本文選題：鎂合金 + 微弧氧化��； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：本文以AZ91D鎂合金為試驗(yàn)基材,鋯鹽體系電解液為基礎(chǔ)溶液進(jìn)行微弧氧化處理,研究了隨著加工過程的進(jìn)行電解液的衰變規(guī)律以及對衰變過程電解液對所加工試樣綜合性能的影響。然后期通過一定的方法嘗試對失效溶液再生,對再生電解液和原電解液的加工性能通過試樣的微觀形貌進(jìn)行對比分析,探討了再生過程的機(jī)理及未來的發(fā)展可能性。通過試驗(yàn)分析了電解液pH值、電導(dǎo)率、溫度變化值對電解液隨使用過程失效的變化規(guī)律,對所加工試樣的耐蝕性、致密度和微觀形貌、相組成隨失效過程所受影響進(jìn)行觀察,分析。實(shí)驗(yàn)發(fā)現(xiàn):失效過程引起電解液的pH值升高,電導(dǎo)率增強(qiáng),溫度變化值降低;試樣耐蝕性先下降后上升,致密度先上升后下降,而膜層微觀腐蝕形貌,相組成幾乎沒有發(fā)生變化。嘗試了已經(jīng)失效的溶液采用過濾、添加改良劑的辦法進(jìn)行再生,結(jié)果表明過濾的方法對老化電解液具有一定作用,但不能有效改善失效電解液;而添加改良劑能夠很好地改善失效的電解液,所加工試樣與原電解液相比還存在一定差距,有待進(jìn)一步深入研究。微弧氧化一旦開始進(jìn)行,電解液中的成分即發(fā)生改變(主要是試樣的基體成分在反應(yīng)過程中以雜質(zhì)形態(tài)進(jìn)入電解液,造成電解液污染),隨著加工過程的進(jìn)行電解液通常也會變得不穩(wěn)定,伴隨的現(xiàn)象首先是溶液內(nèi)部出現(xiàn)渾濁,隨后底部有絮狀沉淀析出,起弧電壓升高、弧點(diǎn)變大,所加工的試樣從表面光潔完整到局部粗糙甚至出現(xiàn)麻點(diǎn),電解液使用的時(shí)間越長(加工工件越多)這種現(xiàn)象越明顯。說明微弧氧化過程改變了電解液的性質(zhì),同時(shí)對所加工試樣性能造成影響,而這個(gè)過程是無法避免的。本試驗(yàn)在一定量電解液中采用固定電參數(shù)研究溶液失效問題,當(dāng)電解液無法起弧或者試樣產(chǎn)生宏觀缺陷來確定電解液的失效。
[Abstract]:In this paper, AZ91D magnesium alloy was used as experimental substrate and zirconium salt electrolyte as base solution for micro-arc oxidation treatment. The decay law of electrolyte with the process of processing and the effect of electrolyte on the comprehensive properties of the processed samples were studied. Then through certain methods to try to regenerate the failure solution, the processing performance of the regenerated electrolyte and the original electrolyte were compared and analyzed through the microscopic morphology of the sample, and the mechanism of regeneration process and the possibility of development in the future were discussed. The effect of pH value, conductivity and temperature on the failure of electrolyte was analyzed. The corrosion resistance, density, microstructure and phase composition of the samples were observed. Analysis It was found that the pH value of electrolyte increased, the electrical conductivity increased, the temperature decreased, the corrosion resistance of the sample first decreased and then increased, the density first increased and then decreased, and the micro-corrosion morphology of the film was obtained. The phase composition has hardly changed. The method of filtration and addition of modifier was used to regenerate the failed solution. The results show that the filtration method has certain effect on the aging electrolyte, but it can not effectively improve the invalid electrolyte. The addition of modifier can improve the failure electrolyte, and there is still a certain gap between the processed sample and the original electrolyte, which needs to be further studied. Once the micro-arc oxidation begins, the composition of the electrolyte changes (mainly the matrix of the sample enters the electrolyte in the form of impurities during the reaction. When the electrolyte is contaminated with the electrolyte, it usually becomes unstable with the process of processing. The accompanying phenomenon is the turbidity in the solution, and then there is flocculent precipitation at the bottom, the arc voltage rises and the arc point becomes larger. The sample processed from smooth and clean surface to local roughness or even the occurrence of points, the longer the electrolyte is used (the more workpieces are processed), the more obvious this phenomenon is. The results show that the process of micro-arc oxidation changes the properties of electrolyte and affects the properties of the samples, which is unavoidable. In this experiment, fixed electrical parameters are used to study the solution failure in a certain amount of electrolyte. When the electrolyte can not start arc or the sample produces macroscopic defects, the failure of the electrolyte is determined.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4

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