2006-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/712073摘要：鎂合金因質輕與比強度、比剛性高，而廣泛用於電子產業與運需工具上。然而，鎂合金性質活潑容易銹蝕，必須藉由適當表面處理，提高鎂合金的抗蝕性、抗磨耗能力並提升後續塗裝的加工性。本三年期研究計畫針對目前業界常用的AZ31與AZ91鎂鋁合金和塑性加工性優異的鎂鋰合金進行非鉻系化成處理與陽極化處理，特別著重於皮膜微結構分析、成長機制與色澤調控。化成處理系統包括酸性的硝酸鈰與磷酸鹽/錳酸鹽系統，及鹼性的錫酸鹽系統。陽極處理則主要以鹼性電解液為主，並以各種酸根與陰離子來促進皮膜均勻性，同時進行色澤調控。另外，選擇火花放電的陽極處理系統，加入具有色澤的次微米或奈米粉體，以進行表面著色。經表面處理試片，先以OM進行色澤量測，以x-射線繞射分析皮膜結晶型態與相組成，以SEM進行表面形貌觀察，以橫截面TEM鑑定微結構與成分。接著，量測其耐蝕性與皮膜附著性，並以TEM和x-光光電子能譜儀解析腐蝕生成物形貌、微結構與成分。藉由『電解液系統與組成/操作參數/皮膜微結構/試片性質』關係的建立，獲得非鉻系的鎂合金表面處理液與其操作參數。<br> Abstract: In light of their low density and high specific strength and stiffness, magnesium alloys are extensively used in electrical appliances and transportation vehicles. However, most of the magnesium alloys are relatively reactive and tend to suffer corrosion. Consequently, surface modifications are performed to enhance the corrosion resistance, wear resistance and paint adhesion of the base magnesium alloys. This three-year project aims at developing a non-chromate conversion coating and anodization treatment for AZ31, AZ91 and MgLi magnesium alloys, with emphasis on the understanding of the microstructure, formation mechanism and resultant color of the coating. The conversion coating treatment is conducted in cerium nitrate and phosphate/permanganate solutions, or in an alkaline stannate solution. The solution for anodization treatment is basically the alkaline solution with the addition of various anions. These additives can promote the formation of uniform coating and modify the color of the coating. Furthermore, colored powders of sub-micrometer and nanometer in size are introduced to the solution, in which sparking occurs on magnesium plates, so as to coat the plate with specific color. The color and uniformity of the coating is examined by OM. The microstructure and composition of the conversion coating are characterized using XRD, SEM and cross-sectional TEM. The properties of the coating are evaluated including corrosion resistance, film and paint adhesion. Additionally, the morphology, microstructure and composition of the corrosion products are characterized using TEM and XPS (X-ray photoelectron spectroscopy). Finally, a non-chromate solution together with its processing parameters for producing the coating on magnesium alloys will be established through the “solution composition / processing parameters / film microstructure / film properties” relationship.鎂鋁合金鎂鋰合金非鉻系化成處理陽極處理附著性magnesium aluminum alloysmagnesium lithium alloysnon-chromate conversion coating treatmentanodizationadhesion