کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5367699 1388370 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface study of cerium oxide based coatings obtained by cathodic electrodeposition on zinc
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Surface study of cerium oxide based coatings obtained by cathodic electrodeposition on zinc
چکیده انگلیسی

A surface study of electrodeposited cerium oxide based coatings is presented. Different surface analytical techniques were used in order to obtain complementary information to fully characterize such complex systems. X-ray Photoelectron Spectroscopy was used as the main technique to determine the surface composition of the coating. The analysis of the core level peaks of the elements provides additional information about the functional groups present on the surface. A mixture of Ce (III) and Ce (IV) was found in the coating and their proportion was calculated at different depths. The analysis of the O 1s core level peak revealed a triple structure whose origin will be discussed. To support the results obtained, electron stimulated desorption was performed. The study was completed with Auger electron spectroscopy and Raman spectroscopy, both techniques having different surface sensitivities. From all these results, it is derived that incomplete electrochemical reactions occurred during the growth of the coatings. This led to rather complex compositions, in which defective cerium oxides are the major species. In addition, hydroxides, carbonates and nitrates are also present, together with adsorbed water.

Research highlights► Ce oxide based coatings composition. ► Ce (III) and Ce (IV) oxides with hydroxides, carbonates, nitrates and water. ► Upon sputtering and XPS less reactive and more hydrophobic surface. ► H+ is the only detected ion desorbed from Ce-O-H and Ce-H species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 257, Issue 14, 1 May 2011, Pages 6202-6207
نویسندگان
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