© 2006 by Taylor & Francis Group, LLC

More documents

Recommendations

Info

126 Corrosion Control Through Organic Coatings 7.3.3 STRESSING THE ACHILLES’ HEEL Every coating has its own Achilles’ heel — that is, a point of weakness. The ideal test would accelerate all stresses to the same extent. It would then be possible to compare coatings with different aging mechanisms — different Achilles’ heels — to each other. Unfortunately, it is not possible to accentuate all stresses evenly. Furthermore, it is not possible to accentuate all weathering factors and still maintain the balance between them that exists in the field. When we increase the percentage of time with UV load, for example, we change the ratio of light and dark and move a step away from the real diurnal cycle seen in the field. Because it is not possible to evenly accelerate all aging factors, the best testing tries to imitate an expected failure mechanism. Each test accentuates one or a few stresses that are rate-controlling for a mechanism. By choosing the right test, it is possible to thus probe for certain expected weaknesses in the coating/substrate system. The trick, of course, is to correctly estimate the failure mechanism for a particular application, and thus pick the most suitable test. REFERENCES 1. Ström, M. and Ström, G., SAE Technical Paper Series, 932338, Society of Automotive Engineers, Warrendale, PA, 1993. 2. Forsgren, A. and Appelgren, C., Performance of organic coatings at various field stations after 5 years’ exposure, SCI Rapport 2001:5E, Swedish Corrosion Institute, Stockholm, 2001. 3. Appelman, B., J. Coat. Technol., 62, 57, 1990. 4. Huldén, M. and Hansen, C.M. Prog. Org. Coat., 13, 171, 1985. 5. Kumins, C.A. et al., Prog. Org. Coat., 28, 17, 1996. 6. Ito, Y., Hayashi, K. and Miyoshi, Y., Iron Steel J., 77, 280, 1991. 7. Stratmann, M., Bohnenkamp, K. and Ramchandran, T., Corros. Sci., 27, 905, 1987. 8. Miyoshi, Y. et al., SAE Technical Paper Series, 820334, Society of Automotive Engineers, Warrendale, PA, 1982. 9. Nakgawa, T., Hakuri, H. and Sato, H., Mater. Process, 1, 1653, 1988. 10. Brady, R. et al., SAE Technical Paper Series, 892567, Society of Automotive Engineers, Warrendale, PA, 1989. 11. Mansfield, F., Atmospheric corrosion, in Encyclopedia of Materials Science and Engineering, Vol. 1, Pergamon Press, Oxford, 1986, 233. 12. Boelen, B. et al., Corros. Sci., 34, 1923, 1993. 13. Suga, S., Prod. Finish., 40, 26, 1987. 14. Boocock, S.K., JPCL, 11, 64, 1994. 15. Seré, P.R. et al., J. Scanning Microsc., 19, 244, 1997. 16. Odnevall, I. and Leygraf, C., Atmospheric corrosion, in ASTM STP 1239, Kirk, W.W. and Lawson, H.H., Eds., American Society for Testing and Materials, Philadelphia, 1994, 215. 17. Almeida, E.M., Pereira, D. and Ferreira, M.G.S., An electrochemical and exposure study of zinc rich coatings, in Proc. Advances in Corrosion Protection by Organic Coatings, Scantlebury, D. and Kendig, M., Eds., The Electrochemical Society Inc., Pennington, 1989, 486. © 2006 by Taylor & Francis Group, LLC
Corrosion Testing — Background and Theoretical Considerations 127 18. Lambert, M.R. et al., Ind. Eng. Chem. Prod. Res. Dev., 24, 378, 1985. 19. Jordan, D.L., Galvanic interactions between corrosion products and their bare metal precursors: A contribution to the theory of underfilm corrosion, in Proc. Advances in Corrosion Protection by Organic Coatings, Scantlebury, D. and Kendig, M., Eds., The Electrochemical Society Inc., Pennington, 1989, 30. 