|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Surface Engineering IV
||Electrochemical Corrosion Tests of Aluminum 1100 Alloy Coupons in Acid Condensate Environment
||Vasundhara Shinde, Gaurav Argade, Anusha Chilukuri, Monica Gehrich, Chirag Parikh
|On-Site Speaker (Planned)
In this study, product validation tests were compared with rapid electrochemical tests in diesel exhaust condensate environments. Al1100 alloy coupons were exposed to elevated temperature cycles in an acid condensate environment (simulating diesel exhaust conditions) for 36 days, followed by room temperature electrochemical tests. Day 10 coupons showed the lowest corrosion rates which are attributed to formation of protective aluminum hydroxide layer. In the potentiodynamic test, day 10 coupons showed least anodic current densities at +200 mV vs Ag/AgCl and nobler corrosion potentials as compared to day 36 coupons. A similar trend of lower frequency impedance was observed in electrochemical impedance spectroscopy (EIS) scans between 10-2 to 105 Hz. In the post-corrosion examination, pitting on coupons was confirmed along with higher wt.% oxygen measured through Energy-dispersive X-ray spectroscopy, and the corrosion rate increase after 10 days is attributed to eventual degradation of the aluminum hydroxide layer.
||Environmental Effects, Aluminum, Other