摘要
为提高铝合金耐蚀性,用酒石酸阳极氧化工艺处理铝合金表面,研究氧化时间对酒石酸氧化膜厚度、微观形貌、物相、耐腐蚀性的影响。结果表明:随时间从25 min延长到65 min,氧化膜厚度从7.6μm增到15.3μm,平整度和致密性明显变化,孔隙率先降后升,耐腐蚀性先升后降。氧化膜的物相组成未随时间延长发生明显变化。适当延长时间使氧化膜增厚,平整度和致密性逐步改善,减缓了氧化膜腐蚀。氧化55 min时获得氧化膜较厚且相对平整致密,孔隙率最低,为12.7%,电荷转移电阻和阻抗模值均最大,分别达1.73×10^(4)、9.03×10^(3)Ω·cm^(2),腐蚀失质量最低,为0.74 g/m^(2)。该氧化膜适合作表面改性层,能有效提高铝合金的耐腐蚀性。
Aluminum alloy was surface modified by tartaric acid anodic oxidation process in order to effectively improve its corrosion resistance,and the effect of oxidation time on the microstructure,thickness and corrosion resistance of tartaric acid oxidation film were studied. The results show that with the prolonging of oxidation time from 25 min to 65 min,the thickness of oxidation film increases from 7.6 μm to 15.3 μm,and the flatness and compactness change significantly. The porosity firstly decreases and then increases,which leads to gradual the corrosion resistance increase and then decrease. Firstly,the phase composition of oxidation film does not change significantly with the prolonging of oxidation time. Appropriately prolonging the oxidation time can increase the thickness and improve the flatness and compactness of oxidation film,thus slow down the corrosion of oxidation film. The oxidation film obtained as oxidation time is 55 min is thicker and relatively compact with lowest porosity of 12.7%,the charge transfer resistance and impedance values are the biggest,which was 1.73×10^(4)Ω·cm^(2) and 9.03×103Ω·cm^(2) respectively,and the corrosion weight loss is the lowest of 0.74 g/m^(2). This oxidation film is suitable for surface modification layer and can effectively improve the corrosion resistance of aluminum alloy.
作者
于海青
王金涛
王东
YU Haiqing;WANG Jintao;WANG Dong(Yantai Engineering&Technology College,Yantai 264006,China;National Quality Supervision and Inspection Center for Ceramics and Refractories,Zibo 255000,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2021年第4期65-69,共5页
Ordnance Material Science and Engineering
基金
山东省高等学校科技计划一般项目(J17KB008)。
关键词
氧化时间
酒石酸阳极氧化
酒石酸氧化膜
耐腐蚀性
oxidation time
tartaric acid anodizing
tartaric acid oxidation film
corrosion resistance
