Reclamation Information Sharing Environment (RISE)

Corrosion protection is fundamental to achieve infrastructure longevity. Coatings are the primary defense against corrosion. The Bureau of Reclamation began a field study in 1949 at Shasta Dam Unit 5 Penstock. Originally 26 different linings were installed in the field trial, seventy years later a detailed inspection was conducted in 2019, seven linings were still providing corrosion protection. Additionally in 2009, spot repairs were conducted due to failed coal tar enamel using a 100% solids epoxy and was in excellent condition after 10 years of service. Each lining was evaluated using Electrochemical Impedance Spectroscopy (EIS) to determine the barrier properties.