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ATMOSPHERIC CORROSION OF COATED STEEL; RELATIONSHIP BETWEEN LABORATORY AND FIELD TESTING

Cambier, Severine
http://rave.ohiolink.edu/etdc/view?acc_num=osu1388763285

Abstract Details

2014, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
The lifetime prediction for corrosion-protective coatings on metals is a challenge that has been studied for several decades. Accelerated tests are used in the hope to reproduce in few days the damage that would develop during several years of field exposure. Field exposures are also used because accelerated tests are not always reliable. Several approaches have been taken to reduce the duration of field exposures. One of them is the use of sensitive techniques to assess the coating degradation before visual inspection indicates any damage. Cathodic delamination measured by the scanning Kelvin probe (CD-SKP) was introduced here as a sensitive technique to assess the degradation at the coating/metal interface after weathering exposure. This technique was shown to predict the failure of the coating/steel interface. Several climates were tested in the US continent and on the islands of Hawaii. PVB coated steel environmental degradation was characterized in the field and reproduced in the laboratory. A second approach to shorten coated metal field exposure is to accelerate the degradation using intentionally added through-film scribes. In service, most corrosion mechanism for painted metals, such as filiform corrosion and cathodic delamination, initiate from a mechanical defect. The iron oxides formed under PVB and Eponol were identified with Raman spectroscopy to determine the environment factors that participated in their formation. This investigation was complemented by laboratory exposure. An accelerated test for PVB coated steel was designed to reproduce the environmental degradation observed in the field. The CD-SKP technique to assess interface degradation after weathering exposure was also applied to other coating systems. E-coated, sprayed epoxy primers with a conversion coating or grit blasting treatment, and one full coating system were tested.
Gerald Frankel (Advisor)
Rudolph Buchheit (Committee Member)
John Lannutti (Committee Member)
Michael Dunn (Committee Member)
261 p.
Materials Science

Recommended Citations

Citations

  • Cambier, S. (2014). ATMOSPHERIC CORROSION OF COATED STEEL; RELATIONSHIP BETWEEN LABORATORY AND FIELD TESTING [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388763285

    APA Style (7th edition)

  • Cambier, Severine. ATMOSPHERIC CORROSION OF COATED STEEL; RELATIONSHIP BETWEEN LABORATORY AND FIELD TESTING. 2014. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1388763285.

    MLA Style (8th edition)

  • Cambier, Severine. "ATMOSPHERIC CORROSION OF COATED STEEL; RELATIONSHIP BETWEEN LABORATORY AND FIELD TESTING." Doctoral dissertation, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388763285

    Chicago Manual of Style (17th edition)

osu1388763285
1,750
© 2014, some rights reserved.Creative Commons License ATMOSPHERIC CORROSION OF COATED STEEL; RELATIONSHIP BETWEEN LABORATORY AND FIELD TESTING by Severine Cambier is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.