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SO2大氣中AZ91D鎂合金的腐蝕規(guī)律
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國家自然科學(xué)基金項(xiàng)目(50601012)；教育部科學(xué)技術(shù)研究重點(diǎn)項(xiàng)目(208068); 江西省高等學(xué)校重點(diǎn)實(shí)驗(yàn)室研究項(xiàng)目(GJJ08520)資助


Corrosion Behavior of AZ91D Magnesium Alloy in Atmosphere Containing SO2
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    摘要:

    通過室內(nèi)模擬實(shí)驗(yàn)，研究了含體積分?jǐn)?shù)4×10-6SO2大氣中AZ91D鎂合金的腐蝕行為。利用原子力顯微鏡、金相顯微鏡和掃描電鏡觀察腐蝕形貌，用XRD分析腐蝕產(chǎn)物。AZ91D鎂合金腐蝕1200 h的增重變化分為2個階段，第1階段符合線性增加規(guī)律，第2階段符合指數(shù)衰減規(guī)律。腐蝕過程中，β相作為陰極，α相作為陽極，在其上形成顆粒狀腐蝕產(chǎn)物，產(chǎn)物不斷增多蔓延，直至完全覆蓋鎂合金表面。同時，在這層產(chǎn)物的裂紋處出現(xiàn)大顆粒產(chǎn)物。腐蝕產(chǎn)物主要為MgO，Mg(OH)2，MgSO3·6H2O，MgSO4·6H2O，隨著腐蝕時間的延長，MgO與Mg(OH)2的量減少，而MgSO3·6H2O和 MgSO4·6H2O的量增加。

    Abstract:

    The corrosion behavior of AZ91D magnesium alloy was studied in atmosphere containing 4×10-6 SO2 (volume fraction) by indoor simulation experiment. Corrosion morphology was observed by atomic force microscopy (AFM), optical microscopy (OM) and scanning electron microscopy (SEM). Corrosion products were analyzed by X-ray diffraction (XRD). The mass gain of AZ91D magnesium alloy during the corrosion period of 1200 h can be divided into two stages. The first stage accords with linear increase law, and the second stage accords with exponential decrease law. β phase is protected as cathode, and granular corrosion products are formed in α phase as anode. The corrosion products grow outward until the continuous corrosion layer is formed. Meanwhile, large granular corrosion products appear in the cracks of corrosion layer. The corrosion products mainly consist of MgO, Mg(OH)2, MgSO3·6H2O and MgSO4·6H2O. The quantity of MgO and Mg(OH)2 is decreased, while the quantity of MgSO3·6H2O and MgSO4·6H2O is increased for a longer corrosion time

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林 翠,梁健能. SO2大氣中AZ91D鎂合金的腐蝕規(guī)律[J].稀有金屬材料與工程,2011,40(3):499~502.[Lin Cui, Liang Jianneng. Corrosion Behavior of AZ91D Magnesium Alloy in Atmosphere Containing SO2[J]. Rare Metal Materials and Engineering,2011,40(3):499~502.]
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  • 收稿日期:2010-03-26
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