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| Corrosion Behavior of AZ91D Magnesium Alloy in Hand Sweat Ⅱ.Inhibiting mechanism of urea on magnesium alloy AZ91D in hand sweat |
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Abstract 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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Received: 14 May 2003
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[4]DeanJA .Lange’sHandbookofChemistry[M ].McGrawHill:1985 |
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