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Surface Modification of ZK60 Mg Alloy by High Current Pulsed Electron Beam and/or MAO

Author: TianXiaoMei
Tutor: TuGanFeng；GaoBo
School: Northeastern University
Course: Non-ferrous metallurgy
Keywords: Magnesium alloy Intense pulsed electron beam Micro-arc oxidation Corrosion Friction and wear
CLC: TG174.4
Type: Master's thesis
Year: 2008
Downloads: 85
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Abstract


Intense pulsed electron beam treatment over the past few years developed an emerging material surface modification technology. A lot of research work has shown that intense pulsed electron beam surface treatment can significantly improve the anti-corrosion and abrasion wear properties of aluminum and die steel surface, so as to further expand the field of application of magnesium alloy, this thesis, intense pulsed electron beam ZK60 magnesium alloy surface modified to improve its resistance to corrosion and abrasion wear performance, study the the modified layer organizational structure and morphology characteristic changes of different parameters on the corrosion resistance and the friction and wear properties; on the other hand to explore magnesium alloy surface treatment of the new method, the paper will be micro-arc oxidation and intense pulsed electron beam used in ZK60 magnesium alloy composite modified surface modification, initially explored the feasibility of two surface modification technology composite processing. , XRD analysis, scanning electron microscopy of the microstructure of the alloy surface before and after modification and resistance to corrosion and abrasion wear properties of the alloy were tested, the results showed that: (1) after intense pulsed electron beam treatment ZK60 magnesium alloy surface generated a layer thickness of approximately 5-11μm of the remelting layer. The remelting layer surface having a small number of cracks and craters; due to the evaporation of the magnesium deposited on the surface at the same time there is a small pure magnesium particles; remelted layer tissue fine grain size, and significantly reduced the degree of segregation of alloying elements, increased degree of solid solution; 3.5% NaCl solution in potentiodynamic polarization curve test results show that the ZK60 magnesium alloy intense pulsed electron beam modified significantly improve corrosion resistance, which 23KV accelerating voltage electron beam 15 times ZK60 magnesium alloy corrosion current density decreased from 311μA/cm2 to 42.2μA/cm2, decreased by 86%, the corrosion potential increased from-1312mV to-1220mV, increased by 92 mV; On the other hand, the friction and wear Experimental results show that the modified alloy lower coefficient of friction, abrasion performance has been improved accelerating voltage of 27KV, bombarded 15 times the sample coefficient of friction and wear both better than the other samples, the amount of wear decreased by 80%; (2) Microstructure of ZK60 magnesium alloy by micro-arc oxidation treatment surface of the layer thickness of approximately 18μm layer of ceramic, ceramic layer of loose layer and dense layer and loose layer distribution holes, representing approximately 90% of the entire film thickness; intense pulsed electron beam treatment ZK60 magnesium alloy surface by micro-arc oxidation bump ups and downs uneven, modified layer thickness of approximately 3-4μm, the the modified layer than micro-arc oxidation ceramic layer dense; intense pulsed electron beam generated the same uneven thickness of the layer of ceramic ZK60 magnesium alloy surface by micro-arc oxidation treatment modified layer modified layer, the dense layer is not continuous; intense pulsed electron beam and then micro-arc oxidation treatment surface modification layer growth model. 3.5% NaCl solution, potentiodynamic polarization curve test and the friction and wear experimental results show that the dynamic: corrosion resistance, abrasion performance improved after a sample of the composite surface modification treatment, and intense pulsed electron beam processing via micro arc oxidation treatment the specimen corrosion resistance can be significantly improved corrosion current density decreased from 311μA/cm2 to 0.2μA/cm2, reduced by three orders of magnitude; via micro-arc oxidation via intense pulsed electron beam treatment sample amount of wear a 80% reduction. The composite surface processing experiments verify the rapid melting of intense pulsed electron beam sparse hole formed by micro-arc oxidation sealing specific optimization of experimental parameters set there to be explored further improvement.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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