Semiconducting properties of passive films formed on AISI ۴۲۰ stainless steel in nitric acid solutions
Publish Year: 1392
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMATPR-1-4_002
تاریخ نمایه سازی: 12 مهر 1400
Abstract:
This study focuses on the semiconductor properties of passive films formed on AISI ۴۲۰ stainless steel immersed in four nitric acid solutions under open circuit potential (OCP) conditions. For this purpose, the passivation parameters and semiconductor properties of passive films were derived from potentiodynamic polarization and Mott–Schottky analysis, respectively. The OCP plots showed that the open circuit potential of AISI ۴۲۰ stainless steel is directed towards positive amount, which are indicative of the formation of passive film and its role in increasing protectivity with time. The potentiodynamic polarization results showed that the corrosion current density of AISI ۴۲۰ stainless steel increased with the increase in the concentration of solutions. Mott–Schottky analysis revealed that the existence of a duplex passive film structure composed of two oxide layers of distinct semiconductivities (n-type and p-type). Also, Mott–Schottky analysis indicated that the donor densities are in the range ۱۰۲۱ cm-۳ and increased with solution concentration.
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Authors
Arash Fattah-alhosseini
Department of Engineering, Bu-Ali Sina University, Hamedan, Iran
Mohammad Mehdi Khalvan
Department of Engineering, Bu-Ali Sina University, Hamedan, Iran
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