Corrosion protection efficiency of the electrochemically synthesized polypyrrole-azo dye composite coating on stainless steel

Yilmaz S. M., Atun G.

PROGRESS IN ORGANIC COATINGS, cilt.169, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 169
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.porgcoat.2022.106942
  • Dergi Adı: PROGRESS IN ORGANIC COATINGS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Polypyrrole, Azo dye, Composite, Corrosion, Electropolymerization, MILD-STEEL, HALIDE-IONS, ACID, INHIBITION, RESISTANCE, ELECTROPOLYMERIZATION, ELECTRODEPOSITION, ELECTROSYNTHESIS, IMPROVEMENT, PHOSPHATE
  • İstanbul Üniversitesi Adresli: Evet

Özet

The polypyrrole-azo dye (Lanaset-Red-2B) composite coatings were electrochemically deposited on stainless steel 430 by means of repetitive cyclic voltammetry. The composite coatings were synthesized by addition of the dye in 10(-6)-10(-3) M range to 0.1 M oxalic acid solution containing 0.1 M pyrrole monomer. All polypyrrole/Lanaset-Red-2B composite coatings are more protective with respect to the pristine polypyrrole in NaCl (3.5%) medium. The best protective coating synthesized in the presence of 10(-5) M dye using optimized potential range, scan-rate and cycle number were characterized by infrared-reflection-absorption-spectroscopy, scanning-electron-microscopy and energy-dispersive-spectroscopy analyses. The electrochemical characterizations were performed by using potentiodynamic polarization and electrochemical-impedance-spectroscopy techniques. The steel coated with the polypyrrole/Lanaset-Red-2B composite is more resistant in 0.1 M H2SO4 solution comparing to NaCl (3.5%) during long-term immersion until 432 h. The corrosion protection efficiency of the coating is higher than that of its initial value at the end of 432 h immersion in both media due to controlled release of the Lanaset-Red-2B deposited as inhibitor in the polypyrrole structure.