Electrochemical, galvanic, and mechanical responses of grade 2 titanium in6% sodium chloride solution

The electrochemical, galvanic, and mechanical responses of grade 2 titanium in 6% sodium chloride (NaCl) solution at different temperatures were inves tigated. The initial corrosion potential and cathodic reaction rate increas ed with decreasing pH and increasing temperature. The initial corrosion pot ential changed when titanium was coupled with other metals, Naval brass and alloy 600 (UNS N06600) anodically polarized titanium, while zinc and alumi num caused titanium to become a cathode. HY80 dagger steel (UNS K31820), ty pe 316 stainless steel ([SS] UNS 531600), and Monel K500 dagger (UNS N05500 , a copper-nickel alloy), polarized titanium anodically or cathodically dep ending upon temperature and pH. Hydrides formed on the titanium surface at potentials < similar to -600 mV(SCE) to -700 mV(SCE). Zinc at all temperatu res and HY80 at high temperatures caused hydride formation in titanium when coupled galvanically with titanium. Mechanical tests showed an approximate to 10% decrease in ductility under prior and dynamic hydrogen charging con ditions.