摘要
采用电解液修饰法,利用微弧氧化技术直接在铝基体上制备CoO/Al2O3微弧氧化复合膜层,采用SEM和XRD观察并分析复合膜层表面、截面形貌和相组成,探讨了复合膜层形成机制及对甲基橙溶液催化降解作用。结果表明,微弧氧化复合膜层主要由Al2O3相和CoO相组成,且CoO沉积在Al2O3陶瓷层表面或者孔洞内;碱性电解液中添加Co(CH3COO)2生成Co(OH)2胶体,从而在热化学作用下分解为CoO,是形成CoO/Al2O3复合膜层的主要原因;室温常压下复合膜层催化10 h可使甲基橙溶液降解率达到96.4%。
CoO/Al2O3 composite films on the aluminum substrate were prepared by micro-arc oxidation technology with the doping electrolyte. The surface microstructure and phases of the composite films were investigated and analyzed by SEM and XRD, respectively. The formation mechanism of the composite films and the catalytic degradation of methyl orange by CoO/Al2O3 composite films were discussed. The results show that micro-arc oxidation films mainly consist of CoO and Al2O3phases, and CoO phase is deposited onto the surface or into the hole of A1203 ceramic layer. Co（OH） 2 colloid is formed due to the addition of Co（ CH3 COO）2 in alkaline electrolyte, and CoO is formed owing to the decomposition of Co（OH） 2 colloid under the thermal chemical action, this is attributed to the formation of CoO/Al2O3 composite films. The degradation rate of methyl orange reaches 96. 4% by the catalysis of the CoO/AAl2O3 composite films for 10 h.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第2期138-142,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51071121)
材料腐蚀与防护四川省重点实验室开放基金(2013CL09)
