SYMPOSIA PAPER Published: 01 January 1993

Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy for the Statistical Process Control of Aluminum Anodizing


Industrial and military specifications often require the use of a 300+ h salt spray exposure method to test anodized aluminum coupons and evaluate the quality of anodizing processes. In addition to the salt spray (fog) exposure test being time consuming, its results are highly interpretive and therefore relatively imprecise. The long duration of the test itself makes it a poor tool for monitoring daily plant operation of anodizing baths. An electrochemical procedure has recently been developed to evaluate the quality of anodized aluminum coupons. This procedure is based on the electrochemical activation of the material under test followed by corrosion resistance measurements with either potentiodynamic polarization or electrochemical impedance spectroscopy (EIS) in a cell designed to accept coupons prepared for salt spray testing. Results obtained formed the statistical basis to establish accelerated electrochemical tests as a routine plant monitoring of aluminum anodizing.

Author Information

Roberge, PR
Royal Military College, Kingston, Ontario, Canada
Halliop, E
Royal Military College, Kingston, Ontario, Canada
Yousri, S
Chemical Technology and Purchasing Liaison, Pratt and Whitney Canada Inc., Longueuil, Quebec, Canada
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Developed by Committee: G01
Pages: 313–327
DOI: 10.1520/STP18077S
ISBN-EB: 978-0-8031-5240-3
ISBN-13: 978-0-8031-1861-4