polarization, impedance spectroscopy, and electrochemical diffusion techniques. Gravimetric corrosion tests conducted at room temperature and 80 °C showed the protective effectiveness of the drug, reaching 90% at the highest concentration under study. The presence of Anaprilin in the solution causes a slowdown in the anodic partial electrode reaction and a decrease in the capacity of the electrical double layer. The adsorption isotherm of Anaprilin was determined and the change in free energy of adsorption was calculated. Anaprilin reduces the diffusion current of hydrogen through a steel membrane.

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