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Electrochemical impedance spectroscopy investigations of epoxy zinc rich coatings: Role of Zn content on corrosion protection mechanism

DSpace at IIT Bombay

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Title Electrochemical impedance spectroscopy investigations of epoxy zinc rich coatings: Role of Zn content on corrosion protection mechanism
 
Creator SHREEPATHI, S
BAJAJ, P
MALLIK, BP
 
Subject powder coatings
water
eis
behavior
zinc rich primers
galvanic protection
barrier protection
organic zinc rich coatings
electrochemical impedance spectroscopy
 
Description Effect of zinc content in the epoxy zinc rich coating on the mechanism of corrosion protection was investigated using electrochemical impedance spectroscopy (EIS). The zinc content in the coating (on dry film) was varied from 40% to 90% in steps of 10%. Open circuit potential (OCP) measurements and salt spray tests were also carried out to generate supporting evidences and to deepen the understanding in the area of zinc rich coatings. The healing or bridging ability of these coatings was studied by making a scribe on the coating and monitoring the evolution of OCP. EIS was also utilized to screen the amount of zinc particles required to provide efficient galvanic protection and to study the effect of purity of Zn on corrosion protection performance. Both EIS and OCP measurements indicate that coatings containing 40% Zn (on dry film) provides very good barrier protection coming mainly from polymer whereas the one containing >80% Zn provides excellent galvanic protection to the steel substrate. When the zinc loading is between 60% and 70%, coatings neither show barrier protection nor galvanic protection.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-24T06:04:54Z
2011-12-26T12:56:46Z
2011-12-27T05:45:58Z
2011-08-24T06:04:54Z
2011-12-26T12:56:46Z
2011-12-27T05:45:58Z
2010
 
Type Article
 
Identifier ELECTROCHIMICA ACTA, 55(18), 5129-5134
0013-4686
http://dx.doi.org/10.1016/j.electacta.2010.04.018
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10783
http://hdl.handle.net/10054/10783
 
Language en