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Effect of Ca on Corrosion Resistance Behavior of as-Cast AZ91 Magnesium Alloys
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Effect of Ca on Corrosion Resistance Behavior of as-Cast AZ91 Magnesium Alloys
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Shanxi Province’s Patent (121004); The Graduate Student Outstanding Innovation Project of Shanxi Province (02100342)

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    摘要:

    研究了0.5，1.0和1.5（質(zhì)量分?jǐn)?shù)，%，下同）的Ca對鑄態(tài)AZ91鎂合金微觀組織和耐蝕性的影響。利用OM、SEM/EDS和XRD觀察金相組織、進(jìn)行微觀分析和確定相組成。分別采用靜態(tài)失重腐蝕、電化學(xué)腐蝕和鹽霧腐蝕對不同成分的AZ91合金進(jìn)行實驗。結(jié)果表明，0.5Ca的存在沒有形成任何新的金屬間相，而是通過溶解于第二相和基質(zhì)中抑制β-Mg17Al12相的不連續(xù)沉淀。AZ91-1.0Ca合金耐蝕性最好。AZ91-1.0Ca和AZ91-1.5Ca合金中出現(xiàn)了骨狀的Al4Ca相，并且β相尺寸顯著下降。在AZ91-1.0Ca合金中，β相分布十分均勻。因此，可以認(rèn)為，隨著不同含量Ca的加入，鑄態(tài)AZ91鎂合金耐蝕性的變化是由于其微觀組織的變化而引起的。

    Abstract:

    The effects of Ca on the microstructures and the corrosion resistance of as-cast AZ91 alloys with contents of 0.5 wt%, 1.0 wt% and 1.5 wt% Ca were investigated. Constant immersion technique, potentiodynamic polarization and salt spray test were employed to determine the corrosion resistance of AZ91 alloys. Morphological characterization by optical microscope (OM), microanalysis by scanning electron microscopy (SEM)/energy dispersed spectroscopy (EDS) and phase identification by X-ray diffractometry (XRD) indicate that the presence of 0.5 wt% Ca does not form any new intermetallic phase but restrains the discontinuous precipitation of the β-Mg17Al12 phase through dissolution in both the second phase and magnesium matrix. The AZ91 alloy with the addition of 1.0 wt% Ca exhibits the optimal corrosion resistance. Al4Ca phase in bone-like morphology appears in the alloys with a larger quantity of Ca (1.0 wt% and 1.5 wt%), in line with a marked size reduction of the β-Mg17Al12 phase. The β-Mg17Al12 phase is distributed uniformly among the matrix of the AZ91-1.0Ca alloy. The variation of the corrosion resistance of the as-cast AZ91 alloys with the addition of Ca is attributed to the change of the microstructure.

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馮 沖,李明照,侯 陽,王海燕,李曉艷,范劉群. Effect of Ca on Corrosion Resistance Behavior of as-Cast AZ91 Magnesium Alloys[J].稀有金屬材料與工程,2015,44(1):41~47.[Feng Chong, Li Mingzhao, Hou Yang, Wang Haiyan, Li Xiaoyan, Fan Liuqun. Effect of Ca on Corrosion Resistance Behavior of as-Cast AZ91 Magnesium Alloys[J]. Rare Metal Materials and Engineering,2015,44(1):41~47.]
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  • 收稿日期:2014-01-17
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  • 在線發(fā)布日期: 2015-05-22
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