Scientia Iranica

Scientia Iranica

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

Document Type : Research Article

Authors
N. Pirhady Tavandashti 1
M. Ghorbani 1
A. Shojaei 1
J.M.C. Mol 2
H. Terryn 3
Y. Gonzalez-Garcia 2
1 Institute for Nanoscience and Nanotechnology (INST), Sharif University of Technology, P.O. Box 11155-8639, Tehran,Iran.
2 Department of Materials Science and Engineering, Delft University of Technology, 2628CD, Delft, The Netherlands.
3 Department of Materials Science and Engineering, Delft University of Technology, 2628CD, Delft, The Netherlands
10.24200/sci.2017.4426
Abstract
Nanostructured hollow polyaniline (PANI) capsules are good candidates for encapsulation of corrosion inhibitors and pH-responsive release when incorporated into organic coatings. In previous work the corrosion protection performance of PANI capsules containing organic inhibitor 2-Mercaptobenzothiazole (MBT) was demonstrated. The present work studies the influence of capsule concentrations (i.e. 0.3, 1 and 2 wt.%) on the corrosion protection properties of the coating system. Anti-corrosion properties of different coatings were compared by means of Electrochemical Impedance Spectroscopy (EIS), and Scanning Vibrating Electrode Technique (SVET). MBT loaded PANI capsules in epoxy ester coating on AA2024-T3 substrate allows for a self-healing effect to be obtained during the corrosion process. The results showed that the concentration of MBT loaded PANI capsules greatly influence the corrosion protection properties of the coatings, and the best corrosion protection performance was observed for the coating system containing 1 wt% PANI capsules. The impedance value of the scratched area of this coating after 7 days of immersion was one order of magnitude higher than that of the control sample.
Keywords
Nanostructured Polyaniline Capsules
MBT corrosion inhibitor
organic coating
Corrosion Protection
Subjects
Scientia Iranica
Volume 24, Issue 6 - Serial Number 6
Transactions on Nanotechnology (F)
November and December 2017
Pages 3512-3520

  • Receive Date 08 August 2016
  • Revise Date 18 January 2017
  • Accept Date 22 April 2017