Abstract
The mechanism of inhibition of AA2024-T3 by sodium silicate at varying pH was investigated using electrochemical, microscopic and spectroscopic techniques. Polarization curves in naturally aerated solution showed that silicate provides strong anodic inhibition in high alkaline conditions at a threshold concentration of 0.01M. The largest effect was a 1V increase in the breakdown potential at a silicate concentration of 0.025M. The corrosion inhibition mechanism involves the formation of a protective film over the alloy surface by absorption of aluminosilicate anions from solution, as has recently been suggested by others in the literature. At near-neutral pH, silicate partially blocked attack of the intermetallic particles by a precipitation mechanism that resulted in the formation of silica- and silicate- based derivatives. In acidic solution, activation of the aluminum surface promoted the formation of a mixed silica/aluminosilicate film over the surface that was porous in nature, providing very little corrosion protection.
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.
