V2O5和NaVO3對鎂合金微弧氧化膜耐蝕性影響的對比

V2O5和NaVO3對鎂合金微弧氧化膜耐蝕性影響的對比Comparison of effects of V2O5 and NaVO3 on corrosion resistance of micro-arc oxidation coatings on magnesium alloys

在硅酸鹽體系中分別添加V2O5和NaVO3，在AZ91D鎂合金上制備微弧氧化膜，對比研究釩含量相同的V2O5和NaVO3對膜層耐蝕性的影響。通過TT260數字式涂層測厚儀、SEM和XRD分別檢測膜層厚度、膜層微觀形貌和相組成。采用點滴和電化學實驗研究膜層耐蝕性能。結果表明：電解液中加入V2O5和NaVO3后，膜層厚度均稍有減小，點滴耐蝕性因總厚度較薄也都有所降低，但電化學測試的耐蝕性均提高，當V2O5和NaVO3的添加量分別為0.20 g/L和0.35 g/L時，膜層的耐蝕性最佳。加入0.35 g/L NaVO3所得膜層耐蝕性比加入釩含量相同V2O5的提高3倍，比無添加劑時的高出15倍，比基體高約3個數量級，故加入NaVO3的性價比更高。同時，加入V2O5和NaVO3均可制得棕色的氧化膜，起顯色作用的物質是MgV2O4。該物相具有尖晶石結構，有助于提高膜層的耐蝕性。

The micro-arc oxidation coatings were prepared on AZ91D magnesium alloys in silicate-containing electrolyte with different V2O5 and NaVO3 concentrations, respectively. The effects of adding V2O5 and NaVO3 with same calculated content of V element on corrosion resistance of the coatings were studied. The thicknesses, morphologies and phase composition of the coatings were examined by using TT260 digital coating thickness gauge, SEM and XRD, respectively. The corrosion resistances of coatings were evaluated by spot test and electrochemical test. The results show that, after adding V2O5 and NaVO3 into the electrolyte, the coating thicknesses decrease slightly and the corrosion resistance of coating corresponding to the spot test reduces due to the thinner overall thicknesses, while the corrosion resistance in the electrochemical test increases. And the coatings best performance to anti-corrosion is exhibited when adding the least content of V2O5 and NaVO3 in the electrolyte. The corrosion resistance of coatings prepared in the electrolyte with 0.35 g/L NaVO3 is three times higher than that with the element V content of V2O5, improved by 15 times compared to that without additives, and is approximately three orders of magnitude higher than that of the substrate. Meanwhile, the brown color coatings are obtained in the electrolyte containing V2O5 or NaVO3 owing to the formation of MgV2O4 with the spinal structure, which is also helpful to improve the corrosion resistance of the coatings.

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