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Article
In Situ Stress Measurement During Aluminum Anodizing Using Phase-Shifting Curvature Interferometry
Journal of the Electrochemical Society
  • Ömer Özgür Çapraz, Iowa State University
  • Kurt R. Hebert, Iowa State University
  • Pranav Shrotriya, Iowa State University
Document Type
Article
Publication Date
1-1-2013
DOI
10.1149/2.025311jes
Abstract

Stress measurements yield insight into technologically relevant deformation and failure mechanisms in electrodeposition, battery reactions, corrosion and anodic oxidation. Aluminum anodizing experiments were performed to demonstrate the effectiveness of phase-shifting curvature interferometry as a new technique for high-resolution in situ stress measurement. This method uses interferometry to monitor surface curvature changes, from which stress evolution is inferred. Phase-shifting of the reflected beams enhanced measurement sensitivity, and the separation of the optical path from the electrochemical cell in the present system provided increased stability. Curvature changes as small as 10−3 km−1 were detected, at least comparable to the resolution of state-of-the-art multiple beam deflectometry. It was demonstrated that small curvature change rates of 10−3 km−1s−1 could be reliably measured, indicating that the technique can be applied to bulk samples. The dependence of the stress change during anodizing on current density (tensile at low current density, but increasingly compressive at higher current densities) was quantitatively consistent with earlier multiple-beam deflectometry measurements. The close similarity between the results of these different high-resolution measurements helps to resolve conflicting reports of anodizing-induced stress changes found in the literature.

Comments

This article is from Journal of the Electrochemical Society 160 (2013): D501–D506, doi:10.1149/2.025311jes. Posted with permission.

Copyright Owner
ECS—The Electrochemical Society
Language
en
Date Available
2014-02-10
File Format
application/pdf
Citation Information
Ömer Özgür Çapraz, Kurt R. Hebert and Pranav Shrotriya. "In Situ Stress Measurement During Aluminum Anodizing Using Phase-Shifting Curvature Interferometry" Journal of the Electrochemical Society Vol. 160 Iss. 1 (2013) p. D501 - D506
Available at: http://works.bepress.com/capraz/1/