07226 CPC Performance in Occluded Sites

Available for download

Product Number: 51300-07226-SG

ISBN: 07226 2007 CP

Author: Kendra Price, James F. Dante, and J.P. Buckingham

Publication Date: 2007

Member Price: $0.00

Non Member Price: $20.00

Price: $20.00

Qty:

The United States Marine Corps has experienced success employing thin water displacing Corrosion Preventive Compounds (CPCs) for the reduction of corrosion in occluded sites (i.e., around hinges and fasteners and under lap seams). However, no definitive test methodology has been established that clearly delineates relative corrosion protection requirements for the use of CPCs in occluded geometries. This work seeks to confirm the performance of commercially available CPCs in occluded sites by establishing a correlation between laboratory results and published field data, These findings will in turn yield a practical means of ranking candidate CPCs as well as a plausible method of testing these CPCs prior to application. Steel lap joint assemblies and galvanically coupled steel and aluminum lap joint assemblies were exposed to GM9540P conditions, A correlation of mass loss data from laboratory and accelerated outdoor exposures is presented for steel lap joints. The Washburn method was used to determine the candidate CPCs relative ability to wick into a crevice. Mass gain data taken from the Washburn method also provided a rough approximation of the amount of CPC that wicks in over time and the thickness of the protective layer formed. A regression analysis was performed on properties associated with wicking in order to determine which properties predominantly influence CPC performance.