Electrochemical impedance spectroscopy and linear polarization applied to evaluation of porosity of phosphate conversion coatings on electrogalvanized steels

被引：87
作者：
de Freitas Cunha Lins, Vanessa
de Andrade Reis, Geraldo Francisco
de Araujo, Carlos Roberto
Matencio, Tulio
机构：
[1] Univ Fed Minas Gerais, Dept Chem Engn, Corros & Surface Engn Lab, BR-30160030 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Dept Chem, BR-31270901 Belo Horizonte, MG, Brazil
来源：
APPLIED SURFACE SCIENCE | 2006年 / 253卷 / 05期
关键词：
phosphate conversion coatings; electrochemical impedance spectroscopy; porosity; linear polarization;
D O I：
10.1016/j.apsusc.2006.06.030
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, electrochemical impedance spectroscopy and linear polarization are used in determining porosity of zinc phosphates, and of nickel and manganese modified zinc phosphates on electrogalvanized steel. The porosity of the phosphate layers ranges from 0.1% for the manganese-modified hopeite to 8% for hopeite, using the linear polarization and the electrochemical impedance spectroscopy techniques. The porosity values measured using the two techniques were in agreement. All impedance spectra of coated samples showed two steps, with two capacitive arcs and an inductive looping. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：2875 / 2884
页数：10
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