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AZ91D鎂合金外加電場下自封孔微弧氧化膜層微觀形貌及耐蝕性的研究
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長安大學(xué) 材料科學(xué)與工程學(xué)院,長安大學(xué) 材料科學(xué)與工程學(xué)院,長安大學(xué) 材料科學(xué)與工程學(xué)院,長安大學(xué) 材料科學(xué)與工程學(xué)院,山東交通學(xué)院 海運學(xué)院

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國家自然科學(xué)基金資助(項目號51301022),陜西省自然科學(xué)基金(項目號2016JQ5032)


The Research on Microstructure and Corrosion Resistance of Applied Electricity with Self-sealing and Micro-arc Oxidation Coatings of AZ91D Magnesium Alloys
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Material Science Engineering School,Chang’an University,Xi’an,Material Science Engineering School,Chang’an University,Xi’an,Material Science Engineering School,Chang’an University,Xi’an,Material Science Engineering School,Chang’an University,Xi’an,Maritime College,ShanDong JiaoTong University

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    摘要:

    微弧氧化技術(shù)可以實現(xiàn)對金屬表面的高耐蝕、耐磨等改性,傳統(tǒng)微弧氧化所得陶瓷膜具有多孔結(jié)構(gòu),影響了其耐蝕性能及高溫氧化性能。本文針對氧化膜多孔結(jié)構(gòu)與腐蝕性能之間的關(guān)系開展基礎(chǔ)研究。采用外加電場微弧氧化技術(shù)實現(xiàn)自封閉孔結(jié)構(gòu),并研究了不同孔結(jié)構(gòu)膜層的耐蝕性能；討論了封孔過程中膠體運動-電位-孔結(jié)構(gòu)表征之間的規(guī)律性關(guān)系,評價了自封孔后膜層腐蝕性能。主要研究結(jié)果表明：膜層中的多孔結(jié)構(gòu)是腐蝕介質(zhì)的通道,自封孔后耐蝕性能提高,此外,耐蝕性與孔隙率及封孔填充物的成分和形態(tài)具有極大的相關(guān)性,通過調(diào)整外加電場強度和時間可以實現(xiàn)對自封孔的調(diào)控,從而改善耐蝕性能。

    Abstract:

    Metal surface corrosion and wear can be improved by micro-arc oxidation. The micro-arc oxidation coatings commonly exhibited porous structure, which is considered to be main reason for failure of corrosion resistance and high temperature oxidation resistance. Arsing of that, in this paper, the corrosion resistant properties of micro-arc oxidated coatings was improved by self-sealing microstructure through an applied electric field. The relationship between the porous structure of the oxidation coatings and corrosion was investgated by microstructure anylisis. Meanwhile, regularity relations of colloid motion-potential-porous structure during sealing process was discussed and the corrosion resistance of the coatings after self-sealing was evaluated by electrochemical corrosion test. The main results showed that the porous structure of the coatings is the channel corrosive medium, and corrosion resistance can be improved by the self-sealing. In addition, corrosion resistance exhibited significant dependence on porosity, composition and morphology of sealings. It is known from this paper, the corrosion resistance can be improved by self-sealing microstructure obtained by applied electric field.

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陳宏,黃杰,陳永楠,郝建民,丁業(yè)立. AZ91D鎂合金外加電場下自封孔微弧氧化膜層微觀形貌及耐蝕性的研究[J].稀有金屬材料與工程,2017,46(10):3098~3104.[Chen Hong, Huang Jie, Chen Yongnan, Hao Jianmin, Ding Yeli. The Research on Microstructure and Corrosion Resistance of Applied Electricity with Self-sealing and Micro-arc Oxidation Coatings of AZ91D Magnesium Alloys[J]. Rare Metal Materials and Engineering,2017,46(10):3098~3104.]
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  • 收稿日期:2016-08-12
  • 最后修改日期:2016-12-15
  • 錄用日期:2017-01-06
  • 在線發(fā)布日期: 2017-12-01
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