Date of Graduation

Spring 2017

Document Type

Honors Research Project

Degree Name

Bachelor of Science

Major

Corrosion Engineering

Research Sponsor

Dr. Rajeev Gupta

First Reader

Dr. Hongbo Cong

Second Reader

Dr. Quixin Zhou

Abstract

The objective of this work was to study the influence of light (wave length ~ 460 nm) on the electrochemical characteristics of pure aluminum. The open circuit potential (OCP) measurements, potentiostatic polarization, cyclic potentiodynamic polarization and Zero Resistance Ammetry (ZRA) were performed in 0.1 M NaCl solution. It was observed that the incident light shifted the OCP in the noble direction by 100 mV. Furthermore, ZRA was performed to measure the galvanic current between illuminated and non-illuminated aluminum electrodes. Cyclic potentiodynamic polarization tests revealed the influence of light on the pitting potential, passive current density, corrosion current density, and repassivation potential. This study indicated that the incident light modified electronic properties of the passive film, which influenced the corrosion behavior. Future research using Mott-Schottky analysis will develop further insight into the influence of light on the electronic properties of the passive film.

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