The purpose of this study is to evaluate the relative corrosion rates of 316-L stainless steel cast metal, cold worked, and powdered metal brackets. This is done using potentiodynamic anodic polarization to measure the voltage difference between the samples and a reference electrode. Corrosion layers effect current flow and by plotting how the current responds to an applied voltage it is possible to determine the corrosion rate of a sample. The point at where the applied voltage breaks down the passivation or oxidation layer is recorded and the relative corrosion rate is figured using the formula: Corrosion Rate (mpy) (in milliinches per year) = [(k) (Icorr) Equivalent Weight] /Density. (K is a known constant and Icorr is current density in microamps per cm2) The results indicate that the powdered metal samples had the smallest relative corrosion rate with .2256mpy, cast metal was next with .4639mpy, and cold worked had the greatest corrosion rate with 2.8135mpy.
J. Milford Anholm
Garland E. Scott
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Orthodontic Appliances; Corrosion
Loma Linda University Libraries
This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Ballweber, Timothy C., "Corrosion of Orthodontic Brackets: Cost, Cold Worked, and Powdered Metal" (1985). Loma Linda University Electronic Theses, Dissertations & Projects. 1293.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives