Effect of nitrogen on corrosion behavior of 28Cr–7Ni duplex and microduplex stainless steels in air-saturated 3.5 wt% NaCl solution

Lothongkum, Gobboon; Wongpanya, Pornwasa; Morito, Shigekazu; Maki, Tadashi

doi:10.1016/j.corsci.2004.11.017

Cited by 108 publications

(44 citation statements)

References 14 publications

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“…The use of N 2 as a shielding gas to substitute argon, below similarly stream situation, has also resulted in an exceptional reduction in corrosion speed of connecting pieces. This finding is supported by Srinivasan [91] and Lothongkum [92] and advances the corrosion characteristics of laser joint parts manufactured with nitrogen as a shielding gas relevant to improve the ferrite-austenite ratio in weld metal WM and HAZ. The corrosion morphology of grains around precipitates and the precipitate-free zone were left intact and clarified on the substructure of the chromium exhaustion around the Cr 2 N precipitates in ferrite.…”

Section: Pitting Corrosionmentioning

confidence: 85%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

101

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Abstract:The effects of input heat of different welding processes on the microstructure, corrosion, and mechanical characteristics of welded duplex stainless steel (DSS) are reviewed. Austenitic stainless steel (ASS) is welded using low-heat inputs. However, owing to differences in the physical metallurgy between ASS and DSS, low-heat inputs should be avoided for DSS. This review highlights the differences in solidification mode and transformation characteristics between ASS and DSS with regard to the heat input in welding processes. Specifically, many studies about the effects of heat energy input in welding process on the pitting corrosion, intergranular stress, stress-corrosion cracking, and mechanical properties of weldments of DSS are reviewed.

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Section: Pitting Corrosionmentioning

confidence: 85%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

101

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“…9 Lothongkum et al investigated the effect of N on the corrosion behavior of 28Cr-7Ni duplex stainless steels in an air-saturated 3.5 wt% NaCl solution at pH 2, 7 and 10. 6 They demonstrated that at pH 2, the corrosion potential (E corr ) increased and the passive current density (i pass ) and corrosion current density (i corr ) decreased with the increase in the N content. At pH 7 and 10, the effect of N on E corr and i corr could not be observed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to Fe, Cr and Ni, they contain other chemical elements classified as either ferrite (Cr, Mo, Si) or austenite (Ni, N, C, Mn, Cu) stabilizers. [5][6][7][8] The advantage of the duplex alloys in media that contain chloride resides in the content of delta ferrite, which promotes combined effects due to electrochemical and mechanical factors. The relationship between both phases is usually about 50% (per volume), although it can range from 30% to 60% according to international standards, and considering variations in both chemical composition and heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ferrite Phase Content on the Electrochemical Properties of Duplex Stainless Steels

Souza

Rossitti²,

Fortulan

et al. 2016

Mat. Res.

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Duplex stainless steels have a large number of industrial applications and may replace high cost materials, especially in chloride-containing environments like seawater in off-shore platforms due to their high mechanical properties and good corrosion resistance. The influence of the ferrite content on the performance of duplex stainless steels in these corrosive environments is not well known. For the present paper, new superduplex stainless steels with ferrite between 30 and 60% were developed and their microstructure and corrosion resistance were evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests in NaCl 3.5% (wt %) at 26°C and 78°C. The results obtained at 26°C showed that the pitting potential (E pitt ) is little affected by the ferrite content, but for the materials with higher ferrite it was possible to observe an increase in the repassivation potential with a decrease in the corrosion potential and passive currents due to the presence of more resistive passive films. Tests performed at 78°C indicated a high decrease in the E pitt for all the samples, independently of the ferrite percentage, although maintaining superiority in higher ferrite content. Alloys with a 55% ferrite phase content, i.e. less dependent of Ni element, present a superior performance of corrosion resistance.

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“…The optimization of wrought and cast duplex SS has resulted in continuous material development related to their alloying, especially with nitrogen and the resulting mechanical, corrosion and wear properties as well as weldability [19][20][21][22]. PM is one of the more interesting methods for intentionally raised nitrogen content.…”

Section: Introductionmentioning

confidence: 99%

Effect of ageing heat treatments on the microstructure and intergranular corrosion of powder metallurgy duplex stainless steels

et al. 2010

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a b s t r a c tThe influence of ageing heat treatments (675 and 875°C for 1.5 to 48 h) on the microstructure and intergranular corrosion resistance of sintered in nitrogen duplex stainless steels was investigated. The materials were obtained by sintering mixtures of austenitic AISI 316L and ferritic AISI 430L powders. Corrosion behaviour was evaluated by using electrochemical techniques. The beneficial effect of nitrogen on corrosion behaviour of solution annealed samples was established. During ageing, secondary phases were precipitated and the intergranular and transgranular corrosion resistance significantly decreased though repassivation was observed in specimens aged at 875°C for times up to 8 h.

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Effect of nitrogen on corrosion behavior of 28Cr–7Ni duplex and microduplex stainless steels in air-saturated 3.5 wt% NaCl solution

Cited by 108 publications

References 14 publications

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Influence of Ferrite Phase Content on the Electrochemical Properties of Duplex Stainless Steels

Effect of ageing heat treatments on the microstructure and intergranular corrosion of powder metallurgy duplex stainless steels

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