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Study of Growth Mechanism and Technology on Micro-Arc Oxidation of Mg Alloy

Author: XuTaoTao
Tutor: ShenDeJiu
School: Yanshan University
Course: Materials Science
Keywords: Micro-arc oxidation Rare earth salts Potassium fluorozirconate Ultrasonic wave Corrosion resistance
CLC: TG174.4
Type: Master's thesis
Year: 2011
Downloads: 124
Quote: 0
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Abstract


In this paper, AZ31 magnesium alloy as the matrix material , the use of homemade the WH-1A - type micro-arc oxidation equipment for surface treatment, arcing process and sample around the electrolyte changes observed in the darkroom , to study the micro-arc oxidation process , ultrasonic micro-arc oxidation ceramic layer ; targeted to improve the corrosion resistance of magnesium alloy micro-arc oxidation ceramic layer to improve the composition of the electrolyte . Conductivity meter and pH meter change in the nature of the micro-arc oxidation electrolyte research, better contrast processing differences in the nature of the electrolyte , draw the most stable electrolyte ratio ; take advantage of the technical means of SEM, EDS, XRD changes in the morphology of the film , the material composition phase ingredients change the effect of the additives on the film ; immersion test , electrochemical corrosion resistance test on the morphology and composition of the ceramic layer a comparative study of to draw magnesium alloy micro- arc oxidation treatment process parameters of the best corrosion resistance , has a guiding role to further improve the performance of magnesium alloy micro-arc oxidation film direction . The research results show that the magnesium alloy micro- arc oxidation film forming process with obvious matrix corrosion , the electrolytic corrosion products of matrix sintering of micro- arc oxidation film-forming raw material , the corrosion of the electrolyte matrix too fast or voltage is too low can not breakdown produce micro-arc sintering metal surface corrosion can not film-forming ; occurrence of a change in the role of ultrasound , the morphology of the micro-arc oxidation , increases the degree of film compact , different matrix material findings law ; electrolytic different types of rare earth salt is added in the liquid electrolyte nature of change is not the same micro-arc oxidation process is not the same amount of salt is added the right amount of rare earth can stabilize the micro-arc oxidation process , reduce arcing voltage increase the growth rate of the film layer ; potassium fluorozirconate addition of Zr element introduced , not only to the layer of wear-resistant , while the introduction of the F element to improve the surface roughness of the coating layer and the degree of white light , and SEM results show that the surface of the film morphology changes , the diameter of the pores decreases , the densification increases , the electrochemical test proved potassium fluorozirconate adding significantly increases the corrosion resistance of the coating layer .

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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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