Early Detection of Corrosion via Hydrogel-based Spectroelectrochemical Sensors

Author

Capri Ann Price, Portland State UniversityFollow

Sponsor

Portland State University. Department of Chemistry

First Advisor

Tami L. Clare

Date of Publication

Fall 11-16-2018

Document Type

Dissertation

Degree Name

Doctor of Philosophy (Ph.D.) in Chemistry

Department

Chemistry

Language

English

Subjects

Colloids, Corrosion and anti-corrosives

DOI

10.15760/etd.6521

Physical Description

1 online resource (xii, 69 pages)

Abstract

The backbone of the industrialized world is comprised of refined, zerovalent metal, a material which thermodynamically favors an oxidative return to more chemically stable states. There are many methods used to slow or delay this process, such as protective coatings, sacrificial anodes, and alloys, but no method can entirely prevent corrosion. This body of work instead proposes detecting the earliest chemical markers of corrosion: that is, metal ions as they solubilize from a metal surface. Such information would allow maintenance personnel to make informed decisions about the necessity or lack thereof of preventive maintenance, and intervene before advanced damage has a chance to occur.

This dissertation finds that hydrogel-based sensors are capable of such detection and offer a multisensory response, with colorimetric, electrical, volumetric and vibrational changes. Both the colorimetric and electrical trends were calibrated and used for quantification of metal ions both in solution and directly from metal substrate surfaces. Observing how the hydrogels responded to various metal ions contributed to a greater understanding of how ion-headgroup associations can affect the sensory responses of a hydrogel, something that can be exploited in future sensor work. The ability of the sensors to detect ions directly from metal surfaces allowed for an investigation of the protective quality of fatty acids as corrosion inhibitors. A range of chain lengths were tested using the hydrogels, and the comparison to current characterization techniques showed good correlation. This accessible technique, beyond contributing to the current meager literature of fatty acids as corrosion inhibitors, can also allow for the determination of acceptable benchmarks of corrosion, information that is sorely needed to efficiently steward global infrastructure.

Rights

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Comments

Supplementary video files are located below in the Additional Files

Persistent Identifier

https://archives.pdx.edu/ds/psu/26759

Recommended Citation

Price, Capri Ann, "Early Detection of Corrosion via Hydrogel-based Spectroelectrochemical Sensors" (2018). Dissertations and Theses. Paper 4637.
https://doi.org/10.15760/etd.6521