The National Academies

NCHRP IDEA 20-30/IDEA 100 [Completed (IDEA)]

Evaluation of Al-Zn-In Alloy for Galvanic Cathodic Protection of Bridge Decks
[ NCHRP 20-30 (NCHRP-IDEA) ]

  Project Data
Staff Responsibility: Dr. Inam Jawed

This project’s goal was to develop and evaluate a galvanic anodic system based on Al-Zn-In alloy for the corrosion protection of bridge decks.  The most practical anode configuration was found to be an aluminum metal mesh on which the Al-Zn-In alloy anode was applied by thermal spray. A thermally-sprayed Al-Zn-In anode mesh, approximately 550 square feet in area, was installed on a bridge deck in Cuba, Missouri, in 2005 and is being monitored. Localized delamination of the anode on the bridge deck has been observed.  Testing in October 2008 revealed additional delamination and a significant reduction in anode current output. Material supply problems and the implementation of this task have delayed the installation of additional test installations. While this does not preclude the use of this technology, further work is needed to evaluate and resolve these issues.  A final report detailing the research work and findings has been submitted.  The final report will be available from the National Technical Information Service (NTIS # PB2010-101385).

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