Iranian Journal of Materials Science and Engineering
Iran University of Science & Technology
Thu, Nov 14, 2024
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Volume 10, Issue 4 (december 2013)
IJMSE 2013, 10(4): 31-42 |
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A. Fattah-alhosseini, H. Farahani. ELECTROCHEMICAL BEHAVIOUR OF AISI 304 STAINLESS STEEL IN SULFURIC SOLUTION: EFFECTS OF ACID CONCENTRATION. IJMSE 2013; 10 (4) :31-42
URL: http://ijmse.iust.ac.ir/article-1-605-en.html
URL: http://ijmse.iust.ac.ir/article-1-605-en.html
Abstract: (20640 Views)
The effects of H2SO4 concentration on the electrochemical behaviour of passive films formed on AISI 304 stainless steel were investigated using by potentiodynamic polarization, Mott–Schottky analysis and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization indicated that the corrosion potentials were found to shift towards negative direction with an increase in solution concentration. Also, the corrosion current densities increase with an increase in solution concentration. Mott–Schottky analysis revealed that the passive films behave as n-type and p-type semiconductors at potentials below and above the flat band potential, respectively. Also, Mott– Schottky analysis indicated that the donor and acceptor densities are in the range 1021 cm-3 and increased with solution concentration. EIS data showed that the equivalent circuit Rs(Qdl[Rct(RrQr)]) by two time constants is applicable.
Keywords: Stainless steel, Concentration, Potentiodynamic polarization, Equivalent circuit, Mott–Schottky
Type of Study: Research Paper |
Subject:
materials engineeing and special subjects
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