To support installed tube lines, plastic clamp systems (which cause a high risk of corrosion failure of the pipe and tube) have been widely used. Crevice corrosion resistance of such was investigated based on the standard test methods. Characteristics were analyzed and operational life time estimated.
Results of exposing UNS R56404 forging and pipe product forms to liquid mercury over the 25°-232°C range while highly stressed at & beyond the alloy’s yield point via three loading modes are reported. Included are: sustained load 90 day C-ring tests, slow strain rate tensile testing, and rippled slow strain rate cyclic tensile loading.
A model was built that describes stress field and hydrogen activity at the direct vicinity of a crack tip. A second model was based on the cohesive zone simulates the kinetic of a crack growth. Experiments using hydrogen permeation under stress on flat un-notched & notched specimens yielded data comparable to the simulations.