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Action Mechanism of Solute Ions during the Formation and Growth of Microarc Oxidation Coatings on Aluminum Alloy

Author: XianLinYun
Tutor: JiangBaiLing
School: Xi'an University of Technology
Course: Materials Science and Engineering
Keywords: LY12 aluminum alloy Solute ions Micro-arc oxidation Ceramic layer Mechanism of action
CLC: TG174.453
Type: Master's thesis
Year: 2009
Downloads: 62
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Abstract


Explore the mechanism of solute ions in the the ceramic layer formation and growth process of LY12 aluminum alloy micro-arc oxidation process in the different solutes ion electrolyte . In this paper, SEM observation of micro-arc oxidation ceramic layer surface and cross section morphology ; eddy current thickness gauge micro-arc oxidation ceramic layer thickness ; XRD analysis of the phase composition of the surface of the aluminum alloy samples ; using electrochemical test comparison of aluminum alloy impedance change in the resultant coating layer of the solute ions in electrolyte . The results show that : the sample surface in the NaCl and Na2S04 electrolyte corrosion and dissolution occurs , the ceramic layer can not be formed , the sample may be in the sodium silicate electrolyte breakdown occurs in the short period, a low voltage discharge the Al203 the ceramic layer is formed ; can occur from the the arc phenomena sample surface impedance values ??than arcing phenomena impedance value is nearly two orders of magnitude higher ; pre- preparation film of aluminum alloy can significantly shorten the micro-arc oxidation arcing time , reduce arcing voltage , but pre- prepared film thickness on the arcing time and voltage of the size and impedance values ??are very small ; film-forming aluminum alloy surface pre- preparation film re-engage in the latter part of the growth process of the ceramic layer . Solute ions on the micro-arc oxidation initial stage performance of the deposited film to the surface of the aluminum alloy sample to form a barrier layer of easy \late growth stage of the breakdown discharge conditions ; solute ions as a corrosion inhibitor in the late growth stage of the ceramic layer , the hydrolysis of the growth of the ceramic layer to provide reactive oxygen species . The best pre- preparation film alloy by micro -arc oxidation electrolyte conductivity 2.5 × 104μs/cm , pH 9 , this solution can be prepared by a dense surface , no stratification of micro-arc oxidation ceramic 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 > Inorganic complex layer of protection > Ceramic stratified
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