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Effects of current frequency on the structural characteristics.pdf

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Effects of current frequency on the structural characteristics

E a m G X a b a A R R 1 A K P M C C 1 M w h a t a i ( h a o r i 0 dj ournal of mater ials process ing technology 2 0 8 ( 2 0 0 8 ) 9–13 journa l homepage: www.e lsev ier .com/ locate / jmatprotec ffects of current frequency on the structural characteristics nd corrosion property of ceramic coatings formed on agnesium alloy by PEO technology uo-Hua Lva,?, Huan Chena, Wei-Chao Gua, Li Lia, Er-Wu Niua, ian-Hui Zhangb, Si-Ze Yanga Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China College of Science, Changchun University of Science and Technology, Changchun 130022, Jilin Province, China r t i c l e i n f o rticle history: eceived 16 August 2007 eceived in revised form 7 December 2007 ccepted 22 December 2007 a b s t r a c t Plasma electrolytic oxidation (PEO) process was carried out on magnesium alloy with a pulsed direct current (dc) power source at high and low frequencies. The morphology and phase composition of the coatings were investigated by scanning electronmicroscopy (SEM) and X-ray diffraction (XRD). The corrosion performances of the different coatings were eval- uated via a three-electrode system in a 3.5-wt.% NaCl solution. It was detected that the PEO coatings weremainly composed of MgF2 andMg3(PO3)2 phase. Coatings produced at relative high frequency had smaller pore size and looked much denser than those at low frequency.eywords: lasma electrolytic oxidation agnesium urrent frequency As a result, they performed better corrosion resistance in the present corrosive solution. These experimental results could be ascribed to the formation mechanism of the PEO coat- ings: lower frequency provided longer time for one single pulse, which induced continuous discharge. than that for aluminum and titanium alloy since coatings pro-orrosion resistance . Introduction agnesium is the third abundant metal element on the earth, hich is just less than aluminum and iron. Magnesium alloys ave low