Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11000508 | Electrochimica Acta | 2018 | 44 Pages |
Abstract
The corrosion behavior of the 18Ni 300-grade maraging steel in 0.6â¯molâ¯Lâ1 NaCl solution, containing 1â¯mmolâ¯Lâ1 H2S, and saturated with CO2, was investigated by measurement of the open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The maraging steel was solution-treated at 840â¯Â°C for 1â¯h and aged at 650â¯Â°C for 3â¯h. All corrosion electrochemical tests proved that the austenitic phase formed during the aging thermal treatment was detrimental to corrosion resistance of the 18Ni 300-grade maraging steel. The analysis of the XPS spectra suggested that FeCO3, Fe2O3, FeS2, FeSO4, NiO, Ni(OH)2, NiS, NiSO4, MoO2, MoO3 and MoS2 were the corrosion products deposited on the surface of both maraging steel samples after 29 days of immersion in the testing solution. Lastly, for industrial application requiring the corrosion resistance property of the 18Ni 300 grade maraging steel, it is recommended that it be thermal solution-treated before its use.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Archimedes F. Avelino, Walney S. Araújo, Diego F. Dias, Luis Paulo M. dos Santos, Adriana N. Correia, Pedro de Lima-Neto,