کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1469560 1510035 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dissolution of cerium from cerium-based conversion coatings on Al 7075-T6 in 0.1 M NaCl solutions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Dissolution of cerium from cerium-based conversion coatings on Al 7075-T6 in 0.1 M NaCl solutions
چکیده انگلیسی

Cerium-based conversion coatings (CeCCs) were immersed in 0.1 M NaCl for ∼500 h over a range of pH (2.0–5.7) to investigate the dissolution of cerium species. Dissolution was detected by UV–vis spectroscopy only in the pH 2 solution. Similar cerium concentrations were detected from the dissolution of as-deposited and phosphate post-treated CeCCs. Solubility diagrams for Ce(OH)3, Ce(OH)4, CeO2, and CePO4 showed that only Ce(OH)3 was soluble in acidic conditions. Although pKsp(CePO4) ≈ pKsp(Ce(OH)3), the dissolution of the post-treated CeCCs was slightly higher than the as-deposited CeCCs. Thus, corrosion protection of CeCCs is not provided solely by dissolution of cerium species.


► Dissolution of cerium from cerium-based conversion coatings (CeCCs) on Al 7075-T6.
► Immersion of CeCCs in 0.1 M NaCl showed dissolution only possible at pH ⩽ 2.
► Corrosion protection of CeCCs is not provided by dissolution of cerium species.
► CeCCs corrosion protection mechanism differ from chromate-based conversion coatings.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 60, July 2012, Pages 290–295
نویسندگان
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