کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1471447 990350 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of underpotential deposition of lead on polarization behavior of nickel in acidic perchlorate solutions at room temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Effect of underpotential deposition of lead on polarization behavior of nickel in acidic perchlorate solutions at room temperature
چکیده انگلیسی
The effect of Pb2+ on polarization behavior of nickel has been investigated in 0.1 M NaClO4 + 10−2 M HClO4 + x M PbO solutions (x = 0, 10−5, 10−4, 10−3) at room temperature. The cyclic voltammogram has suggested that Pb2+ degrades the stability of the passive film on Ni. The corrosion potential of Ni shifted to the more noble direction and the anodic current peak of Ni dissolution decreased with increasing Pb2+ concentration in solution, indicating that Pb2+ suppresses significantly the anodic dissolution. The underpotential deposition (UPD) of lead on Ni in the potential range more noble than −0.215 V (SHE) corresponding to the equilibrium potential of the Pb2+ (10−3 M)/Pb electrode was confirmed by XPS and GDOES analyses. The anodic Tafel slope, b+, of Ni dissolution changed from b+ = 40 mV decade−1 in the absence of Pb2+ to b+ = 17 mV decade−1 in the presence of 10−4 or 10−3 M Pb2+, which was ascribed to the increase in active sites of Ni surface emerged as a result of electrodesorption of Pb adatoms. The roles of Pb adatoms in active dissolution and active/passive transition of Ni were discussed from the above results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 50, Issue 11, November 2008, Pages 3139-3146
نویسندگان
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