Zinc-Rich Paint As Anode for Cathodic Protection of Steel in Concrete
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 11
Abstract
This paper describes the findings of the experimental works undertaken to investigate the performance of zinc-rich paint (ZRP) to provide cathodic protection to chloride-contaminated RC structures. The program of experimental works was designed and conducted to assess four principal properties, viz (1) conductivity, (2) adhesion with concrete (short term and long term), (3) durability, and (4) electrochemical polarization. These properties considered together define the ability and effectiveness of the materials to act as an anode for impressed current cathodic protection. The research findings indicated that a specific proprietary ZRP product showed that optimum conductance was obtained with three coats producing a 280–320 μm thickness, with good adhesion to the concrete substrate, in which values obtained ranged between 1.65 and 3.5 MPa with and without applied current. It was capable of withstanding/supporting high levels of current, i.e., more than , and the service life of the ZRP coating was estimated to be well in excess of 20 years at an applied current density of .
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Acknowledgments
The authors wish to express their gratitude and sincere appreciation to the laboratory staff of Coventry University.
References
Abreu, C. M., Espada, L., Izquierdo, M., Merino, P., and Novoa, X. R. (1997). “Zinc rich powder coatings in sea water.” Eurocorr’96, L. Fedrizzi and P. L. Bonora, eds., Vol. 20, Acropolis, Nice, France, 23.
Abreu, C. M., Izquierdo, M., Keddam, M., Novoa, X. R., and Takenouti, H. (1996). “Electrochemical behaviour of zinc- rich epoxy paints in 3% NaCl solution.” Electrochim. Acta, 41(15), 2405–2415.
Amo, B. D., and Giùdice, C. A. (1990). “Influence of some variables on behaviour of zinc-rich paints based on ethyl silicate and epoxy binders.” Proc., 6th Int. Corrosion Congress, Associazione Italiana di Metallurgia, Florence, Italy, 347.
Apostolos, J. A. (1984). “Cathodic protection of reinforced concrete by using metallized coatings and conductive paints.”, Transportation Research Board, Washington, DC, 222–228.
Armas, R. A., Gervasi, C. A., Sarli, A. D., Real, S. G., and Vilche, J. R. (1992). “Zinc-rich paints on steel in artificial seawater by electrochemical impedance spectroscopy.” Corrosion, 48(5), 379–383.
British Standards Institution. (2000). “Concrete—Part 1: Specification, performance, production and conformity.”, London.
British Standards Institution. (2012). “Cathodic protection of steel in concrete.”, London.
Bullard, S. J., Cramer, S., Covino, B. (2009). “Effectiveness of cathodic protection.”, National Energy Technology Laboratory, Albany, OR.
Chess, P.M., and Broomfield, J. P. (2003). Cathodic protection of steel in concrete, CRC Press.
CIRIA. (1993). “Standard test for repair materials and coatings for concrete. Part 1: Pull-off tests.” CIRIA technical note 139, London.
Covino, B. S., Jr., Cramer, S. D., Bullard, S. J., Holcomb, G. R., Russel, J. H., and Collins, W. K. (2002). “Performance of zinc anodes for cathodic protection of reinforced concrete bridges.”, Oregon Dept. of Transportation Research Group, FHWA, Washington, DC.
Das, S. C. (2012). “Zinc rich paint as anode system for cathodic protection (cp) of reinforced concrete structures and development of corrosion/cp monitoring probes.” Ph.D. thesis, Coventry Univ., Coventry, U.K.
Elcometer. (2004). Elcometer 106 scale 6: Coatings on concrete adhesion tester and concrete tensile tester: Operating instructions, Belgium.
Feliu, S., Barajas, R., Bastidas, J. M., and Morcillo, M. (1989). “Mechanism of cathodic protection of zinc-rich paints by electrochemical impedance spectroscopy.” J. Coating Technol., 61(775), 63–69.
Fragata, F. L., Sebrão, M., and Serra, E. T. (1987). “The influence of particle size and metallic zinc content in the behaviour of zinc-rich paints.” J. Coatings Technol., 60(751), 12–16.
Hare, C. H. (1998). “Mechanisms of corrosion protection with surface treated wollastonite pigments.” J. Protective Coatings, 14(3), 47–82.
Kepler, J. L., Darin, D., and Lock, C. E. (2000). “Evaluation of corrosion protection methods for reinforced concrete highway structures.”, Univ. of Kansas Center for Research, Lawrence, KS.
Lindquist, S. A., Méssaros, L., and Svenson, L. (1985). “Aspects of galvanic action of zinc-rich paints. Electrochemical investigation of eight commercial primers.” Oil Colour Chem. Assoc., 68, 10.
Morcillo, M., Barajas, R., Feliu, S., and Bastidas, J. M. (1990). “Electrochemical behavior of zinc-rich coatings.” J. Mater. Sci., 25(5), 2441–2446.
NACE (National Association of Corrosion Engineers). (2007). NACE TM0294 test method, accelerated life testing of zinc anode for steel reinforced concrete, Houston.
National Cooperative Highway Research Program (NCHRP). (2009). “Synthesis 398, Cathodic protection for life extesion of existing reinforced concrete bridge elements.”, Transportation Research Board, Washington, DC.
Pereira, D., Scantlebury, J. D., Ferreira, M. G. S., and Almeida, M. C. (1990). “The application of electrochemical measurements to the study and behaviour of zinc–rich coatings.” Corros. Sci., 30(11), 1135–1147.
Sagüés, A. A., and Powers, R. G. (1996). “Sprayed-zinc sacrificial anodes for reinforced concrete in marine service.” Corrosion, 52, 508.
Strategic Highways Research Program. (1993). “Cathodic protection of reinforced concrete bridge elements: A state-of the-art report.”, Eltech Research Corporation, National Research Council, Washington, DC.
Vilche, J. R., Bucharsky, E. C., and Giúdice, C. A. (2002). “Application of EIS and SEM to evaluate the influence of pigment shape and content in ZRP formulations on the corrosion prevention of naval steel.” Corros. Sci., 44(6), 1287–1309.
Wicks, Z. W., Jr., Jones, F. N., and Pappas, S. P. (1994). Organic coatings: Science and technology, 2nd Ed., Wiley, New York.
Zhang, X. G. (1996). Corrosion and electrochemistry of zinc, Plenum, New York.
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© 2015 American Society of Civil Engineers.
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Received: Mar 31, 2014
Accepted: Nov 12, 2014
Published online: Feb 18, 2015
Discussion open until: Jul 18, 2015
Published in print: Nov 1, 2015
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