Corrosion resistance of welding joint from titanium in water solution of hydrochloric acid

Purpose: Most of conducted research in the area of welded joints corrosion are concentrated on determine the corrosion resistance in water solution of hydrochloric acid medium at high temperatures. Recognizing of corrosion mechanisms in liquid mediums can lead to obtain corrosion-proof material e.g. by applying passivation phenomenon. In this paper attention was paid to determine the corrosion resistance of titanium welding joint in corrosive medium of liquid hydrochloric acid with concentration of 6 and 10%. Research of material susceptibility to surface activation in the pipeline of corrosion processes are conducted. Design/methodology/approach: In the corrosion tests electrolyser, potentiostat "Solartron 1285" and computer with "CorrWare 2" software were used. Results of the research were worked out with "CorrView" software. The potentials values were determined in relation to normal hydrogen electrode (NEW). The temperature of the solutions was kept at 20 and 50 degrees centigrade. The recording of potential/density of current - time curve was conducted for 300 s. Findings: The results of research, which were conducted in 6% and 10% HCI solution, show good corrosion resistance of welding joints from titanium Gr1 in temperature 20 degrees centigrade. Tested samples were characterized by susceptibility to surface self-passivation, with the exception of samples tested at temperature of 50 degrees centigrade in HCl water solution. Damages of titanium passive surface during exploitation can lead to short-lived increase of corrosion rate in higher temperatures. Practical implications: Results of corrosion research allow to determine the durability of welded joints in 6% and 10% water solution of hydrochloric acid at temperature 20 and 50 degrees centigrade. Originality/value: The goal of this work was to determine the influence of GTAW welding method on corrosion resistance of welded joints from titanium in 6% and 10% HCl water solutions.