Cathodic delamination of marine hardware: Causes and mitigation strategies
Tom Ramotowski, Ph.D.
NAVSEA Warfare Center Newport
Wednesday, April 6, 2005
Pacific Forum – 3:00 p.m.
Anyone interested in designing or building hardware, devices, or vehicles for marine use needs to be concerned about "cathodic delamination", a phenomenon responsible for many of the bonding/adhesion failures observed between metal and polymer substrates in the ocean. Cathodic potentials applied to metal substrates to prevent seawater-induced corrosion initiate the delamination. Understanding the mechanism of cathodic delamination is important so that mitigation strategies can be developed and implemented. "Accelerated life testing" (ALT)— a technique in which temperature increases are used to accelerate the rate of a degradation process—has proven useful in this regard. This presentation will introduce the concept of cathodic delamination, and discuss technical issues related to cathodic delamination ALT. The presentation concludes with a review of mitigation strategies currently being employed or considered by the U.S. Navy to reduce maintenance costs and increase the useful service life of hardware in the marine environment subject to cathodic delamination.