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2A97鋁鋰合金等離子電解氧化膜的制備和耐蝕性能
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更新時間：2015-08-21
研究2A97鋁鋰合金在硅酸鹽電解液中等離子電解氧化膜的生長規(guī)律，分析直流條件下電流密度、氧化時間等電參數(shù)對氧化陶瓷膜的表面和截面形貌、成分和相組成以及耐蝕性的影響。
2A97鋁鋰合金等離子電解氧化膜的制備和耐蝕性能Preparation and corrosion resistance of plasma electrolytic
oxidation coatings on 2A97 aluminium-lithium alloy
研究2A97鋁鋰合金在硅酸鹽電解液中等離子電解氧化膜的生長規(guī)律，分析直流條件下電流密度、氧化時間等電參數(shù)對氧化陶瓷膜的表面和截面形貌、成分和相組成以及耐蝕性的影響。結(jié)果表明：等離子電解氧化處理提高了鋁鋰合金的耐腐蝕性能，但處理時間過長，膜層微觀結(jié)構(gòu)中缺陷增多，對膜層的耐蝕性帶來不利影響，提高電流密度對膜層的耐蝕性也沒有明顯的影響。鋁鋰合金的等離子電解氧化膜微觀結(jié)構(gòu)中存在兩類不同放電類型導致的特征結(jié)構(gòu)，其中來源于基體/膜層界面的火花放電生成的結(jié)構(gòu)含有較多的Al，而氧化膜表層或淺層的火花放電主要在膜層表面生成含有較多電解液成分的菜花狀結(jié)構(gòu)。膜層的相結(jié)構(gòu)主要為γ-Al2O3。
The plasma electrolytic oxidation(PEO) processes of 2A97
aluminium-lithium alloy in silicate electrolyte were studied. The PEO processes
were carried out with DC regime, and the factors such as current density and
treatment time on the morphologies of surface and the cross section of the
coatings and the corrosion resistance of coatings were analyzed. The results
show that the PEO processing enhances the corrosion resistance of the
aluminium-lithium alloy, however, the corrosion resistance will be deteriorated
by long processing time, due to more defects developed in the coatings, and the
corrosion resistance of the coatings is also little affected by increasing the
current density. There are two types of microstructures existing in the PEO
coatings of aluminium-lithium alloy, which are resulted from the different types
of discharging. The microstructure resulted from the discharge originated at
substrate/coating interface contains more content of Al, while the discharge
happening on the surface or shallow depth of PEO coating causes the formation of
the cauliflower-like structure with electrolyte species on the surface of the
PEO coatings. The main phase composion of the coatings is
γ-Al2O3.
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