@article{MAKHILLJEAS2020151619410,
    title = {Double-Layer Coatings for Surface Improvement of Al 6061 Alloys by Anodizing and Micro
Plasma Oxidation Process MPO using New Hydroxy Apatite and Rock Additives Modified
Electrolytes},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {15},
    number = {16},
    pages = {3112-3121},
    year = {2020},
    issn = {1816-949x},
    doi = {jeasci.2020.3112.3121},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2020.3112.3121},
    author = {Samir},
    keywords = {Micro arc oxidation,Aluminium alloy,Rock additive,Hardness,wear resistance},
    abstract = {In this research, duplex ceramic coatings were
deposited on Al 6061 alloy, using anodizing and Micro
Plasma process (MPO). MPO electrolyte was modified
using hydroxy apatite and 15 g L<sup>&#150;1</sup> rock additives rich
with Calcium Carbonate (CaCo<sub>3</sub>). Phase composition of
the coatings, micro structure, micro-hardness, topography,
thickness, roughness and wear resistance were evaluated
by X-Ray Diffraction (XRD), (SEM), a Vickers indenter,
AFM and Microprocessor coating thickness meter,
roughness test and Micro test, respectively. Results
showed that the samples coatings contained &#947;-alumina and
their thickness and hardness increased by the increasing
of deposition time. The research demonstrates that a
relatively hard, thick and uniform coatings with good
wear resistance, can successfully be deposited on Al alloy
using hydroxy apatite and 15 g L<sup>&#150;1</sup> CaCo<sub>3</sub> rock additives
containing electrolytes as an natural rock additives.}
    }