Abstract
In this work, sulfuric acid (H2SO4), hydrochloric acid (HCl), citric acid (CA), sulfosalicylic acid (SSA) and p-toluenesulfonic acid (PTSA) doped polyaniline and the corresponding PANI waterborne epoxy composite (PANI/WEP) coatings were successfully prepared to clarify the effects of the doped acid on passivation and anticorrosion performance of the coatings for 5083 Al alloy. The protection performance of the PANI/WEP coatings and its induced product film on Al alloy, as well as the redox ability of the doped PANI were comprehensively illustrated. Results demonstrated that the doping acid has a noticeable influence on the anticorrosion and passivation performance of the PANI/WEP coatings. PANI-SSA/WEP coatings and the induced product film exhibited the highest impedance value at low frequency compared with other coatings. The significantly enhanced protective performance of the PANI-SSA/WEP coatings is mainly attributed to the prominent oxidation-reduction reversibility of PANI-SSA which ensures sufficient passivation of the underlying Al substrate, in addition to the inhibition functionality of the released sulfosalicylic acid, which formed complexes with the substrate and facilitated the anticorrosion performance of the composite coatings.
Sign-in/Register to access full text options 
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.
