【摘要】：隨著現(xiàn)代工業(yè)及科學(xué)技術(shù)的發(fā)展,鋁合金材料用量越來越多,但其耐磨、耐沖刷燒蝕、耐蝕性能較差,大大限制了其應(yīng)用領(lǐng)域,亟待一種表面處理技術(shù)來解決。微弧氧化作為一種新興的表面處理技術(shù)解決了上述應(yīng)用難題,并在生產(chǎn)實踐中取得了很好的效果。目前關(guān)于鋁合金的微弧氧化研究一般多見于硬鋁系列合金,而鑄造鋁合金由于含硅量較高,且硅元素有礙于微弧氧化,因此關(guān)于鑄造鋁合金的微弧氧化研究相對較少。為此,本文采用雙極性非對稱脈沖電源,對鑄造鋁合金微弧氧化過程中主要影響因素及膜層性能進行了較為系統(tǒng)地研究,將膜層厚度、硬質(zhì)層的硬度,硬質(zhì)層的比例作為主要指標(biāo),來研究氧化時間、電源參數(shù)、電解液濃度等對膜層的影響,通過實驗了解鑄造鋁合金微弧氧化的基本規(guī)律。首先,對微弧氧化技術(shù)進行了簡介,并對微弧氧化技術(shù)在國內(nèi)外發(fā)展及應(yīng)用情況進行了綜述。接著,對微弧氧化膜層的生長機制進行了研究分析,分析了產(chǎn)生微弧氧化電擊穿的原因。然后,利用渦流測厚儀、X射線衍射儀、掃描電鏡等檢測儀器,以ZL101為材料,在弱堿性電解液中進行大量微弧氧化試驗。對不同氧化時間、電解液參數(shù)、電參數(shù)等參數(shù)下制備的氧化膜的厚度、硬質(zhì)層的硬度、硬質(zhì)層的比例進行了研究,得出了參數(shù)對氧化膜的影響規(guī)律;最后,進行了陶瓷膜摩擦磨損量和摩擦系數(shù)與摩擦?xí)r間的實驗;微弧氧化、鍍硬鉻和熱噴涂三種金屬改性處理試樣的磨損特性之對比實驗;摩擦系數(shù)隨載荷的變化情況的實驗,探討了某些工藝參數(shù)與摩擦磨損特性的關(guān)系。結(jié)果表明,微弧氧化膜層制備工藝參數(shù)的變化直接影響氧化膜的性能,通過對工藝參數(shù)的控制和優(yōu)化,可以實現(xiàn)對微弧氧化膜層生長過程的預(yù)測、控制與優(yōu)化,從而制備與基體結(jié)合強度高、耐磨性能優(yōu)異的微弧氧化膜層。
[Abstract]:With the development of modern industry and science and technology, more and more aluminum alloy materials are used, but its wear resistance, erosion resistance and corrosion resistance are poor, which greatly limits its application field, and needs a surface treatment technology to solve the problem. As a new technology of surface treatment, micro-arc oxidation has solved the problems mentioned above, and has achieved good results in production practice. At present, the research on micro-arc oxidation of aluminum alloy is usually found in hard aluminum alloy series, but the micro-arc oxidation research of cast aluminum alloy is relatively rare because of the high silicon content and the fact that silicon element is hindering the micro-arc oxidation. In this paper, the main influencing factors and properties of casting aluminum alloy during micro-arc oxidation are studied systematically by using bipolar asymmetric pulse power supply. The thickness of the film and the hardness of the hard layer are studied. The effects of oxidation time, power supply parameters and electrolyte concentration on the film layer were studied by using the ratio of hard layer as the main index, and the basic law of micro-arc oxidation of cast aluminum alloy was studied through experiments. Firstly, the microarc oxidation technology is briefly introduced, and its development and application at home and abroad are reviewed. Then, the growth mechanism of the microarc oxide film was analyzed, and the reason of the breakdown was analyzed. Then, a large number of micro-arc oxidation tests were carried out in weak alkaline electrolyte by means of eddy-current thickness meter, X-ray diffractometer and scanning electron microscope, using ZL101 as the material. The thickness of oxide film, the hardness of hard layer and the proportion of hard layer were studied under different oxidation time, electrolyte parameters and electrical parameters. Experiments on friction and wear amount, friction coefficient and friction time of ceramic film, comparison of wear characteristics of three kinds of metal modified samples, such as micro-arc oxidation, hard chromium plating and thermal spraying, were carried out. The relationship between some technological parameters and friction and wear characteristics is discussed. The results show that the change of the process parameters directly affects the performance of the oxide film. Through the control and optimization of the process parameters, the prediction, control and optimization of the growth process of the micro-arc oxide film can be realized. Thus, the micro-arc oxide film with high bonding strength and excellent wear resistance was prepared.
【學(xué)位授予單位】：哈爾濱工業(yè)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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