کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1470455 990326 2009 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Correlation between electrochemical impedance and noise measurements of waterborne coatings
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Correlation between electrochemical impedance and noise measurements of waterborne coatings
چکیده انگلیسی

A modified equivalent electric circuit is proposed to establish correspondence between impedance and noise measurements in waterborne coatings in saline media (NaCl). The polarization resistance (Rp) given by the impedance modulus when frequency approaches to zero can not directly be compared with noise measurements since this latter accounts only for the pore resistance of the paint of low barrier protective coatings while Rp parameter represents the sum of all the resistances at the system. The results have shown that the pore resistance data can be attributed to noise resistance when (i) the coating exhibit porosity presenting diffusion mechanism as rate-determining step, and (ii) when the sampling frequency of recorded data gives a Nyquist frequency of 1 Hz.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 51, Issue 3, March 2009, Pages 499–510
نویسندگان
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