Development of a novel atmospheric chloride detector

Development of a novel atmospheric chloride detector

Presenter(s)

Hannah Buchanan

Comments

9:00-9:20, Kennedy Union 207

Description

Silver is often used as an indicator in atmospheric corrosion studies to better understand the effect of environmental chemistry on corrosion severity. A common experimental method involves the exposure of silver coupons at environments of interest, allowing corrosion products to form, followed by coulometric reduction analysis. However, this type of analysis makes a key and often overlooked assumption: that the composition of the corrosion film does not change after initial formation. This assumption of chemical stability of the corrosion product has not been extensively studied and does not account for possible chemical changes within the corrosion products due to ongoing environmental exposure or storage conditions.In the first phase of the study, coulometric reduction and X-ray photoelectron spectroscopy (XPS) were used to study multi-component lab-grown silver corrosion product films, which reveled differences in the corrosion product films based on component deposition order. This was inferred to be due to a substitution reaction within the corrosion product film which occurred during exposure to other electrolytes during the deposition of the subsequent films.In the second phase, salt spray was used to demonstrate that the amount of substitution reaction that occurs from Ag2O to AgCl is proportional to the extent of exposure to NaCl. Ag2O films were electrochemically grown and exposed to salt spray under varied conditions. This demonstrates the applicability of silver oxide films for the quantitative detection of atmospheric chloride deposition in a new way.

Publication Date

4-23-2025

Project Designation

Independent Research

Primary Advisor

Douglas C. Hansen, Ron A. Zeszut

Primary Advisor's Department

Chemical and Materials Engineering

Keywords

Stander Symposium, School of Engineering

Institutional Learning Goals

Scholarship

Development of a novel atmospheric chloride detector

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