(北京航空航天大學(xué) 材料科學(xué)與工程學(xué)院，北京 100191)
摘 要: 通過表面形貌觀察、升壓曲線測試、電化學(xué)阻抗譜(EIS)測試和疲勞性能測試等研究LY12鋁合金鉻酸陽極氧化(CAA)、硼酸−硫酸陽極氧化(BSAA)和己二酸−硫酸陽極氧化(ASAA)膜的性能。結(jié)果表明：CAA膜和 ASAA膜缺陷較少且缺陷邊緣光滑，BSAA膜缺陷數(shù)目較多且邊緣較為粗糙。3種氧化膜的耐蝕性良好，在5% NaCl(質(zhì)量分?jǐn)?shù))溶液中浸泡80 d后，均未出現(xiàn)明顯的破壞。對比氧化膜的壁壘層阻抗(Rb)發(fā)現(xiàn)，BSAA的Rb值下降最大，約為94%，CAA和ASAA優(yōu)于前者，其阻抗分別下降了75%和78%。3種陽極氧化技術(shù)對基體疲勞性能的影響結(jié)果表明，CAA處理降低基體的疲勞壽命值最小，約為14%；ASAA次之，約為20%；BSAA對基本疲勞性能的影響最大，約25%。
關(guān)鍵字: LY12鋁合金；陽極氧化膜；鉻酸陽極氧化；硼酸−硫酸陽極氧化；己二酸−硫酸陽極氧化
（School of Materials Science and Engineering, Beihang University, Beijing 100191, China）
Abstract:The properties of anodic films formed in chromic, boric-sulfuric and adipic-sulfuric acid (CAA, BSAA and ASAA, respectively) on LY12 aluminum alloy were studied by morphology characterization, current-voltage response test, electrochemical impedance spectroscopy (EIS) and fatigue test methods. It is indicated that in contrast with BSAA film, CAA and ASAA films have less defects and a smoother periphery. All of three kinds of anodic films have perfect corrosion resistant after immersed in 5% NaCl solution for 80 d. The resistance value (Rb) of the barrier layers of BSAA decreases in greatest, while the Rb values of CAA and ASAA decrease by 75% and 78%, respectively. From fatigue test results, it is confirmed that CAA reduces the fatigue life of the matrix at a little, about 14%, ASAA, about 20%, and BSAA about 25%, indicating that BSAA has the greatest impact on the fatigue life of the matrix among the three treatments.
Key words: LY12 aluminum alloy; anodic films; chromic acid anodization; boric-sulfuric acid anodization; adipic- sulfuric acid anodization
