Corrosion can be defined as the chemical or electrochemical deterioration of a material caused by the interaction with material environment. As industrial processes operate under harsh conditions, there is huge demand for corrosion resistant materials for infrastructure exposed to high pressures, high temperatures, and low pH HCl solutions. Material for this condition are essentially passive metals and alloys such as Titanium, Niobium and Tantalum. To support material selection for harsh industrial environments, a cost-effective high-pressure autoclave system was developed (up to 120 bar and 260 °C) using PTFE-lined seal lids. One of the lids has a valve to adjust the desired pressure and electrolytes are contained in PTFE vessel inside the autoclave. The study focuses on the corrosion properties of pure Ti grades and Ti-Pd alloys in aggressive conditions like pH 1 and 230 to 260 ºC. Corrosion performance was evaluated under both gaseous and aqueous conditions, with particular focus on anodic protection mechanisms and the influence of oxidizing species such as Cu²⁺ and Fe³⁺. Weight-loss experiments were carried out over 24, 72, and 120 hours to assess the impact of these oxidants on corrosion kinetics and passive-film stability. Both measures for improved corrosion properties, alloying with Pd and addition of oxidizing species results in a pronounced reduction of corrosion rate. The results of these measures are compared and their effects are critically discussed.
