Abstract
In this work, cerium 4-hydroxycinnamate (Ce(4OHCin)3) and strontium zinc phosphosilicate (SZP 391) were separately incorporated as leachable anticorrosive pigments in model organic coatings for safeguarding the structural integrity of AA2198-T851 aluminium alloy under neutral salt spray (ASTM B-117) and immersion test conditions. The coated samples were artificially damaged with a scribe to reveal the underlying substrate. After 840 h of salt spray and immersion tests, the unexposed and exposed samples were characterized with scanning electron microscopy (SEM), interferometry, X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS). The SEM and interferometry revealed relatively rough surface morphology and porous networks due to the dissolution and release of large inhibitor clusters from the organic coatings. These networks provide pathways for transport of inhibitive species. The leached inhibitive species formed a precipitate of protective film in the scribed surfaces, whereas the XPS detected and provided information about the oxidation state of the protective species. EIS study has confirmed the inhibitive properties of the adsorbed film by significantly increasing the impedance modulus of the substrate. The protective films revealed a monolayer structure.
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.
