Open AccessAn Experimental Study on High Temperature Corrosion of TP347H Stainless Steel in Molten Chloride and Sulfate
Author(s) -
Weixin Yu,
Xiaoyu Chu,
Huihui Zhang,
Yue Shen,
Kangning Tao,
Jueyan Li
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2101/1/012064
Subject(s) - corrosion , intergranular corrosion , materials science , metallurgy , chloride , scanning electron microscope , alkali metal , molten salt , metal , atmospheric temperature range , composite material , chemistry , physics , organic chemistry , meteorology
The corrosion resistance of TP347H stainless steel was evaluated by measuring mass loss in molten salt at 500-650°C. The corrosion mechanism was characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that the corrosion resistance of TP347H stainless steel increases with the increase of corrosion temperature. When the temperature is below 600°C, TP347H mainly generate low-stable Fe x O y , and the oxides such as Fe 2 O 3 , Fe 3 O 4 , Ni 1.43 Fe 1.7 O 4 and NiFe 2 O 4 are dissolved with the increase of temperature. NbO with higher stability is formed on the surface at 650 °C, which help Cr 2 O 3 and NiO retain for a longer time. Mn-containing compounds on the surface further improve corrosion resistance of TP347H. The corrosion of TP347H stainless steel is mainly intergranular corrosion, and the temperature range of corrosion is consistent with the melting range of alkali metal chloride. Therefore, the molten alkali metal chloride plays a decisive role in the corrosion of TP347H stainless steel.