Anti-Corrosion Characteristics of Electrodeposited Self-Doped Polyaniline Films on Mild Steel in Low Acidity

Without the addition of inorganic acids, 2,5-Diaminobenzenesulfonic acid (DABSA) molecules form an acid environment, and are then electrochemically copolymerized with AN monomers to generate a self-doped polyaniline (SPAN) film on mild steel substrates. These SPAN deposition films are employed to te...

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Published inCoatings (Basel) Vol. 8; no. 5; p. 155
Main Authors Wu, Jhen-Wei, Wang, Tzong-Liu, Lin, Wen-Churng, Lin, Hung-Yin, Lee, Mei-Hwa, Yang, Chien-Hsin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2018
Subjects
Charge transfer
Copolymerization
Corrosion
Corrosion currents
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
Electrochemical impedance spectroscopy
Inorganic acids
Low carbon steels
Maintenance management
Molecular chains
Polyanilines
Protective coatings
Sodium chloride
Substrates
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Summary:Without the addition of inorganic acids, 2,5-Diaminobenzenesulfonic acid (DABSA) molecules form an acid environment, and are then electrochemically copolymerized with AN monomers to generate a self-doped polyaniline (SPAN) film on mild steel substrates. These SPAN deposition films are employed to test the protection efficiency for mild steel in a corrosion environment of HCl and NaCl, respectively. Electrochemical impedance spectroscopy (EIS) and polarization were used to determine the charge transfer resistance (Rct) and corrosion current (Icorr), respectively. The above two parameters Rct and Icorr are combined to evaluate the protection efficiency of SPAN film on mild steel. Experimental results show that the SPAN thin film with the AN/DABSA ratio of 8.8 has the optimal corrosion resistance in 1 M HCl and 1 M NaCl aqueous solutions, respectively.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings8050155