期刊
CORROSION SCIENCE
卷 48, 期 10, 页码 3298-3308出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2005.10.020
关键词
zinc; rare earth elements; hexadecanoate ion; self-assembled monolayer; polarization
A self-assembled monolayer (SAM) of hexadecanoate ion C15H31CO2 (C(16)A-) was prepared on a zinc electrode covered with a layer of hydrated cerium(Ill) oxide Ce2O3. The protection of zinc against corrosion was examined for the electrode coated with the Ce2O3 layer and the C(16)A-SAM in an oxygenated 0.5 M NaCl solution. A more positive open-circuit potential of the coated electrode was maintained during immersion in the solution for 4 h than that of the uncoated one and polarization curves showed marked suppression of the anodic process, implying that the layer modified with the SAM acted as a passive film. The protective efficiency of the modified layer was extremely high, more than 99%. The zinc surface coated with the Ce2O3 layer and the C(16)ASAM was characterized by X-ray photoelectron and FTIR reflection spectroscopies and contact angle measurement with a drop of water. (c) 2006 Elsevier Ltd. All rights reserved.
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