摘要
采用傅立叶变换红外光谱分析了2A12-T6铝合金表面自组装双-(!-三乙氧基硅丙基)四硫化物硅烷偶联剂(SCA)薄膜结构特征,并采用电化学极化曲线评价了薄膜的耐蚀性能.结果表明,铝材表面自然晾干,SCA薄膜分子之间主要通过氢键连接,腐蚀电流密度减小1个数量级以上.120℃的加热处理促进铝板表面通过SiOSi链接而形成SCA网状薄膜结构,并通过在界面上形成SiOAl界面相结构而与铝板表面牢固连接,腐蚀电流密度降低2个数量级以上.SCA乙醇溶液浸泡处理10min比浸泡2s～1min的铝板表面SCA薄膜内氢键缔合羟基要多.
Bis-[triethoxysilylpropyl] tetrasulfide silane films were self-assembled on surface of 2Al2-T6 aluminum alloy for corrosion protection. The structure of the formed silane films was investigated by using Fourier transform infrared （FTIR） spectroscopy, and the corrosion performance of the film was evaluated by electrochemical potentiodynamic polarization tests in 3.5% NaCl solution. Compared to the untreated case, both the cathodic and anodic reactions of Al2Al2-T6 treated with the silane films are inhibited obviously. For the film on the surface of Al2Al2-T6 aged at room temperature the corrosion current density is reduced by more than 1 order of magnitude, which is due to the hydrogen bonding between silane molecules and surface of 2Al2-T6. For the film on the surface of Al 2Al2-T6 cured at temperature of 120℃ for 40 rain the silane molecules are cross linked through SiOSi, which is closely linked to Al 2Al2-T6 surface through formation of SiOAl. The corrosion current density is reduced by more than 2 orders of magnitude. There exist more hydrogen bonded hydroxy groups in the cured film dipped for 10 min in the prepared silane solution than that dipped for 2 s to 1 min.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2006年第8期1025-1029,共5页
Acta Physico-Chimica Sinica
基金
湖南省自然科学基金(05JJ20015)重点资助项目
