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Corrosion Protection from Inhibitors and Inhibitor Combinations Delivered by Synthetic Ion Exchange Compound Pigments in Organic Coatings  

Chrisanti, S. (Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University)
Ralston, K.A. (Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University)
Buchheit, R.G. (Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University)
Publication Information
Corrosion Science and Technology / v.7, no.4, 2008 , pp. 212-218 More about this Journal
Abstract
Inorganic ion exchange compounds (IECs) including hydrotalcites and bentonite clays are a well known classes of layered mixed metal hydroxides or silicates that demonstrate ion exchange properties. These compounds have a range of applications from water purification to catalyst supports. The use of synthetic versions of these compounds as environmentally friendly additives to paints for storage and release of inhibitors is a new and emerging application. In this paper, the general concept of storage and release of inhibiting ions from IEC-based particulate pigments added to organic coatings is presented. The unique aspects of the IEC structure and the ion exchange phenomenon that form the basis of the storage and release characteristic are illustrated in two examples comprising an anion exchanging hydrotalcite compound and a cation exchanging bentonite compound. Examples of the levels of corrosion protection imparted by use of these types of pigments in organic coatings applied to aluminum alloy substrates is shown. How corrosion inhibition translates to corrosion protection during accelerated exposure testing by organic coatings containing these compounds is also presented.
Keywords
coatings; ion exchange compounds; inhibitors; electrochemical impedance spectroscopy;
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  • Reference
1 H. F. W. Taylor, Min. Mag., 39, 377 (1973)   DOI
2 K. Itaya and H. C. Chang, Inorg. Chem., 26, 624 (1987)   DOI
3 I. Sissoko, E. T. Iyagba, R. Sahai, and P. Biloen, J. of Solid State Chem., 60, 283 (1985)   DOI   ScienceOn
4 S. Chrisanti and R. G. Buchheit, work in progress (2007)
5 Anon., Chemical Week, 161, 27 (1999)
6 S. P. V. Mahajanam, Application of hydrotalcites as corrosion inhibiting pigments in organic coatings, The Ohio State University (2005)
7 W. T. Reichle, J. Catal., 94, 547 (1985)   DOI   ScienceOn
8 E. T. Iyagba, A Study of the Crystal Structure of Hydrotalcites and Their Catalytic Properties, University of Pittsburgh (1986)
9 F. Kooli and W. Jones, Inorg. Chem., 34, 6237 (1995)   DOI
10 C. F. Baes and R. E. Mesmer, The Hydrolysis of Cations, p. 138, Robert E. Krieger Pub. Co., 1986
11 J. K. G. Panitz and D. J. Sharp, The Use of Hydrotalcite as a Chloride-Ion Getter for a Barrier Aluminum Anodization Process, SAND95-2300, Sandia National Laboratories, Albuquerque (1995)
12 S. Miyata, Clay and Clay Minerals, 31, 305 (1983)   DOI
13 Standard Practice for Modfied Salt Spray (Fog) Testing, in Annual Book of ASTM Standards, Section 3, Wear Erosion; Metal Corrosion, E. R. F. Allen, Editor. 1999, ASTM: West Conshohocken, PA. p. 367
14 S. Miyata, Clay and Clay Minerals, 28, 50 (1980)   DOI
15 R. E. Grim, Clay Mineralogy, 2nd ed., p. 78, McGraw-Hill (1968)
16 D. Dermats and M. S. Dadachov, Applied. Clay Science, 23, 245 (2003)   DOI   ScienceOn
17 S. Miyata, Clay and Clay Miner., 23, 369 (1975)   DOI   ScienceOn
18 S. K. Kawatra and S. J. Ripke, Materials Engineering, 14, 647 (2001)
19 K. R. Poppelmeier and S. J. Hwu, Inorg. Chem., 26, 3297 (1987)   DOI
20 Anon., Chemical and Engineering News, 77, 12 (1999)
21 M. A. Drezdzon, Inorg. Chem., 27, 4628 (1988)   DOI