Volume 15, Issue 3 (12-2025)
مهندسی خوردگی 2025, 15(3): 8-8 |
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Investigating the characteristics of the duplex stainless steel 2205 passive film and its role in corrosion and cavitation resistance. مهندسی خوردگی 2025; 15 (3) :8-8
URL: http://journal.ica.ir/article-1-256-en.html
URL: http://journal.ica.ir/article-1-256-en.html
Abstract: (19 Views)
This research investigated the possibility of using the passivation process to improve the properties of the passive film formed on duplex stainless steel 2205 to increase the resistance of this alloy to corrosion and cavitation. To apply the passivation conditions according to the polarization curve in the salt environment of 3.5% NaCl containing CO2, two passivation areas 1 and 2 were selected, and two samples P1 and P2 were passivated at potentials of 0.4 and 0.8 V vs. Ag/AgCl reference electrode for 3 hours in these two areas. Then, using electrochemical impedance spectroscopy EIS, the Mott-Schottky method, optical microscopes OM, SEM, surface roughness tests, and nano-indentation tests before and after cavitation, the electrical, electronic, and mechanical properties of P1 and P2 passive films have been investigated, and compared with a conventional passive film formed in air AF. The effect of cavitation erosion on the surface of the sample was created in an ultrasonic cavitation system. The obtained results show that the thickness of the P1 passive film was about 2.66 nm, its structure is homogeneous and compact on the ferrite and austenitic regions, the charge carrier density or the density of point defects in it was 6.58x1021 cm-3, and the average surface roughness was 0.11 µm. In addition, the other parameters for this film were; the breaking load Lb = 143 µN, indentation depth δ0 = 8.3 nm, indentation length δex = 5.5 nm, Young's modulus Es = 248 GPa, and fracture stress σb = 4.7 GPa. Therefore, it can be concluded that the passivation of the surface of sample P1 led to the improvement of the resistance to corrosion and cavitation, while the passivation of the surface of sample P2 close to the trans-passive area caused the resistance to decrease.
Keywords: Electronic properties, electrochemical properties, mechanical properties, cavitation resistance, passive film.
Type of Study: Research |
Subject:
General
Received: 2026/02/2 | Accepted: 2025/12/21 | Published: 2025/12/21
Received: 2026/02/2 | Accepted: 2025/12/21 | Published: 2025/12/21
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