Premium
Comparison study on anticorrosion performances of the epoxy coatings with two different nano‐polyanilines for Q235 steel
Author(s) -
Hou W. P.,
Liu Y.,
Ge Z. Y.,
Zhao W. Y.
Publication year - 2013
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201206862
Subject(s) - polyaniline , tafel equation , epoxy , corrosion , materials science , aqueous solution , sulfuric acid , nano , coating , polarization (electrochemistry) , chemical engineering , nuclear chemistry , electrochemistry , composite material , metallurgy , chemistry , organic chemistry , polymer , electrode , engineering , polymerization
Abstract Sulfuric acid doped nano‐polyaniline was prepared by direct mixed oxidation in two different systems. A novel approach for preparing polyaniline (PANI) in FeCl 2 /H 2 O 2 system was developed. The PANI possessed an excellent dispensability. Corrosion protection of epoxy coatings containing two kinds of polyaniline (PANI) on Q235 steel was studied by electrochemical impendance spectroscopy (EIS) technique and Tafel polarization test in 3.5 wt% sodium chloride (NaCl) aqueous solution. The results indicated that the epoxy coating containing PANI obtained in FeCl 2 /H 2 O 2 system had the best performance of the corrosion protection among three systems under investigation. The possible protective mechanism of PANI was discussed.