Microelectrode Test Configurations for Measurement of Galvanic Current Under Saline Drops in Simulated Atmospheric Conditions

This work investigates galvanic corrosion of UNS A97075 (AA7075-T6) coupled with a stainless steel UNS S13800 (CRES 13-8) in a simulated atmospheric environment under electrolyte droplets. Three different electrochemical test configurations were compared to understand galvanic corrosion in droplet e...

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Bibliographic Details
Published in:ECS transactions 2017-01, Vol.75 (29), p.11-22
Main Authors: Hangarter, Carlos, Policastro, Steven A
Format: Article
Language:English
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Summary:This work investigates galvanic corrosion of UNS A97075 (AA7075-T6) coupled with a stainless steel UNS S13800 (CRES 13-8) in a simulated atmospheric environment under electrolyte droplets. Three different electrochemical test configurations were compared to understand galvanic corrosion in droplet electrolytes. Micro-pipets were utilized to electrochemically examine alloys and determine galvanic corrosion current from droplet polarization scans. Additionally a novel galvanic corrosion cell with two distinct droplet half cells joined by a micro-pipet salt bridge was constructed to observed galvanic atmospheric corrosion rates in dynamic environmental conditions. The last configuration examined a galvanic couple in contact with a single drop and exhibited corrosion behavior distinct from the latter design to due to reaction product interactions.
ISSN:1938-5862
1938-6737
1938-6737
1938-5862
DOI:10.1149/07529.0011ecst