Effect of Anionic and Cationic Oxidizing Species on Crevice Corrosion Resistance of Titanium in Brine Media

摘要

One of the suggested strategies for preventing crevice corrosion of titanium is by incorporating inhibitors into the solutions. These inhibitors can be anionic species which are intended to inhibit crevice attack when present in solutions, especially in halides. It is well known that oxidizing cationic species such as ferric and cupric ions which are very effective in reducing general corrosion resistance tend to accelerate crevice corrosion when present in bulk chloride solutions. At the same time, certain anionic oxidizing species such as chlorates are believed to inhibit crevice corrosion in halide solutions through crevice diffusion. In this study, both anionic and cationic oxidizing species were incorporated into halide solutions to observe the effects. This study showed that all the anionic species not necessarily inhibit crevice corrosion of titanium and the inhibiting/accelerating mechanism is presented.