Volume 15, Issue 4 (2-2026)
مهندسی خوردگی 2026, 15(4): 22-22 |
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Evaluation of the Inhibitive Performance of Expired Bismuth Subcitrate and Nortriptyline Drugs as Corrosion Inhibitors for Carbon Steel in Sodium Chloride Solution. مهندسی خوردگی 2026; 15 (4) :22-22
URL: http://journal.ica.ir/article-1-265-en.html
URL: http://journal.ica.ir/article-1-265-en.html
Abstract: (5 Views)
Despite the widespread use of corrosion inhibitors, the high cost and toxicity of some inhibitors, such as sodium chromate, hydrazine, and zinc arsenate, have limited their application. Many pharmaceutical compounds are non-toxic and biocompatible in nature. Therefore, in this study, two types of expired drugs, bismuth subcitrate and nortriptyline, were used as corrosion inhibitors for carbon steel in a 3.5 wt.% sodium chloride environment. Potentiodynamic polarization and electrochemical impedance spectroscopy were employed to investigate the corrosion behavior of the samples. The effect of 48 hours of immersion on the morphology of the corroded surface was examined. In addition, the effect of long-term exposure of the samples (216 hours) in inhibitor-containing environments on weight change was evaluated. Based on the electrochemical test results, the maximum inhibition efficiency for bismuth subcitrate was 72% at a concentration of 30 ppm, while for nortriptyline it was 79% at a concentration of 200 ppm. Both inhibitors, at their optimal concentrations, approximately doubled the polarization resistance of carbon steel in the sodium chloride environment. In the long-term immersion test, nortriptyline exhibited significantly better performance, with an inhibition efficiency of 83%, compared to 50% for bismuth subcitrate. Therefore, it can be concluded that nortriptyline is a more suitable option than bismuth subcitrate for long-term corrosion inhibition.
Keywords: Inhibitor, Expired drug, Bismuth Subcitrate, Nortriptyline, Polarization, Electrochemical impedance
Type of Study: Research |
Subject:
General
Received: 2026/09/30 | Accepted: 2026/02/3 | Published: 2026/02/3
Received: 2026/09/30 | Accepted: 2026/02/3 | Published: 2026/02/3
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