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脈沖頻率對(duì)鎂合金微弧氧化膜層在仿生液中耐蝕性的影響
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國(guó)家自然科學(xué)基金（51305036，51072057）；國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（2012CB619100）


Effect of Pulse Frequency on the Corrosion Behavior of Microarc Oxidation Coating on Mg Alloys in SBF
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    摘要:

    研究了微弧氧化過程中不同電源脈沖頻率下制備的膜層在仿生液中的電化學(xué)腐蝕行為。對(duì)膜層及腐蝕產(chǎn)物的微觀組織，孔隙率，腐蝕形貌及相組成進(jìn)行了分析。采用動(dòng)電位極化曲線(Tafel)和電化學(xué)阻抗譜（EIS）法對(duì)膜層的耐腐蝕性能進(jìn)行評(píng)價(jià)。結(jié)果表明，脈沖頻率對(duì)AZ31鎂合金微弧氧化膜層的耐蝕性有重要影響，隨著頻率的增加，腐蝕電流密度減小，而電化學(xué)阻抗增大。因此在本研究范圍內(nèi)，頻率3000 Hz下制備的微弧氧化膜層具有最強(qiáng)的耐腐蝕性能。

    Abstract:

    The corrosion behavior of microarc oxidation (MAO) coatings prepared on AZ31 Mg alloys at 50, 100, 300, 500, 1000 and 3000 Hz was studied in simulated body fluid (SBF). The microstructure, porosity, and chemical phase composition of the samples before and after corrosion were analyzed. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were employed to characterize the corrosion performance. The results show that pulse frequency plays an important role on the corrosion resistance of the MAO coating. The corrosion current density decreases and electrochemical impedance increases with the increase of the pulse frequencies, which result from the dense microstructure at high frequency. The coating produced at 3000 Hz exhibits the largest corrosion resistance with the densest morphology in the present study.

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顧艷紅,寧成云,余遵雄,李紅龍,熊文名,陳玲玲.脈沖頻率對(duì)鎂合金微弧氧化膜層在仿生液中耐蝕性的影響[J].稀有金屬材料與工程,2014,43(10):2463~2468.[Gu Yanhong, Ning Chengyun, Yu Zunxiong, Li Honglong, Xiong Wenming, Chen Lingling. Effect of Pulse Frequency on the Corrosion Behavior of Microarc Oxidation Coating on Mg Alloys in SBF[J]. Rare Metal Materials and Engineering,2014,43(10):2463~2468.]
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  • 收稿日期:2013-12-23
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  • 在線發(fā)布日期: 2015-04-07
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