Effect of current density on the microstructure and corrosion resistance of microarc oxidized ZK60 magnesium alloy.

Abstract:

:The application of magnesium alloys as biomaterials is limited by their poor corrosion behavior. Microarc oxidation (MAO) treatment was used to prepare ceramic coatings on ZK60 magnesium alloys in order to overcome the poor corrosion resistance. The process was conducted at different current densities (3.5 and 9.0 A/dm(2)), and the effect of current density on the process was studied. The microstructure, elemental distribution, and phase composition of the MAO coatings were characterized by scanning electron microscopy, energy-dispersive x-ray spectrometry, and x-ray diffraction, respectively. The increment of current density contributes to the increase of thickness. A new phase Mg2SiO4 was detected as the current density increased to 9.0 A/dm(2). A homogeneous distribution of micropores could be observed in the coating produced at 3.5 A/dm(2), while the surface morphology of the coating formed at 9.0 A/dm(2) was more rough and apparent microcracks could be observed. The coating obtained at 3.5 A/dm(2) possessed a better anticorrosion behavior.

journal_name

Biointerphases

journal_title

Biointerphases

authors

You Q,Yu H,Wang H,Pan Y,Chen C

doi

10.1116/1.4889734

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

031009

issue

3

eissn

1934-8630

issn

1559-4106

journal_volume

9

pub_type

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