添加装载缓蚀剂纳米管溶胶-凝胶涂层的缓蚀自修复行为

Anti-corrosion Self-healing Behavior of Sol-gel Coating with Nano-tube Loaded with Inhibitor

以P25纳米颗粒为前驱体,利用水热法制备了钛酸盐纳米管,并将苯并三唑(BTA)装载于钛酸盐纳米管中,然后将含有BTA的纳米管(简称纳米管)加入到溶胶-凝胶涂层中。利用紫外分光光度计测量了BTA在不同pH酸性溶液中的释放效应。通过微区电化学、盐雾试验等研究了含纳米管涂层的缓蚀自修复行为。结果表明:随着溶液pH的降低,BTA的释放量逐渐增大;经纳米管改性涂层的防腐蚀性能明显增加,且当涂层破损后,BTA可被释放,对铝合金基体起到保护作用,阻碍基体被外界介质腐蚀,从而使涂层具有缓蚀自修复能力。

Using P25 nanoparticles as precursor,titanate nanotubes were prepared by hydrothermal method.Benzotriazole(BTA)was loaded into the titanate nanotubes,and then the BTA-containing nanotubes(referred to as nanotubes)were added to sol-gel coating.A UV spectrophotometer was used to measure the release of BTA in acidic solutions with different pH.The corrosion-inhibiting and self-healing behavior of the coating containing nanotubes was studied through micro-area electrochemistry and salt spray tests.The results showed that as the pH of the solution decreased,the releasing amount of BTA gradually increased;the anti-corrosion performance of the nanotube-modified coating increased significantly.And when the coating was damaged,BTA could be released to protect the aluminum alloy substrate and prevent the substrate from being corroded by external media,so that the coating had a corrosion-inhibiting and self-healing ability.