摘要
陽極氧化技術已成為鋁合金延長使用壽命和擴大應用范圍不可缺少的關鍵,并且通過封閉處理能提高膜層的耐蝕性,耐磨性以及絕緣性。
本文采用硫酸陽極氧化法制備氧化膜,并進行不同方法的封孔處理,然后討論封閉處理對6061鋁合金陽極氧化性能的影響。主要通過調(diào)節(jié)溫度、時間、PH值來研究封閉處理對陽極氧化性能的影響。由于氧化膜的耐蝕性是決定6061鋁合金陽極氧化的最佳工藝指標,因此主要對氧化膜的耐蝕性和耐磨性進行檢測。最后利用SSX—550掃描電子顯微鏡觀察氧化膜顯微組織并照相。
氧化膜的制備采用同組同學已得出的最優(yōu)工藝:氧化時間35min,電壓14V,硫酸濃度170 g/L,溫度21℃。通過正交試驗得出封閉處理影響陽極氧化膜耐蝕性的主要因素是溫度,其次是時間,PH值影響最小。封孔后氧化膜的耐蝕性和耐磨性都有了顯著提高,而且與基體結(jié)合良好。
關鍵詞:鋁合金;封孔處理;陽極氧化;耐蝕性
Abstract
Anodized aluminum alloy technology has become the indispensable key to extend service life and expand the scope of application, and sealing treatment can improve corrosion resistance, wear resistance and insulation of the film.
In this paper, prepared oxide film by sulfuric acid anodizing, and close with different methods, and then discuss the effect of sealing treatment on anodizing performance of 6061 aluminum alloy. Study the effect of sealing treatment on anodizing performance mainly through the regulation of temperature, time and PH value. Because of the corrosion resistance of the film is the best indicators to decide anodized of 6061 aluminum alloy, mainly test the corrosion resistance and wear-resistance of the film. Finally, Observe and photograph microstructure of film through SSX-550 scanning electron microscopy.
Prepared oxide film in the optimum process designed by the same group of students: oxidation time is 35 min, voltage is 14 V, sulfate concentration is 170g/L, temperature is 21℃. Through orthogonal test it’s obtained that the main factor affecting the corrosion resistance of anodized film in the sealing treatment is temperature, secondly is time, the least impact is the PH value. After sealing the corrosion resistance and wear resistance of the oxide film have significantly increased, and the film have a good combine with the matrix.
Key words:aluminum alloy;sealing treatment;anodic oxidation;corrosion resistance