Microstructure of AZ91 alloy after (a) HCl pre-treatment, and (b) HCl pre-treatment followed by CeCC. (c, d) SEM images of the conversion coated alloy after five days of immersion in chloride media (c) without acid pre-treatment and, (d) with acid pre-treatment. Nyquist and polarisation plots of differently coated alloys are also provided [145].
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