Abstract
Poly (aniline-co-o-anisidine) of copolymer coating was synthesized on copper surface (Cu) in an aqueous solution containing 90 ml of 0.20 M NaOX + 10 ml of 0.20 M oxalic acid. The copper substrate in NaOX solution containing oxalic acid had a fairly reliable passive surface mainly due to the formation of copper (II) oxalate layer. The addition of oxalic acid to working electrolyte contributed to both the amount of copolymer deposition (growth) and that of copolymer coated per unit time of electropolymerization (growth rate). The corrosion performances of copolymer coatings were investigated in 3.5 % NaCl solution with anodic polarization curves and electrochemical impedance spectroscopy. The results showed that oxalic acid led to the diminishing of the permeability of copolymer film. The copolymer coating exhibited an effective barrier property on copper electrode and provided a remarkable anodic protection to substrate for longer exposure time.
Highlights
Copper is one of the most important commodity metal from technological point of view; it must be protected against corrosion under normal environmental conditions (Goncalves et al, 2002)
The corrosion performance of copolymer film synthesized on copper substrate was investigated in 3.5 % NaCl and compared with the AC impedance diagrams and anodic polarization curves
The open circuit potential values (Eocp) of bare copper surface (Cu) and Cu/PANI-co-POA electrodes were monitored with time and plotted against immersion time in hours (Figure 2)
Summary
Copper is one of the most important commodity metal from technological point of view; it must be protected against corrosion under normal environmental conditions (Goncalves et al, 2002). The protection of copper substrate against corrosion has been investigated by many researchers using various methods including inhibitors, organic coatings and metallic (Guenbour et al, 2000; Ozyilmaz, 2006; Kilinççeker et al, 2008; Kilinççeker et al, 2013). Conducting polymers have been an interesting subject of research. The aim of the present study was to synthesize electrochemically PANI-co-POA films on Cu in a novel medium including sodium oxalate (NaOX) and oxalic acid (OX). The synthesis of PANIco-POA film was achieved by using a NaOX medium including OX as an organic acid the amount of which would only be enough to enable the passivation of the electrode surface. The corrosion performance of copolymer film synthesized on copper substrate was investigated in 3.5 % NaCl and compared with the AC impedance diagrams and anodic polarization curves
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
