Detecting and estimating the extent of automotive coating delamination and damage indexes after stone chipping using electrochemical impedance spectroscopy

•Coating damage and delamination after aging of electrodeposition layer was obtained.•Stone Chipping resistance of the coating was evaluated by electrochemical studies.•Number and nature of damages were evaluated by electrochemical technique.•New parameters were defined based on Bode results to eval...

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Bibliographic Details
Published in:Progress in organic coatings 2016-03, Vol.92, p.95-109
Main Authors: Alizadeh Razin, A., Ramezanzadeh, B., Yari, H.
Format: Article
Language:English
Subjects:
Automotive coating
Chipping
Chipping test
Coating
Coating damage
Damage
Delaminating
Delamination
EIS
Electrochemical impedance spectroscopy
Mathematical analysis
Stone
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Summary:•Coating damage and delamination after aging of electrodeposition layer was obtained.•Stone Chipping resistance of the coating was evaluated by electrochemical studies.•Number and nature of damages were evaluated by electrochemical technique.•New parameters were defined based on Bode results to evaluate chipping degree. The main objective of this study is to investigate the nature and intensity of the failures produced on an automotive coating system after stone chipping test by an electrochemical impedance spectroscopy (EIS). The extent of coating damage and delamination were calculated based on various data i.e. impedance at low frequency, phase angle at high frequency and areas under Bode modulus plots. There was good correlation between the results of image processing and the parameters extracted from EIS analysis for the estimation of coating damage index and coating delamination extent from the substrate after chipping test.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2015.11.023