In this work, the inhibition effect of nitrate on the pitting corrosion of 17-4PH stainless steel was investigated in the chloride solution. Potentiodynamic and potentiostatic techniques were used to measure the pitting potential and induction time in various concentrations of chloride and nitrate ions. According to the results, the equation of 
was developed to show the relationship between the pitting potential and the concentrations of nitrate and chloride ions at room temperature. Moreover, it has been shown when the ratio of 
is greater than a threshold value of 0.35, the alloy remains passive in whole potentials during the potentiodynamic experiments. In addition, the results indicated that pitting is rarely observed in the potentials above the 400 mVSCE in the chloride solutions containing nitrate.
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1 February 2017
Research Article|
October 09 2016
Inhibitive Effect of Nitrate on Pitting Corrosion of 17-4PH Stainless Steel
M. Seyedi;
M. Seyedi
*Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran.
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M. Mirjalili;
M. Mirjalili
*Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran.
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I. Taji;
I. Taji
*Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran.
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O. Armat;
O. Armat
*Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran.
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M.H. Moayed
M.H. Moayed
‡
*Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran.
‡Corresponding author. E-mail: [email protected]
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‡Corresponding author. E-mail: [email protected]
Received:
June 24 2016
Revision Received:
October 09 2016
Accepted:
October 09 2016
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2017, NACE International
2017
CORROSION (2017) 73 (2): 181–191.
Article history
Received:
June 24 2016
Revision Received:
October 09 2016
Accepted:
October 09 2016
Citation
M. Seyedi, M. Mirjalili, I. Taji, O. Armat, M.H. Moayed; Inhibitive Effect of Nitrate on Pitting Corrosion of 17-4PH Stainless Steel. CORROSION 1 February 2017; 73 (2): 181–191. https://doi.org/10.5006/2181
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