Effect of nitrogen contamination on intergranular corrosion of stabilized ferritic stainless steels

Gates, J.D.; Jago, R. A.

doi:10.1179/026708387790329685

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…8 illustrates schematically a new IGC mechanism operating in Ti-stabilized 11Cr FSS on the basis of TEM, EDS and 3DAP analysis. At first, the solution treatment at 1300 • C dissolves TiC carbides (not TiN which is stable even at this temperature [7]) in the matrix and the dissolution of TiC produce soluble carbon atoms as illustrated in Fig. 8(a).…”

Section: New Findings On Igc Mechanismmentioning

confidence: 98%

“…Recently, however, it was reported that automotive exhaust system made of Ti-stabilized 11 wt% Cr ferritic stainless steel (11Cr FSS) developed IGC due to the corrosive exhaust gas and condensed water with Cl − , SO 4 2− , SO 3 2− , CH 3 COOH, CO 3 2− and HCO 3− [6,7,9,15], although the contents of C, N and stabilizers in the materials meet the requirements of ASTM standard specification mentioned above.…”

Section: Introductionmentioning

confidence: 98%

“…IGC of stainless steels is known to be induced by electrochemical potential difference between the matrix and Cr-depleted zone which is developed by formation of Cr-carbide in the grain boundary area [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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New findings on intergranular corrosion mechanism of stabilized stainless steels

Kim

2011

Electrochimica Acta

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Section: New Findings On Igc Mechanismmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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New findings on intergranular corrosion mechanism of stabilized stainless steels

Kim

2011

Electrochimica Acta

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“…On the basis of the time-temperature-precipitation curve, carbide can precipitate in the range of 500–800 °C, depending upon the sensitization time and the alloying system [ 7 ]. The chromium carbide Cr 23 C 6 is the only precipitate that causes chromium depletion which is mainly responsible for the intergranular corrosion of 316L stainless steel [ 8 , 9 , 10 , 11 , 12 ]. Several mechanisms have been explored to explain the dynamics of sensitization, but the chromium depletion theory has been the only one that has been proven experimentally [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Nano-Crystal Surface Modification (UNSM) on the Passivation Behavior of Aged 316L Stainless Steel

2017

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Stainless steels have good corrosion resistance in many environments but welding or aging can decrease their resistance. This work focused on the effect of aging time and ultrasonic nano-crystal surface modification on the passivation behavior of 316L stainless steel. In the case of slightly sensitized 316L stainless steel, increasing the aging time drastically decreased the pitting potential, increased the passive current density, and decreased the resistance of the passive film, even though aging did not form chromium carbide and a chromium depletion zone. This behavior is due to the micro-galvanic corrosion between the matrix and carbon segregated area, and this shows the importance of carbon segregation in grain boundaries to the pitting corrosion resistance of stainless steel, in addition to the formation of the chromium depletion zone. UNSM (Ultrasonic Nano Crystal Surface Modification)-treatment to the slightly sensitized 316L stainless steel increased the pitting potential, decreased the passive current density, and increased the resistance of the passive film. However, in the case of heavily sensitized 316L stainless steel, UNSM-treatment decreased the pitting potential, increased the passive current density, and decreased the resistance of the passive film. This behavior is due to the dual effects of the UNSM-treatment. That is, the UNSM-treatment reduced the carbon segregation, regardless of whether the stainless steel 316L was slightly or heavily sensitized. However, since this treatment made mechanical flaws in the outer surface in the case of the heavily sensitized stainless steel, UNSM-treatment may eliminate chromium carbide, and this flaw can be a pitting initiation site, and therefore decrease the pitting corrosion resistance.

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“…Pitting corrosion resistance of the austenitic stainless steels 304L and 316L is widely studied [3,4], but there are only few works on the AISI 444 corrosion behaviour [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of pitting corrosion resistance of AISI 444 stainless steel to make it a possible substitute for AISI 304L and 316L in hot natural waters

Bellezze

Roventi

Quaranta

et al. 2008

Materials & Corrosion

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The pitting corrosion resistance of AISI 444, 304L and 316L stainless steels in two tap waters with different chloride concentrations at 80 8C was studied. Cyclic potentiodynamic polarization (CPP) tests were carried out starting from E corr À 30 mV until the current density reached 0.1 mA/cm 2 (scan rate 0.166 mV/s); the scan was then reversed and continued until new passivity conditions were achieved. The corrosion potential was measured before the polarization experiments. From the E-log i plots, the values of pitting and protection potential were obtained; from these potentials, the perfect and the imperfect passivity regions were defined to compare the corrosion resistance of the studied steels. CPP tests were performed both on as received stainless steel samples and on samples submitted to different cleaning-passivation treatments to improve their corrosion resistance. The results indicate that, for industrial production, AISI 444 stainless steel can substitute the more expensive AISI 304L or 316L after a cleaning-passivation treatment that reduces the presence of inclusions.

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Effect of nitrogen contamination on intergranular corrosion of stabilized ferritic stainless steels

Cited by 7 publications

References 7 publications

New findings on intergranular corrosion mechanism of stabilized stainless steels

New findings on intergranular corrosion mechanism of stabilized stainless steels

Effect of Ultrasonic Nano-Crystal Surface Modification (UNSM) on the Passivation Behavior of Aged 316L Stainless Steel

Improvement of pitting corrosion resistance of AISI 444 stainless steel to make it a possible substitute for AISI 304L and 316L in hot natural waters

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