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| Corrosion Inhibition and Adsorption Mechanism of Dodecylamine for Copper-Nickel Alloy in NaCl Solutions |
| June Qv;Xingpeng Guo |
| 华中科技大学化学系应用化学系 |
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Abstract The corrosion inhibition behavior and adsorption mechanism of dodecylamine for a copper-nickel alloy in 0.2 mol/L NaCl solutions was studied by electrochemical methods and atomic force microscopy (AFM).The results showed that dodecylamine had both cathodic and anodic inhibition action,but the cathodic effect was dominant.The adsorption behaviour of dodecylamine obeyed Flory-Huggins isotherm model.The adsorbed dodecylamine film changed the structure of the double-electric layer and made the potential of zero charge (PZC) shift to the positive direction.It can be concluded from the AFM phase images that as the inhibitor concentration increased,the adsorbed film of inhibitor tended to become more density and orderly so that corrosion inhibition efficiency increased.AFM force curve
measurements were also performed and showed that as a result of the adsorption of dodecylamine on copper-nickel alloy surface,adhesive forces between the tip and the sample surface were detected and the long-range electrostatic repulsive forces between the tip and the sample surface were decreased.
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Received: 27 October 2004
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