本文選題：鎂合金 + 微弧氧化�。� 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：本文在雙極性脈沖電源模式下以AZ91D鎂合金基體為研究對象,利用正交試驗方案設(shè)計,研究了K2ZrF6、EDTA-Na、電壓及它們之間的交互作用對鎂合金試樣在磷酸鹽電解液體系下所制備的微弧氧化陶瓷膜層性能和結(jié)構(gòu)的影響規(guī)律。通過TT260型測厚儀、點滴實驗和電化學(xué)實驗分別表征膜層的厚度、點滴實驗?zāi)臀g性和電化學(xué)測試耐蝕性,并利用SEM觀察了膜層的表面以及截面形貌。研究結(jié)果表明,對于膜厚來說,電壓的影響最大且非常顯著,K2ZrF6和電壓的交互作用的影響次之且顯著,K2ZrF6、EDTA-Na及其交互作用和EDTA-Na與電壓之間的交互作用的影響均不顯著。對于點滴實驗?zāi)臀g性來說,電壓影響最大,比K2ZrF6和EDTA-Na及各因素之間的交互作用的影響高出兩個數(shù)量級,其中除了電壓以外的因素都在一個數(shù)量級上,且電壓、K2ZrF6和EDTA-Na及其之間的交互作用對點滴實驗?zāi)臀g性的影響都不顯著。對電化學(xué)測試耐蝕性來講,K2ZrF6、EDTA-Na及其之間交互作用的影響非常顯著,電壓的影響顯著,EDTA-Na、K2ZrF6與電壓的交互作用影響不顯著,其中影響最大的因素為K2ZrF6,EDTA-Na次之,再是K2ZrF6和EDTA-Na的交互作用。隨K2ZrF6濃度的變化,膜層厚度和點滴實驗?zāi)臀g性變化不大,但在高濃度的K2ZrF6時促使熔融物填充于放電微孔中,減小孔洞等缺陷,使得氯離子不易在膜層中遷移,進而使得電化學(xué)測試耐蝕性增加。EDTA-Na抑制了微弧氧化過程中的劇烈反應(yīng),且濃度越高抑制效果越明顯,越有利于降低了微裂紋等缺陷的產(chǎn)生,進而增加了膜層的耐蝕性。隨電壓的升高,盡管膜層的微孔孔徑略有增大,微裂紋數(shù)量略有增多,但顯著增加了膜層的厚度,使點滴實驗?zāi)臀g性得到提高,也使得膜層電化學(xué)測試耐蝕性有所升高。K2ZrF6和電壓的交互作用,雖然顯著的增加了膜層的厚度,但也可能顯著的增加了膜層微孔和微裂紋等缺陷出現(xiàn)的幾率,使得對膜層的性能影響不顯著。另外,K2ZrF6和EDTA-Na的交互作用,在抑制大弧放電產(chǎn)生的同時,又在一定程度上填充了微弧放電產(chǎn)生的微孔,明顯降低了膜層表面孔隙率和缺陷,提高了膜層的電化學(xué)耐腐蝕性能,使得對電化學(xué)測試耐蝕性影響顯著。
[Abstract]:In this paper, the AZ91D magnesium alloy matrix is used as the research object in the bipolar pulse power supply mode, and the orthogonal test scheme is used to design it. The effect of K _ 2ZrF _ 6 EDTA-Na, voltage and their interaction on the properties and structure of micro-arc oxidation ceramic coatings prepared by magnesium alloy samples in phosphate electrolyte system was studied. The thickness, corrosion resistance and corrosion resistance of the film were characterized by TT260 thickness meter, drip test and electrochemical experiment, respectively. The surface and cross-section morphology of the film were observed by SEM. The results show that for film thickness, the effect of voltage on the interaction between K _ 2ZrF _ 6 and voltage is the most significant, and the interaction between K _ 2ZrF _ 6 and voltage is not significant. The effect of voltage on corrosion resistance is two orders of magnitude higher than that of K2ZrF6, EDTA-Na and the interaction of various factors, except the voltage, all of which are in one order of magnitude. The effect of voltage K _ 2ZrF _ 6, EDTA-Na and their interaction on the corrosion resistance of droplet test was not significant. The effect of voltage on the corrosion resistance of K _ 2ZrF _ 6 / EDTA-Na and its interaction is very significant. The effect of voltage on the interaction between K _ 2ZrF _ 6 and voltage is not significant. The most important factor is K _ 2ZrF _ 6 EDTA-Na, and then the interaction between K2ZrF6 and EDTA-Na. With the change of K2ZrF6 concentration, the thickness of the film and the corrosion resistance of droplet experiments change little. However, when the concentration of K2ZrF6 is high, the melt is filled in the discharge micropore, and the defects such as pores are reduced, so that the chloride ions are not easy to migrate in the film. Thus, the corrosion resistance of electrochemical test increased. EDTA-Na inhibited the severe reaction in the process of micro-arc oxidation. The higher the concentration, the more obvious the inhibition effect was, the more favorable to reduce the production of microcracks and other defects, and then increased the corrosion resistance of the film. With the increase of voltage, although the pore diameter of the film increases slightly and the number of microcracks increases slightly, the thickness of the film increases significantly and the corrosion resistance of the film is improved. It also increased the corrosion resistance of the film. K2ZrF6 and the interaction of voltage, although significantly increased the thickness of the film, but also significantly increased the possibility of defects such as micropores and microcracks in the film. The effect on the performance of the film is not significant. In addition, the interaction of K _ 2ZrF _ 6 and EDTA-Na not only inhibits the generation of large arc discharge, but also fills the micropore produced by micro-arc discharge to some extent, which obviously reduces the surface porosity and defects of the film, and improves the electrochemical corrosion resistance of the film. The results show that the corrosion resistance of electrochemical test is significantly affected.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.45