20. Jordan, D.L., Influence of iron corrosion products on the underfilm corrosion of painted steel and galvanized steel, in Zinc-Based Steel Coating Systems: Metallurgy and Performance, Krauss, G. and Matlock, D.K., Eds., The Minerals, Metals, & Materials Society, Warrendale, PA, 1990, 195. 21. Jordan, D.L, Franks, L.L. and Kallend, J.S., Measurement of underfilm corrosion propagation by use of spotface paint damage, in Proc. Corrosion ’95, NACE, Houston, 1995, Paper 384. 22. Lindqvist, S.A., Corrosion, 41, 69, 1985. 23. Boocock, S.K., Some results from new accelerated testing of coatings, in Proc. Corrosion ’92, NACE, Houston, 1992, Paper 468. 24. Smith, A.G., Polym. Mater. Sci. Eng., 58, 417, 1988. 25. Mallon, K. et al., Accelerated test program utilizing a cyclical test method and analysis of methods to correlate with field testing, in Proc. Corrosion ’92, NACE, Houston, 1992, Paper 331. 26. Townsend, H., Development of an improved laboratory corrosion test by the automotive and steel industries, in Proc. of the 4th Annual ESD Advanced Coatings Conference, Engineering Society of Detroit, Detroit, MI, 1994. 27. Yau, Y.-H., Hinnerschietz, S.J. and Fountoulakis, S.G., Performance of organic/metallic composite coated sheet steels in accelerated cyclic corrosion tests, in Proc. Corrosion ’95, NACE, Houston, 1995, Paper 396. 28. Hare, C.H., J. Prot. Coat. Linings, 14, 67, 1997. 29. Koleske, J.V., Paint and Coating Manual: 14th Edition of the Gardner-Sward Handbook. ASTM, Philadelphia, 1995. 30. Surface Coatings: Science & Technology. 2nd ed., Paul, S., Ed., John Wiley & Sons, Chichester, 1996. 31. Rendahl, B. and Forsgren, A., Field Testing of Anticorrosion Paints at Sulphate and Sulphite Mills, Report 1997:6E, Swedish Corrosion Institute, Stockholm, 1998. 32. Glueckert, A.J., Correlation of accelerated test to outdoor exposure for railcar exterior coatings, in Proc. Corros. 94, NACE, Houston, 1994, Paper 596. © 2006 by Taylor & Francis Group, LLC
Page 1 and 2:
© 2006 by Taylor & Francis Group,
Page 3 and 4:
Corrosion of Ceramic and Composite
Page 5 and 6:
Published in 2006 by CRC Press Tayl
Page 7 and 8:
Preface This book has been written
Page 9 and 10:
Author Amy Forsgren received her ch
Page 11 and 12:
Contents Chapter 1 Introduction ...
Page 13 and 14:
2.4.2 Reactive Reagents ...........
Page 15 and 16:
6.2.4.1 Alkaline Blistering........
Page 17 and 18:
1 Introduction This book is not abo
Page 19 and 20:
Introduction 3 • A dissolution pr
Page 21 and 22:
Introduction 5 1.2.2 ELECTROLYTIC R
Page 23 and 24:
Introduction 7 to the metal is a ne
Page 25 and 26:
Introduction 9 9. Thomas. N.L., Pro
Page 27 and 28:
12 Corrosion Control Through Organi
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
4 Blast Cleaning and Other Heavy Su
Page 83 and 84:
Blast Cleaning and Other Heavy Surf
Page 85 and 86:
Page 87 and 88:
Page 89 and 90: Blast Cleaning and Other Heavy Surf
Page 99 and 100: 5 Abrasive Blasting and Heavy-Metal
Page 101 and 102: Abrasive Blasting and Heavy-Metal C
Page 113 and 114: 6 Weathering and Aging of Paint Thi
Page 115 and 116: Weathering and Aging of Paint 101 c
Page 117 and 118: Weathering and Aging of Paint 103 I
Page 119 and 120: Weathering and Aging of Paint 105 c
Page 121 and 122: Weathering and Aging of Paint 107 S
Page 123 and 124: Weathering and Aging of Paint 109 e
Page 125 and 126: Weathering and Aging of Paint 111 I
Page 127 and 128: 7 Corrosion Testing — Background
Page 129 and 130: Corrosion Testing — Background an
Page 139: Corrosion Testing — Background an
Page 143 and 144: 130 Corrosion Control Through Organ
Page 167: 154 Corrosion Control Through Organ
show all

© 2006 by Taylor & Francis Group, LLC

Create successful ePaper yourself

Delete template?

Save as template?