Journal
APPLIED SURFACE SCIENCE
Volume 253, Issue 5, Pages 2875-2884Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2006.06.030
Keywords
phosphate conversion coatings; electrochemical impedance spectroscopy; porosity; linear polarization
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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.
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