TY  - JOUR
T1  - 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
AU - Hamid Awad, Samir 
JO  - Journal of Engineering and Applied Sciences
VL  - 15
IS  - 16
SP  - 3112
EP  - 3121
PY  - 2020
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2020.3112.3121
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2020.3112.3121
KW  - Micro arc oxidation
KW  -Aluminium alloy
KW  -Rock additive
KW  -Hardness
KW  -wear resistance
AB  - 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.
ER  -