A sol-bath-gel approach to prepare hybrid coating for corrosion protection of aluminum alloy
A sol-bath-gel approach to prepare hybrid coating for corrosion protection of aluminum alloy
复制标题
溶胶-浴-凝胶方法制备铝合金腐蚀防护杂化涂层
DOI：
10.1016/j.surfcoat.2015.08.032
复制
发表时间：
2015-10-15
影响因子：
5.4
通讯作者：
Zhang, Shengtao
中科院分区：
文献类型：
--
作者：
Li, Lingjie;He, Jianxin;Zhang, Shengtao
采用溶胶-浴-凝胶法制备了铝合金防腐蚀复合涂层。溶胶-浴-凝胶处理包括将铝合金在50 ° C下浸入硅烷溶胶中30分钟，缓慢取出，然后在室温下干燥。该方法克服了传统溶胶-凝胶法的缺点，同时保留了溶胶-凝胶法和化学浴法的优点。采用数字显微镜、原子力显微镜（AFM）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）和能量色散谱（EDS）等分析手段对复合涂层的形貌和成分进行了表征。采用动电位极化曲线、电化学阻抗谱（EIS）等测试方法，研究了复合镀层的耐蚀性和耐久性，并与传统铬酸盐镀层进行了比较。结果表明，铝合金表面形成了一层连续、均匀、致密的氢氧化铝-硅烷杂化膜。200 nm的颗粒阵列，其紧密且规则地堆积。所制备的混合涂层的耐腐蚀性为32，395 Ω cm（2），其高于铬酸盐转化涂层的耐腐蚀性（12，094 Ω cm（2））。该涂层抑制了铝合金基体的阳极溶解，使腐蚀电流大幅下降，具有长期保护作用。(C)2015 Elsevier B. V.版权所有。
We developed a sol-bath-gel method to prepare a hybrid coating for corrosion protection of aluminum alloy. The sol-bath-gel treatment included dipping the aluminum alloy into silane sol at 50 degrees C for 30 min, slowly withdrawing it, and then drying at room temperature. This procedure overcame the drawbacks of conventional sol-gel methods while retaining the advantages of sol-gel and chemical bath approaches. The morphology and compositions of the as-prepared hybrid coating were characterized by digital microscopy, atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometry (FTIR), and energy dispersive spectroscopy (EDS) mapping. The corrosion resistance and durable protection ability of the as-prepared hybrid coating were investigated and compared with the traditional chromate coating by the potentiodynamic polarization technique, and electrochemical impedance spectroscopy (EIS). The results showed that the aluminum alloy surface is coated with a continuous, homogeneous, and compact aluminum (hydr)oxide-silane hybrid film, which is composed of ca. 200 nm particle array that was tightly and regularly packed. The corrosion resistance of the as-prepared hybrid coating was 32,395 Omega cm(2), which is higher than that for the chromate conversion coating (12,094 Omega cm(2)). The as-prepared coating suppresses the anodic dissolution of the aluminum alloy substrate, resulting in a large decrease in corrosion current and long-term protection. (C) 2015 Elsevier B.V. All rights reserved.