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PhD Dissertation BCRT.pdf (4.09 MB)

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Blister Test for Measurements of Adhesion and Adhesion Degradation of Organic Polymers on AA2024-T3

Rincon Troconis, Brendy Carolina
http://rave.ohiolink.edu/etdc/view?acc_num=osu1366072959

Abstract Details

2013, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
A key parameter for the performance of corrosion protective coatings applied to metals is adhesion. Surface preparation prior to coating application is known to be critical, but there is a lack of understanding of what controls adhesion. Numerous techniques have been developed in the last decades to measure the adhesion strength of coatings to metals. Nonetheless, they are generally non-quantitative, non-reproducible, performed in dry conditions, or overestimate adhesion. In this study, a quantitative and reproducible technique, the Blister Test (BT), is used. The BT offers the ability to study the effects of a range of parameters, including the presence or absence of a wetting liquid, and simulates the stress situation in the coating/substrate interface. The effects of roughness and surface topography were studied by the BT and Optical Profilometry, using AA2024-T3 substrates coated with polyvinyl butyral (PVB). Random abrasion generated a surface with lower average roughness than aligned abrasion due to the continual cross abrasion of the grooves. The BT could discern the effects of different mechanical treatments. An adhesion strength indicator was defined and found to be a useful parameter. The effectiveness of standard adhesion techniques such as ASTM D4541 (Pull-off Test) and ASTM D3359 (Tape Test) was compared to the BT. Also, different attempts to measure adhesion and adhesion degradation of organic polymers to AA2024-T3 were tested. The pull-off test does not produce adhesive failure across the entire interface, while the tape test is a very qualitative technique and does not discern between the effects of different coating systems on the adhesion performance. The BT produces adhesive failure of the primer studied, is very reproducible, and is able to rank different coating systems. Therefore, it was found to be superior to the others. The approaches tested for adhesion degradation were not aggressive enough to have a measurable effect. The effects of cleaning/desmutting and conversion coating (CC) on the adhesion strength of acetoacetate to AA2024-T3 and the effects of improper water rinse temperature after cleaner were assessed using the BT. The results showed that pretreatments improve the adhesion strength of acetoacetate primer on AA2024-T3, but the comparative behavior depends on the specific treatment. Process control is of paramount importance for the performance of acetoacetate coated systems applied on AA2024-T3. The lack of thermal activity in the water rinse after cleaning step produces deleterious effects on the adhesion and blistering resistance of CC. Finally, a test sample incorporating a coated and scribed Al alloy panel and uncoated through-hole fasteners (Ti, SS316, AA2024-T3) was designed to provide accelerated response during atmospheric corrosion testing in the field (long-term beach exposure) or in laboratory chambers (ASTM B117). The results after only three weeks of exposure to ASTM B117 correlated well with long-term beach exposure, allowing rapid ranking of different coating systems. Of the fastener materials studied, visual observation and volume lost determination indicated that the worst attack occurred near SS316 fasteners its effect was explained by Scanning Kelvin Probe measurements and the available cathodic current measured in chloride solution.
Gerald Frankel (Advisor)
Buchheit Rudolph (Committee Member)
Heather Powell (Committee Member)
247 p.
Materials Science
AA2024-T3; corrosion; coating; adhesion; blister test; acetoacetate; polyvinyl butyral; cleaning; desmutting; conversion coating; roughness; water rinse; accelerated test; galvanic panels.

Recommended Citations

Citations

  • Rincon Troconis, B. C. (2013). Blister Test for Measurements of Adhesion and Adhesion Degradation of Organic Polymers on AA2024-T3 [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366072959

    APA Style (7th edition)

  • Rincon Troconis, Brendy. Blister Test for Measurements of Adhesion and Adhesion Degradation of Organic Polymers on AA2024-T3. 2013. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1366072959.

    MLA Style (8th edition)

  • Rincon Troconis, Brendy. "Blister Test for Measurements of Adhesion and Adhesion Degradation of Organic Polymers on AA2024-T3." Doctoral dissertation, Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366072959

    Chicago Manual of Style (17th edition)

osu1366072959
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This open access ETD is published by The Ohio State University and OhioLINK.