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微弧氧化鈦合金的電化學(xué)腐蝕行為
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國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（“973”計(jì)劃）（2007CB607605）


Electrochemical Corrosion Behaviors of Micro-arc Oxidation Titanium Alloy
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    摘要:

    采用微弧氧化技術(shù)在TC4鈦合金表面制備了多孔陶瓷層，研究了其在Hank′s模擬體液中的電化學(xué)腐蝕行為，利用SEM和XRD分析了其表面形貌和物相組成。結(jié)果表明，微弧氧化合金的自腐蝕電位升高約0.3 V，提高了TC4鈦合金在生物體液環(huán)境下的化學(xué)穩(wěn)定性。在鈦合金植入體電位范圍內(nèi)，微弧氧化處理可明顯提高極化電阻，減少腐蝕電流1~2個(gè)數(shù)量級(jí)。隨腐蝕時(shí)間的延長(zhǎng)，TC4鈦合金表面鈍化膜逐漸發(fā)生腐蝕，而微弧氧化膜浸泡初期HA的形核及生長(zhǎng)是電極反應(yīng)中最活躍部分，2周后表面形成均勻的HA薄膜，表現(xiàn)出良好的抗電化學(xué)腐蝕性能。

    Abstract:

    The porous ceramic layer was prepared on the surface of Ti6Al4V (TC4) alloy by a micro-arc oxidation (MAO) method. The electrochemical corrosion behaviors were investigated in the condition of Hank's simulated body fluid. The surface morphologies and phases were analyzed by SEM and XRD. The experimental results show that the free corrosion potential of MAO TC4 alloy increases by about 0.3 V, resulting in improving the chemical stability of TC4 alloy in the biological fluid environments. In the potential range of the titanium alloy implants, the MAO treatment can increase the polarization resistance and reduce the corrosion current by one to two orders-of-magnitude. With the increasing of the corrosion time, the passive film on the surface of TC4 alloy is gradually corroded in Hank's simulated body fluid. The nucleation and growth of HA is the most active part of the electrode reactions for MAO layer at the early immersion. After two weeks, the uniform HA film will form on the surface of MAO TC4 alloy, which shows the good electrochemical corrosion resistance.

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黃傳輝,王慶良,史興嶺.微弧氧化鈦合金的電化學(xué)腐蝕行為[J].稀有金屬材料與工程,2012,41(7):1161~1165.[Huang Chuanhui, Wang Qingliang, Shi Xingling. Electrochemical Corrosion Behaviors of Micro-arc Oxidation Titanium Alloy[J]. Rare Metal Materials and Engineering,2012,41(7):1161~1165.]
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  • 收稿日期:2011-07-20
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