Improved corrosion resistance of Ni–22Cr–13Mo–4W Alloy by surface nanocrystallization

Raja, Krishnan S.; Namjoshi, Shantanu; Misra, M.

doi:10.1016/j.matlet.2004.10.047

Cited by 56 publications

(43 citation statements)

References 13 publications

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“…According to Wang and Li [8,9] and Inturi and Szklarska-Smialowski [10] the corrosion resistance of nanocrystalline SS 304 in NaCl solution was enhanced in comparison with coarse-grained SS 304. Similarly, improved corrosion resistance of nanocrystalline N06022 in hot acid chloride solution was also reported [11]. Youssef and coworkers reported that nanocrystalline Zn coatings exhibited improved corrosion resistance in comparison to electrogalvanized steel in NaOH solution [12].…”

Section: Introductionmentioning

confidence: 67%

The influence of nanocrystalline state of iron on the corrosion inhibitor behavior in aqueous solution

Afshari

Dehghanian

2010

J Appl Electrochem

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Effect of grain size reduction on the electrochemical and corrosion behavior of iron of different grain sizes (32-320 nm) produced by direct and pulsed current electrodeposition was characterized using Tafel polarization curves and electrochemical impedance spectroscopy (EIS). The grain size of deposits was determined by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). The most intensive first-order peak (110) of the XRD patterns was taken for detailed analysis using a Gaussian fitting curve. The electrochemical tests were carried out in electrolyte 30 mg L -1 NaCl ? 70 mg L -1 Na 2 SO 4 ? 250 mg L -1 NaNO 2 aqueous solution. It was found that the corrosion potential and corrosion current density significantly changed as the microstructure morphology was changed. Results obtained from electrochemical tests suggested that the inhibition effect and corrosion protection of sodium nitrite inhibitor in nearneutral aqueous solutions increased as the grain size decreased from submicrocrystalline to nanocrystalline. This was attributed to the excess free energy, and concomitantly the increased number of the active sites caused by higher grain boundary and triple junction content in the nanocrystalline surface, which provides sites for electrochemical activity, and effect of sodium nitrite, was more pronounced.

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Section: Introductionmentioning

confidence: 67%

The influence of nanocrystalline state of iron on the corrosion inhibitor behavior in aqueous solution

Afshari

Dehghanian

2010

J Appl Electrochem

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“…According to the Mott-Schottky analysis, the relation between the space charge capacitance, C, of n-type and p-type semiconductors and the electrode potential, E, can be written as [2]:…”

Section: Mott-schottky Analysismentioning

confidence: 99%

“…Moreover, the excellent passive behavior of these alloys is B Arash Fattah-alhosseini a.fattah@basu.ac.ir 1 Department of Materials Engineering, Bu-Ali Sina University, 65178-38695 Hamedan, Iran well known in numerous solutions with pH values ranging from 1 to 13 [1][2][3]. For that reason, it is important and interesting to study the electrochemical behavior of the passive films formed on these alloys in diverse environments [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of the Passive Films Formed on Alloy 22 (UNS N06022) in Acidic Solutions

2015

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Passive behavior and semiconducting properties of alloy 22 in sulfuric and nitric acidic solutions were studied. Corrosion current density was measured from potentiodynamic polarization plots, defect density was drawn from Mott-Schottky analysis, and finally polarization resistance and passive film thickness were estimated by electrochemical impedance spectroscopy. Potentiodynamic polarization curves suggested that alloy 22 showed excellent passive behavior in both nitric and sulfuric solutions. Mott-Schottky analysis revealed that the passive films formed on alloy 22 in both acidic solutions behave as n-type and p-type semiconductors. Also, this analysis indicated that the donor and acceptor densities are in the range 10 21 cm −3 and increased with solution concentration. In conclusion, electrochemical impedance spectroscopy and Mott-Schottky analysis revealed that dilute nitric and sulfuric acidic solutions offer better conditions of the passive film formation on alloy 22 with higher protection behavior than concentrated nitric and sulfuric solutions, due to the growth of a much thicker and less defective films.

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“…There are some results indicating that the corrosion resistance can also be markedly improved by shot peening methods [43,44,46,54,55,93]. Jiang et al carried out corrosive immersion tests on sand blasted 35A commercially pure titanium specimens (treated with SiO2 particles of 200-300 µm in diameter and compressed air pressure of about 300 psi followed by a recovery treatment below 300 °C, for 30 min with subsequent air cooling).The results indicated that in the surface nano-crystalline layer, the high density of grain boundaries was beneficial to the formation of a thin passive film, which could restrict the movement of metal ions from metal surface to the solution, thus minimizing corrosion and improving polarization behavior of the sandblast-annealed titanium [46].…”

Section: Corrosionmentioning

confidence: 99%

Effects of surfaces nanocrystallization induced by shot peening on material properties : a Review

Fard¹,

Guagliano²

2009

Frattura Ed Integrità Strutturale

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RIASSUNTO.Si presenta una breve descrizione del processo di nanocristalizzazione delle superfici per mezzo di deformazioni plastiche severe. In particolare, si concentra l'attenzione sui processi di pallinatura che fino ad oggi si sono dimostrati efficaci per ottenere superfici nano strutturate e se ne descrive lo stato dell'arte. L'influenza del processo utilizzato sul comportamento del materiale in relazione alle differenti proprietà di interesse è, poi, analizzata criticamente. Infine, sulla base delle attuali conoscenze si tracciano e sottolineano alcuni possibili sviluppi di ricerca in questo settore. ABSTRACT.A brief description of surface nanosrystallization process via severe plastic deformation is presented. To come to the point different shot peening methods which have proved to be able to create nanocrystalline layers are demonstrated clarifying the actual state of the art. Then the influence of the process is reviewed on material behavior and a wide range of affected properties are investigated. On this basis some possible addresses for future research in this field are drawn and underlined.

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Improved corrosion resistance of Ni–22Cr–13Mo–4W Alloy by surface nanocrystallization

Cited by 56 publications

References 13 publications

The influence of nanocrystalline state of iron on the corrosion inhibitor behavior in aqueous solution

The influence of nanocrystalline state of iron on the corrosion inhibitor behavior in aqueous solution

Electrochemical Behavior of the Passive Films Formed on Alloy 22 (UNS N06022) in Acidic Solutions

Effects of surfaces nanocrystallization induced by shot peening on material properties : a Review

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