The enhancing power of iodide on corrosion prevention of mild steel in the presence of a synthetic-soluble Schiff-base: Electrochemical and surface analyses
✍ Scribed by Mohsen Lashgari; Mohammad-Reza Arshadi; Somaieh Miandari
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 945 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The inhibitory action of N,N -1,3-propylen-bis(3-methoxysalicylidenimine) {PMSI} on mild steel corrosion in sulfuric acid medium was investigated through electrochemical methods and evaluations based on infrared spectroscopy and scanning electron micrographs. The studies revealed that the molecule is a good mixed-type inhibitor (mostly anodic), acts as a multi-dentate ligand and repels the corrosive agents by hydrophobic forces. Its adsorption on metal surface has a physicochemical nature and obeys the Langmuir isotherm. At a critical (optimum) concentration, an anomalous inhibitory behavior was observed and interpreted at microscopic level by means of desorption/adsorption process and horizontal ↔ vertical hypothesis. The addition of iodide into acid moreover causes a synergistic influence, a substantial enhancement on inhibitory performance. Finally, using isolated inhibitor calculations at B3LYP/6-31G + (d,p) level of theory, the equilibrium geometry of PMSI was determined and the energy required for hindrance avoidance was predicted.