EIS study of effective capacitance and water uptake behaviors of silicone-epoxy hybrid coatings on mild steel
作者： X Yuan , ZF Yue , X Chen , SF Wen , L Li
DOI: 10.1016/J.PORGCOAT.2015.04.004
关键词:
摘要: Abstract Electrochemical impedance spectroscopy (EIS) of bare type A3 mild steel and silicone-epoxy hybrid coatings/mild system in 5 wt.% NaCl solution has been investigated, respectively. The analyses models water uptake behaviors coatings have studied during the aging process coatings. Taking into account diffusion oxygen, corrosion products as well formation passive film, six distinguishing were used to fit EIS spectra on steel. was estimated from Brasher–Kingsbury relation using CPE two effective capacitances ( C e f c t B H ) which also calculate coating thicknesses. A comparison between thicknesses calculated capacitance thickness gauge measurements suggested a surface distribution time constant use allows estimating “true” values
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