کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5364285 1388314 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of hydrazine and hydroxylaminophosphate on chrome plating from trivalent electrolytes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Effect of hydrazine and hydroxylaminophosphate on chrome plating from trivalent electrolytes
چکیده انگلیسی
The influence of hydrazine and hydroxylaminophosphate on solution chemistry and quality of chromium coatings deposited from Cr(III) formate-urea baths has been studied by FT-IR, XPS and AFM. The results have shown that hydrazine and hydroxylaminophosphate differently affect Cr plating. The morphology of Cr deposits obtained in the formate-urea electrolytes is a typical nodular structure with a less nodular and smoother fine-grained structure of Cr obtained in the presence of hydroxylaminophosphate. Hydrazine, in contrast, worsened the quality and lowered the hardness of the deposits. The current efficiency of chromium increases in the presence of both hydrazine and hydroxylaminophosphate. This may be related with the ability of these ligands to reduce the CrH content in the growing Cr deposit. The data obtained suggest that hydroxylaminophosphate improves the stability of the active [Cr(carbamide)n(H2O)6−n]3 complexes providing good quality of the deposits and prolonged working lifetime in the formate-urea bath.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 253, Issue 16, 15 June 2007, Pages 6738-6743
نویسندگان
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