Corrosion assessment of nitric acid grade austenitic stainless steels

Ningshen, S.; Mudali, U. Kamachi; Amarendra, G.; Raj, Baldev

doi:10.1016/j.corsci.2008.09.038

Cited by 93 publications

(53 citation statements)

References 17 publications

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“…Conversely, in acid solutions a chromium-rich oxide film is formed due to slower dissolution of chromium oxide when compared to iron oxide [3,4]. It is found that nitric acid concentration has a significant effect on the corrosion behaviour of stainless steel [5]. In the other study, the anodic polarization curves showed no significant changes in corrosion potential even with an increase in nitric acid concentration in the presence of oxidizing ions [6].…”

Section: Introductionmentioning

confidence: 82%

Effect of solution pH on the electrochemical behaviour of AISI 304 austenitic and AISI 430 ferritic stainless steels in concentrated acidic media

Fattah‐alhosseini

Vafaeian

2015

Egyptian Journal of Petroleum

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In this study, the effect of solution pH on the electrochemical behaviour of AISI 304 austenitic and AISI 430 ferritic stainless steels at open circuit potential (OCP) in concentrated acidic solutions was studied. Polarization curves showed that the corrosion current density of both stainless steels increased with decreasing pH. Mott-Schottky analysis revealed that passive films formed on AISI 304 and AISI 430 stainless steels behave as n-type and p-type semiconductors and the donor and acceptor densities increased with decreasing pH. Electrochemical impedance spectroscopy (EIS) results showed that the reciprocal capacitance of the passive film is directly proportional to its thickness which decreases with decreasing pH. Thus for both austenitic and ferritic stainless steels in acidic solutions, increasing the solution pH offers better conditions for forming passive films with higher protection behaviour, due to the growth of much thicker and less defective films. ª 2015 Production and hosting by Elsevier B.V. on behalf of Egyptian Petroleum Research Institute. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

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Section: Introductionmentioning

confidence: 82%

Effect of solution pH on the electrochemical behaviour of AISI 304 austenitic and AISI 430 ferritic stainless steels in concentrated acidic media

Fattah‐alhosseini

Vafaeian

2015

Egyptian Journal of Petroleum

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“…From the alleviated corrosion damage, one can conclude that the ECAPed Al-5 mass% Cu alloys have presented less susceptibility to IGC compared to the as-cast one. Electrochemical test, especially the EIS measurement has already been applied to investigate the susceptibility to IGC of Al alloys [28,29]. Via the EIS measurement, the electrochemical characteristics evolution during the IGC process can be studied quantitatively.…”

Section: Efc Testsmentioning

confidence: 99%

Significantly changed intergranular corrosion and exfoliation corrosion behavior of the ultra‐fine grained Al–5 mass% Cu alloy fabricated by ECAP

Song

Jiang

et al. 2013

Materials & Corrosion

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Significantly changed intergranular corrosion (IGC) and exfoliation corrosion (EFC) behaviors of the equal-channel-angular-pressed (ECAPed) Al-Cu alloy were discovered through immersion test, electrochemical measurements, and microstructure observation. The ECAPed alloys with ultra-fine grained (UFG) a(Al) matrix and extremely refined u-phase particles displayed obvious decreased IGC sensitivity, but deteriorated susceptibility to EFC. The decreased IGC sensitivity of ECAPed alloys presented decreased IGC propagation depths in immersion test in NaCl þ H 2 O 2 solutions and increased polarization resistance in electrochemical impedance spectrum test in MIL-H-600 solution. The reason for the decreased IGC sensitivity was the breakage of the net structure of u phase during ECAP process, which destroys the continuity of IGC propagation channel. The deteriorated susceptibility to EFC of ECAPed alloys in EXCO solution presented gradual evolution from serious IGC attack into obvious lamellar EFC, and finally complete dissolution of surface grains. Meanwhile, the EFC propagation depths were sharply decreased with the increasing ECAP passes. This phenomenon was caused by the aspects ratio evolution of deformed grains and the gradually decreased IGC sensitivity of the ECAPed alloys.

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“…It is known in literature that on the coprecipitation process a thin ceramic layer of iron and zinc phosphate is formed (Zn 2 Fe(PO 4 ) 2 ·4H 2 O), which asures a good corrosion resistance and as a suport layer for concrete [9][10][11][12][13]. …”

Section: Resultsmentioning

confidence: 99%

“…The corrosion behavior depends on numerous factors: the metal or alloy and its properties, the corrosive medium and its concentration, temperature, and other environmental factors [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Evaluation of Some Phosphated Thin Layers on Reinforcing Steel

Lazar

Bejinariu

Sandu

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this work we studied the evaluation of corrosion of chemical deposited phosphate layers on the OB37 steel used in construction. The experimental determinations were performed for short term immersion, and the samples were characterized by scanning electron microscopy. By using electro-chemical impedance spectroscopy, the corrosion speed of the alloys was investigated. The corrosive resistance of the reinforcing steel is much improved.

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Corrosion assessment of nitric acid grade austenitic stainless steels

Cited by 93 publications

References 17 publications

Effect of solution pH on the electrochemical behaviour of AISI 304 austenitic and AISI 430 ferritic stainless steels in concentrated acidic media

Effect of solution pH on the electrochemical behaviour of AISI 304 austenitic and AISI 430 ferritic stainless steels in concentrated acidic media

Significantly changed intergranular corrosion and exfoliation corrosion behavior of the ultra‐fine grained Al–5 mass% Cu alloy fabricated by ECAP

Corrosion Evaluation of Some Phosphated Thin Layers on Reinforcing Steel

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