本文選題：微弧氧化 + 小陰極　； 參考：《中國表面工程》2015年03期

【摘要】：針對微弧氧化工藝中小功率電源大面積處理或局部腔體處理問題,研究小陰極微弧氧化工藝方法。采用550V恒壓模式,陽極為Φ70mm×0.5mm的純鋁樣件,陰極為Φ15mm不銹鋼棒,浸沒到硅酸鈉基的電解液內(nèi)的長度可變,探討放電伏安特性和膜層厚度、表面形貌以及電化學(xué)行為的均勻性。結(jié)果表明:小陰極可以實現(xiàn)微弧氧化,但小陰極增加了陰極-陽極間放電的等效阻抗,會造成微弧放電較弱、成膜速率較低,微弧氧化樣品的徑向膜層厚度和耐蝕性呈現(xiàn)不均勻性,靠近樣品邊緣膜層較厚,中心區(qū)域膜層較薄;增加陰極尺寸,膜厚均勻性從74%(陰極深入20mm)提高到78%(陰極深入40mm),同時膜層的耐腐蝕區(qū)域加大。結(jié)果對于小功率電源大面積微弧氧化和腔體內(nèi)部微弧氧化具有重要的指導(dǎo)意義。
[Abstract]:Aiming at the problem of large area treatment of small power supply or local cavity treatment in micro-arc oxidation process, the process method of micro-arc oxidation with small cathode is studied. A pure aluminum sample with a constant voltage mode of 550 V, a 桅 70mm 脳 0.5mm anode and a 桅 15mm stainless steel rod was used. The length of electrolyte immersed in sodium silicate was variable. The discharge voltammetry characteristics, film thickness, surface morphology and uniformity of electrochemical behavior were discussed. The results show that the micro-arc oxidation can be realized by the small cathode, but the small cathode increases the equivalent impedance of the cathode-anode discharge, which leads to the weak discharge of the micro-arc and the lower film forming rate. The radial film thickness and corrosion resistance of microarc oxidation samples show inhomogeneity, the film layer near the edge of the sample is thicker, the central area film is thin, and the cathode size is increased. The uniformity of film thickness was increased from 74% (cathode depth to 20mm) to 78% (cathode depth into 40mm), and the corrosion resistance of the film was increased. The results are of great significance for large-area micro-arc oxidation and internal micro-arc oxidation of small power supply.
【作者單位】： 佳木斯大學(xué)黑龍江省高校生物醫(yī)學(xué)材料重點實驗室;
【基金】：國家自然科學(xué)基金(31370979) 黑龍江省高校創(chuàng)新團(tuán)隊建設(shè)計劃項目(2012TD010)
【分類號】：TG174.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊建;李元東;馬穎;呂維玲;文靖;;NaOH對鋁合金A356微弧氧化膜形成及其耐蝕性的影響[J];中國表面工程;2008年05期

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