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\begin{document}

\title{Impact of Processing Parameters in Plasma Electrolytic Oxidation (PEM)
on Corrosion Resistance of Magnesium Alloy Type AZ91}



\author[1]{Talal Aljohani}%
\author[1]{Sami  Aljadaan}%
\author[1]{Meteb  Bin Rubayan}%
\author[2]{Fuad  Khoshnaw}%
\affil[1]{KACST}%
\affil[2]{De Montfort University}%


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  \date{June 08, 2024}


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\begin{abstract}
This study aims to investigate the effect of the processing parameters
in plasma electrolytic oxidation (PEO) on the corrosion resistance of
magnesium alloy type AZ91. The PEO coatings were prepared on the samples
using alkaline-based electrolyte. Both unipolar and bipolar, different
frequencies and duty cycles were applied. Corrosion tests, using
potentiodynamic polarisation (PDP), linear and cyclic, and
electrochemical impedance spectroscopy (EIS) techniques, were applied on
the as-received and PEO coated samples. Scanning electron microscopy was
used to investigate the surface morphology, e.g. micropores, as well as
to measure the thickness of the coated layer with changing the
processing parameters. The results show that the size of micropores is
interrelated to the duty cycle percentage and current polarities, as the
higher frequency causes thinner coating layers, with fewer micropores,
consequently higher corrosion resistance. In addition, increasing the
duty cycle, a denser and more compact coating was obtained. The XRD
results showed missing peak of the \selectlanguage{greek}α-\selectlanguage{english}Mg phase in a PEO coated sample
using Bipolar, the highest frequency (1666 Hz) and the highest duty
cycle (66.6\%). The mils per year calculations showed that the PEO
coated have lower corrosion rate by at least 8 times than the
as-received alloy.%
\end{abstract}%



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