通过建立简易气体收集装置，研究了尿素存在与否时，手汗液中不同组分对AZ91D合金表面析氢动力学过程的影响。通过动电位极化曲线、电化学阻抗谱图等电化学测试手段，探讨了尿素对镁合金在手汗模拟液中的作用机制。发现尿素可在合金表面吸附，进而改变镁合金/腐蚀介质界面的界面电容及改变腐蚀体系中OH-离子的浓度，使合金表面容易形成具有部分保护作用的MgO膜，最终减缓了手汗液对镁合金的腐蚀，当腐蚀体系存在Cl-时，尿素的缓蚀能力变得很弱。
In this work, the inhibiting mechanism of urea on AZ91D alloy in hand sweat had been investigated by the EIS and polarization curves. It has been found that urea absorbed on the surface of magnesium alloy and changed the capacity of alloy/solution interface by the EIS, polarization curve of AZ91D in different kinds of medium with and without urea. With the addition of urea, the concentration of OH- in the corrosion medium was increased. In this case, a protective film (MgO) formed on the alloy surface and the corrosion rate was decreased. Because of competitive adsorption of Cl- and OH- on the surface of AZ91D alloy, the inhibiting efficiency of urea decreased rapidly if the test solutions with Cl-.
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