Abstract
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.
Highlights
Corrosion occurs in consecutive oxidation reactions when metal is exposed to an erosive species, such as O2 and H+, resulting in the deterioration of metal
All of the above methods of corrosion protection are involved in one of the following ways: (i) in cathodic protection, an electron is donated to the steel from a sacrificial material; (ii) in anodic protection, an electron is withdrawn from the steel; or (iii) the steel surface is sealed off from corrosive attacks by a surface layer of another material
Since Diaminobenzenesulfonic acid (DABSA) has two amino groups (–NH2 ) in the ortho and para position on the benzene ring, DABSA molecules more readily generate diradical dications than AN molecules, which corresponds to peak B (~800 mV)
Summary
Corrosion occurs in consecutive oxidation reactions when metal is exposed to an erosive species, such as O2 and H+ , resulting in the deterioration of metal. Organic and polymeric coatings have been employed to protect metals against corrosion. These coatings are employed to form a barrier between erosive species and metals, preventing metals from contacting these erosive species, reducing oxidation [5]. The mechanism for enhanced corrosion protection has been attributed to an increase in the corrosion potential and the redox catalytic capability of PAN in the formation of a passive metal oxide layer [9,10,11], the precise mechanism of this corrosion control on metals via PAN films has yet to be fully clarified [12]
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