Pitting-Resistant Alloys in Highly Concentrated Chloride Media

Bandy, R.; Rooyen, D. van

doi:10.5006/1.3580841

Cited by 64 publications

(25 citation statements)

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“…This is believed to be mainly due to the high N alloying in the HNSSs. There is generally agreement that N alloying improves the pitting corrosion resistance of austenitic stainless steels, increasing the pitting potential and decreasing the corrosion rate in aqueous chloride solutions (Ref [26][27][28]. The beneficial roles of N are usually attributed to that N can be concentrated on metal and oxidized surfaces to produce ammonium ions on the metal surface, and furthermore it can combine with Mo to form a more stable and dense passive film, thereby enhancing the corrosion resistance of stainless steels.…”

Section: Discussionmentioning

confidence: 99%

“…Typical mechanisms to explain the beneficial roles of N alloying on corrosion properties of stainless steels consist of theories of ammonia production ( Ref 11,12), surface enrichment (Ref [13][14][15], anodic segregation (Ref [16][17][18], salt film formation (Ref 19), and synergistic effects of N, Mo, and chromium ( Ref 16,[20][21][22]. However, there is still a fair amount of controversy regarding the independent and synergistic effects of N and Mo alloying on general corrosion or active dissolution ( Ref 7,[23][24][25], passive film properties (Ref [25][26][27], pitting resistance (Ref [28][29][30], and stress corrosion cracking ( Ref 31,32). The related mechanisms are still under debate.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Pitting Corrosion of Nickel-Free and Manganese-Alloyed High-Nitrogen Stainless Steels

Huang

et al. 2009

J. of Materi Eng and Perform

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Pitting corrosion behavior of three kinds of nickel-free and manganese-alloyed high-nitrogen (N) stainless steels (HNSSs) was investigated using electrochemical and immersion testing methods. Type 316L stainless steel (316L SS) was also included for comparison purpose. Both solution-annealed and sensitization-treated steels were examined. The solution-annealed HNSSs showed much better resistance to pitting corrosion than the 316L SS in both neutral and acidic sodium chloride solutions. The addition of molybdenum (Mo) had no further improvement on the pitting corrosion resistance of the solution-annealed HNSSs. The sensitization treatment resulted in significant degradation of the pitting corrosion resistance of the HNSSs, but not for the 316L SS. Typical large size of corrosion pits was observed on the surface of solutionannealed 316L SS, while small and dispersed corrosion pits on the surfaces of solution-annealed HNSSs. The sensitization-treated HNSSs suffered very severe pitting corrosion, accompanying the intergranular attack. The addition of Mo significantly improved the resistance of the sensitization-treated HNSSs to pitting corrosion, particularly in acidic solution. The good resistance of the solution-annealed HNSSs to pitting corrosion could be attributed to the passive film contributed by N, Cr, and Mo. The sensitization treatment degraded the passive film by decreasing anti-corrosion elements and Cr-bearing oxides in the passive film.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on Pitting Corrosion of Nickel-Free and Manganese-Alloyed High-Nitrogen Stainless Steels

Huang

et al. 2009

J. of Materi Eng and Perform

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“…This will certainly inhibit autocatalytic process of pit formation and increase the opportunity for any pit to heal. The addition of small amounts of nitrogen can enhance the pitting resistance and passivation characteristics [12]. A synergistic influence of nitrogen and molybdenum on pitting corrosion resistance has noticed and enrichment of molybdenum and nitrogen on the surface at a level of at least seven times that the original concentration of nitrogen present in the alloy [14].…”

Section: Methodsmentioning

confidence: 99%

Electrochemical corrosion behavior of alloy 31 using dynamic electrochemical impedance spectroscopy

Srinivasan

Rajendran

2010

Trans. Mat. Res. Soc. Japan

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Potentiodynamic anodic polarisation and Dynamic Electrochemical Impedance Spectroscopic (DEIS) measurements were carried out on type 316L stainless steel (SS) and alloy 31 in natural sea water in order to assess the pitting corrosion resistance. DEIS measurements were performed over a wide range of potentials covering the corrosion potential, passive region, breakdown region and dissolution region. It was shown that the impedance measurements in potentiodynamic conditions allow instantaneous investigation of changes in passive layer with potential. The impedance spectra of various potential regions were also discussed. From the above studies, the pitting corrosion resistance of the alloys 31 was higher than 316L SS; due to the higher contents of nitrogen, chromium and molybdenum.

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“…[1][2][3] The greatest effect of nitrogen has been observed in molybdenumbearing stainless steels, suggesting a possible synergism between molybdenum and nitrogen. [4][5][6] However, a variety of opinions exists on the mechanism by which the nitrogen improves the localized corrosion resistance. In summary, the effect of nitrogen may be related to its ability to do one or more of the following: -Structurally homogenize the alloy.'…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitriding on the Anodic Behavior of Iron and Its Significance in Pitting Corrosion of Iron-Based Alloys

Lu¹,

Luo²,

Ives³

1991

CORROSION

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The anodic behavior of both pure iron and nitrided iron has been studied in chloride-containing aqueous solutions at neutral and acidic pH values. The structure of the nitride has been characterized by X-ray diffraction. Surface nitrides may modify the anodic kinetics of stainless steel at the stage of pitting initiation by inhibition of the anodic dissolution of iron. Micro-electrode measurements performed in simulated pits have provided supporting evidence.

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Pitting-Resistant Alloys in Highly Concentrated Chloride Media

Cited by 64 publications

References 0 publications

Investigation on Pitting Corrosion of Nickel-Free and Manganese-Alloyed High-Nitrogen Stainless Steels

Investigation on Pitting Corrosion of Nickel-Free and Manganese-Alloyed High-Nitrogen Stainless Steels

Electrochemical corrosion behavior of alloy 31 using dynamic electrochemical impedance spectroscopy

Effect of Nitriding on the Anodic Behavior of Iron and Its Significance in Pitting Corrosion of Iron-Based Alloys

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