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The enhancing power of iodide on corrosion prevention of mild steel in the presence of a synthetic-soluble Schiff-base: Electrochemical and surface analyses

Lashgari, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.electacta.2010.05.066
  3. Abstract:
  4. 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
  5. Keywords:
  6. Desorption-adsorption process ; Inhibitors in vacuo ; Mild steel corrosion ; Adsorption process ; Inhibition mechanisms ; Mild steel ; Schiff-base ligands ; Acids ; Adsorption ; Carbon steel ; Corrosion prevention ; Desorption ; Infrared spectroscopy ; Ligands ; Scanning electron microscopy ; Steel corrosion ; Sulfuric acid ; Corrosion inhibitors
  7. Source: Electrochimica Acta ; Volume 55, Issue 20 , August , 2010 , Pages 6058-6063 ; 00134686 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0013468610007681?np=y