Abstract
Corrosion of high-purity Mg–Al alloys containing 3, 6 and 9wt.% Al was investigated using electrochemical noise (EN) analysis. Changes in the EN signals were correlated with macroscopically observable events on the sample surfaces, which were recorded using time-lapse photography. Steady-state corrosion in all alloys was highly localised. For the Mg3%Al alloy, localised corrosion was preceeded by a period of general corrosion. The corrosion rate of the as-cast Mg9%Al alloy was less than those of the other materials but increased with solution annealing time. The results are consistent with strong galvanic coupling between Al-depleted and -enriched zones of the α-phase.
Sign-in/Register to access full text options 
Free) 
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 call
