An Experimental Study on High Temperature Corrosion of TP347H Stainless Steel in Molten Chloride and Sulfate

Abstract 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 FexOy, and the oxides such as Fe2O3, Fe3O4, Ni1.43Fe1.7O4 and NiFe2O4 are dissolved with the increase of temperature. NbO with higher stability is formed on the surface at 650 °C, which help Cr2O3 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.

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THE SYNTHESIS AND PROPERTIES OF THE ANHYDROUS HEXACHLOROZIRCONATES OF SODIUM AND POTASSIUM

Canadian Journal of Chemistry ◽

10.1139/v64-170 ◽

1964 ◽

Vol 42 (5) ◽

pp. 1102-1105 ◽

Cited By ~ 15

Author(s):

R. L. Lister ◽

S. N. Flengas

Keyword(s):

Alkali Metal ◽

Closed System ◽

Metal Chloride ◽

X Ray Diffraction ◽

Zirconium Tetrachloride ◽

Melting Points ◽

Alkali Metal Chloride ◽

X Ray ◽

Diffraction Patterns ◽

Sodium And Potassium

The hexachlorozirconates of sodium and potassium have been produced in a closed system following the reaction:[Formula: see text]where M is Na and K, respectively. The zirconium tetrachloride was reacted at approximately 1 atm. pressure, and at temperatures of the alkali metal chloride between 425 °C and 525 °C. The densities, melting points, and the corresponding X-ray diffraction patterns for both compounds have been determined.

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Temperature and composition dependences of shear viscosities for molten alkali metal chloride binary systems by molecular dynamics simulation

Journal of Molecular Liquids ◽

10.1016/j.molliq.2018.10.062 ◽

2019 ◽

Vol 273 ◽

pp. 447-454 ◽

Cited By ~ 6

Author(s):

Jia Wang ◽

Cheng-Lin Liu

Keyword(s):

Molecular Dynamics ◽

Molecular Dynamics Simulation ◽

Alkali Metal ◽

Binary Systems ◽

Metal Chloride ◽

Dynamics Simulation ◽

Alkali Metal Chloride

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Investigation of diffusion alloying time on electrochemical behavior and conductivity of Nb-modified AISI 430 SS as PEMFC bipolar plate

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-11-2018-2035 ◽

2019 ◽

Vol 66 (4) ◽

pp. 520-526

Author(s):

Fupeng Cheng ◽

Jinglong Cui ◽

Shuai Xu ◽

Hongyu Wang ◽

Pengchao Zhang ◽

...

Keyword(s):

Electrical Conductivity ◽

Stainless Steel ◽

Corrosion Resistance ◽

Electrochemical Behavior ◽

Surface Conductivity ◽

Proton Exchange ◽

Corrosion Mechanism ◽

Content Type ◽

Surface Electrical Conductivity ◽

Aisi 430

Purpose The purpose of this paper is to improve the surface electrical conductivity and corrosion resistance of AISI 430 stainless steel (430 SS) as bipolar plates for proton exchange membrane fuel cells (PEMFCs), a protective Nb-modified layer is formed onto stainless steel via the plasma surface diffusion alloying method. The effect of diffusion alloying time on electrochemical behavior and surface conductivity is evaluated. Design/methodology/approach In this work, the surface electrical conductivity and corrosion resistance of modified specimen are evaluated by the potentiodynamic and potentionstatic polarization tests. Moreover, the hydrophobicity is also investigated by contact angle measurement. Findings The Nb-modified 430 SS treated by 1.5 h (1.5Nb) presented a lower passivation current density, lower interfacial contact resistance and a higher hydrophobicity than other modified specimens. Moreover, the 1.5 Nb specimen presents a smoother surface than other modified specimens after potentionstatic polarization tests. Originality/value The effect of diffusion alloying time on electrochemical behavior, surface conductivity and hydrophobicity of modified specimen is evaluated. The probable anti-corrosion mechanism of Nb-modified specimen in simulated acid PEMFC cathode environment is presented.

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