Abstract
In this study, product validation tests were compared with rapid electrochemical tests in diesel exhaust condensate environments. Al 1100 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 versus 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 and 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.KeywordsAluminum corrosionElectrochemical impedance spectroscopyPotentiodynamic polarizationAcid condensateDiesel exhaust environment
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