Investigation of aging phenomena caused by corrosion of stainless steels, commercial pure titanium and titanium alloys in chemical plants using nitric acid

Hirose, Fumimasa*; Nakahara, Masahiro*; Ueno, Fumiyoshi  ; Uchiyama, Gunzo ; Nojima, Yasuo*

To study aging phenomena caused by corrosion of stainless steels, commercial pure titanium and titanium alloys in chemical plants using nitric acid, corrosion incidents, experiences of materials installation, corrosion tests results under actual and simulated environments were investigated in this report. The results were compared with literatures. As the results, it was clarified that corrosion of SUS304L and SUS310ELC were accelerated at heat affected zone and weld metal, respectively. In the cases of commercial pure titanium and titanium alloys, corrosion were accelerated at the portion in the environments without Ti ion. Finally, corrosion lives and application conditions of these materials in nitric acid environment were considered.