【參考文獻】

相關(guān)期刊論文 前10條

1 杜勇;林修洲;崔學(xué)軍;楊瑞嵩;劉春海;;鎂合金微弧氧化電解液及其添加劑的研究進展[J];材料保護;2013年10期

2 王淑艷;夏永平;;用優(yōu)化的雙電解液制備AZ91D鎂合金微弧氧化膜(英文)[J];Transactions of Nonferrous Metals Society of China;2013年02期

3 張亞軍;姚忠平;夏琦興;齊素芳;姜兆華;;鎂合金微弧氧化/空氣噴涂復(fù)合膜層的耐鹽霧腐蝕性能[J];材料保護;2011年06期

4 慕偉意;李爭顯;杜繼紅;奚正平;;鎂合金的應(yīng)用及其表面處理研究進展[J];表面技術(shù);2011年02期

5 宋雨來;王文琴;劉耀輝;;鎂合金微弧氧化電解液體系及其添加劑的研究現(xiàn)狀與展望[J];材料保護;2010年11期

6 姜偉;王桂香;;鎂合金微弧氧化工藝的研究進展[J];電鍍與環(huán)保;2010年04期

7 潘明強;遲關(guān)心;韋東波;狄士春;;我國鋁/鎂合金微弧氧化技術(shù)的研究及應(yīng)用現(xiàn)狀[J];材料保護;2010年04期

8 孫衍樂;宣天鵬;徐少楠;張敏;;鋁合金的陽極氧化及其研發(fā)進展[J];電鍍與精飾;2010年04期

9 陳東初;李文芳;揭軍;彭繼華;;AZ91D鎂合金表面微弧氧化陶瓷膜微觀結(jié)構(gòu)與組成的研究[J];稀有金屬材料與工程;2009年S2期

10 呂維玲;馬穎;陳體軍;徐衛(wèi)軍;楊健;郝遠;;氧化時間對AZ91D鎂合金微弧氧化膜微觀組織和性能的影響[J];中國有色金屬學(xué)報;2009年08期

相關(guān)博士學(xué)位論文 前2條

1 劉妍;AZ91D鎂合金微弧氧化工藝及成膜行為研究[D];浙江大學(xué);2012年

2 王燕華;鎂合金微弧氧化膜的形成過程及腐蝕行為研究[D];中國科學(xué)院研究生院（海洋研究所）;2005年

相關(guān)碩士學(xué)位論文 前4條

1 李慶陽;AZ31鎂合金原位生長耐磨陶瓷膜層研究[D];哈爾濱工業(yè)大學(xué);2011年

2 李新波;鎂合金微弧氧化封孔研究[D];長安大學(xué);2007年

3 張先鋒;鎂合金微弧氧化陶瓷層生長過程及耐蝕性能的研究[D];西安理工大學(xué);2004年

4 張志富;鎂合金腐蝕與防護的研究[D];西北工業(yè)大學(xué);2004年

，

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