EFFECT OF TRISODUM PHOSPHAT CONCENTRATION ON THE MORPHOLOGY AND CORROSION RESISTANCE OF MAGNESIUM ALLOY AZ31B USING PLASMA ELECTROLYTIC OXIDATION (PEO)

Amilatin Rohmah, Agung Purniawan, Diah Susanti

Abstract


Magnesium is one of the candidate materials for biodegradable implants. Magnesium has the same mechanical properties as human bone, but the degradation rate of magnesium fast.  Surface engineering technology is required to decrease the degradation rate on magnesium substrate. This research, using the surface engineering technology of Plasma Electrolytic Oxidation (PEO). the electrolyte solution of PEO used was KOH and Na3PO4.12H2O. The KOH concentration is 1g/l and  Na3PO4.12H2O concentration was varied 0.5, 1, and 2.26 g/l. From the XRD analysis, was found  MgO and Mg3(PO4)2 and there are pores on the surface. When the Na3PO4.12H2O concentration is increased until 2.26 g/l the pores are homogenous, dense, and large. From the potentiodynamic polarization test results that PEO coating can decrease the corrosion rate of magnesium AZ31B from 50.219 mmpy to 0.1368 mmpy.

Keywords


Magnesium AZ31B; Trisodium phosphate; Plasma Electrolytic Oxidation (PEO)

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References


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DOI: http://dx.doi.org/10.12962/j2746279X.v2i1.8770

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