Corrosion Behavior of Different Types of Stainless Steel in PBS Solution

Senka Gudić, Aleš Nagode, Kristina Šimić, Ladislav Vrsalović and Sonja Jozić
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Senka Gudić: Faculty of Chemistry and Technology, University of Split, 21000 Split, Croatia
Aleš Nagode: Faculty of Natural Science and Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia
Kristina Šimić: Faculty of Chemistry and Technology, University of Split, 21000 Split, Croatia
Ladislav Vrsalović: Faculty of Chemistry and Technology, University of Split, 21000 Split, Croatia
Sonja Jozić: Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, 21000 Split, Croatia

Sustainability, 2022, vol. 14, issue 14, 1-19

Abstract: Anodic and spontaneous corrosion of different types of stainless steel (AISI 304L, AISI 316L and 2205 DSS) in phosphate-buffered saline solution (PBS, pH = 7.4) at 37 °C (i.e., in simulated physiological solution in the human body) were examined using open circuit potential measurements, linear and cyclic polarization, and electrochemical impedance spectroscopy methods. After the anodic and spontaneous corrosion, the surface of the tested samples was investigated by light and scanning electron microscopy (SEM) with EDS analysis. It has been established that the tendency of the examined steel materials towards local corrosion decreases in the order: AISI 304L < AISI 316L < 2205 DSS. Namely, the possibility of repassivation and the resistance to local corrosion increases in the same order. The corrosion resistance of steel samples at open circuit potential is a consequence of forming a natural oxide film with a bi-layer structure and consists of an inner barrier and an outer porous film. The inner barrier film has a small thickness and extremely high resistance, while the outer porous film is much thicker but also has significantly lower resistance. The inner barrier layer mainly prevents corrosion of examined steel samples in order: AISI 304L < AISI 316L < 2205 DSS. Light microscopy and SEM/EDS analysis after pitting and spontaneous corrosion showed damage on the AISI 304L and AISI 316L surface, while the surface of 2205 DSS was almost undamaged by corrosion.

Keywords: stainless steel; phosphate buffer solution; pitting corrosion; spontaneous corrosion; oxide film (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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