Inhibition of iron corrosion by 5,10,15,20-tetraphenylporphyrin and 5,10,15,20-tetra-(4-chlorophenyl)porphyrin adlayers in 0.5 M H2SO4 solutions

Yuanyuan Feng, Shenhao Chen*, Wenjuan Guo, Yuexing Zhang, Guangzeng Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

5,10,15,20-tetraphenylporphyrin (TPP) and 5,10,15,20-tetra-(4-chlorophenyl)porphyrin (TClPP) were synthesized and formed adlayers on iron surface. The surface properties of the porphyrin adlayers on iron electrode were characterized by Fourier transform infrared reflection spectroscopy (FT-IR), fluorescence spectrum (FS), scanning electron microscopy (SEM) and electrochemical methods including electrochemical impedance spectroscopy (EIS) and polarization curves. FT-IR and FS results indicated that TPP and TClPP were able to form adlayers on the iron surface. The electrochemistry results showed that both adlayers of TPP and TClPP were able to protect iron from corrosion effectively and the protection efficiency of TPP was higher than that of TClPP. The surface state of iron was characterized by SEM after the iron electrode was corroded in H2SO4 solutions (0.5 M). Besides, quantum chemical calculation was applied to optimize the structure of the two molecules and was able to explain the experimental results to some extent. Results indicated that TPP and TClPP were good inhibitors for iron corrosion in H2SO4 solutions.

Original languageEnglish (US)
Pages (from-to)115-122
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume602
Issue number1
DOIs
StatePublished - Apr 1 2007

Keywords

  • Adlayers
  • Corrosion inhibitor
  • EIS
  • Iron
  • Tetraphenylporphyrin

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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