膦酸自组装膜在铝合金表面的吸附及缓蚀行为

The Adsorption and Corrosion Inhibition Behavior of TDPA Self-assembled Monolayers on the Surface of Aluminum Alloy

通过自组装前后铝合金表面锌电化学沉积行为的变化研究和极化曲线测试,探讨了十四烷基膦酸自组装膜在2024和1060铝合金表面的吸附及缓蚀行为。研究结果表明:锌的初期电化学沉积优先在铝合金偏析相表面进行;偏析相表面吸附膜致密度较差,因此自组装后基体和偏析相表面之间的物化性质差异更大,从而加速锌的初期沉积;1060合金表面自组装膜比2024合金表面自组装膜更为致密,因而对1060合金表面锌沉积行为的影响更显著,对1060合金阴极极化区和阳极维钝区的腐蚀抑制效果也更为明显。

Electrochemical deposition researches of zinc and polarization curves scanning on bare and assembled sample surfaces were performed to investigate the adsorption and corrosion inhibition behavior of TDPA（1-tetradecylphosphonic acid） SAMs（self-assembled monolayers） on the surfaces of 2024 and 1060 aluminum alloys.The results show that initial deposition of zinc preferentially happens on surfaces of intermetallic phase particles.And the SAMs on intermetallic phase surfaces are less dense than that on alloy base surfaces,resuting in the greater difference between the physical and chemical properties of base surfaces and intermetallic phase surfaces,which enhance the initial deposition rate of zinc on the assembled samples.The SAMs on 1060 alloy surfaces were much denser than that on 2024 alloy surfaces,which is the responsible reason for the more remarkable effect of TDPA films on the zinc deposition behavior on 1060 alloy surfaces and the more efficiency inhibition on the corrosion of cathodic polarization region and cathodic passivation region of 1060 alloy.