Critical pitting and repassivation temperatures for duplex stainless steel in chloride solutions

Deng, Bo; Jiang, Yiming; Gong, Jinlong; Zhong, Cheng; Gao, Juan; Li, Jin

doi:10.1016/j.electacta.2008.02.047

Cited by 140 publications

(75 citation statements)

References 16 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Influence of Mo addition on pit nucletion in the duplex structure Figure 5A and B show the pits formed on the etched surface of DIN 1.4362 and DIN 1.4462 after polarization experiments in pH 10 solution, respectively. This kind of pit was more occluded with a dimension of ≈ 2µm, which is consistent with the results found by (Deng et al, 2008). For the Free Mo duplex SS (Fig.…”

Section: Influence Of Mo Adition On Pitting Potential Of Stainless Stsupporting

confidence: 81%

Influence of Mo alloying on pitting corrosion of stainless steels used as concrete reinforcement

Mesquita¹,

Chauveau²,

Mantel³

et al. 2013

Rem: Rev. Esc. Minas

View full text Add to dashboard Cite

Corrosion of reinforcement steels, induced by chloride ions penetrating into the concrete, is the main cause of early damage, loss of serviceability and safety of reinforced concrete structures, which can be even more severe in the presence of concomitant concrete carbonation. In order to prevent reinforcement steel corrosion in highly aggressive alkaline environments, the use of stainless steels is becoming increasingly popular in coastal and marine constructions. Although widely used as an increasing corrosion resistance element in acidic environments, the influence of Mo addition on pitting corrosion resistance of stainless steels is not very clear in these conditions. Understanding Mo mechanism on corrosion resistance in alkaline media is hence of major importance, particularly for new lean grades with low Nickel and Molybdenum contents which presents a good balance between the properties required in these applications and the final cost of the material. In this work we will show the effect of Mo addition on pitting corrosion properties of austenitic, ferritic and duplex SS. A comparison between Mo content steels (alloys: 1.4404, 1.4113 and 1.4462) and very low molybdenum contents steels (alloys: 1.4301, 1.4016 and 1.4362) is done considering their pitting corrosion resistance (pitting potential E pit ) in different corrosion conditions. The results are discussed with respect to the influence of Mo addition on pitting behaviors for the different stainless steel rebar families in several aggressive media mainly in synthetic, chlorinated and carbonated solution reproducing the real concrete pore environments (pH10 solution with carbonates and chlorides ions). Keywords

show abstract

Section: Influence Of Mo Adition On Pitting Potential Of Stainless Stsupporting

confidence: 81%

Influence of Mo alloying on pitting corrosion of stainless steels used as concrete reinforcement

Mesquita¹,

Chauveau²,

Mantel³

et al. 2013

Rem: Rev. Esc. Minas

View full text Add to dashboard Cite

show abstract

“…This calculation would suggest a higher susceptibility of austenite, having lower PRE number, to initiate pitting corrosion than the ferrite phase at temperature above the CPT. The preferential pitting corrosion attack of the austenite phase at temperatures above the CPT has already been observed in other studies [32][33][34][35][36]. The lower amount of Cr and Mo in the austenite phase could be a reason of its higher susceptibility to pitting corrosion compared to the ferrite phase.…”

Section: Influence Of Temperature On the Corrosion Behavior Of 2205 Dssmentioning

confidence: 60%

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Bettini

Kivisäkk

Leygraf

et al. 2013

Electrochimica Acta

View full text Add to dashboard Cite

PostprintThis is the accepted version of a paper published in Electrochimica Acta. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Bettini, E., Kivisäkk, U., Leygraf, C., Pan, J. [Year unknown!] Study of corrosion behavior of a 22% Cr duplex stainless steel: influence of nano-sized chromium nitrides and exposure temperature. Electrochimica ActaAccess to the published version may require subscription. AbstractChromium nitrides may precipitate in duplex stainless steels during processing and their influence on the corrosion behavior is of great importance for the steel performance. In this study, the influence of nanosized quenched-in chromium nitrides on the corrosion behavior of a heat treated 2205 duplex stainless steel was investigated at room temperature and 50 °C (just above critical pitting temperature). The microstructure was characterized by SEM/EDS and AFM analyses, and quenched-in nitrides precipitated in the ferrite phase were identified by TEM analysis. Volta potential mapping at room temperature suggests lower relative nobility of the ferrite matrix. Electrochemical polarization and in-situ AFM measurements in 1 M NaCl solution at room temperature show a passive behavior of the steel despite the presence of the quenched-in nitrides in the ferrite phase, and preferential dissolution of ferrite phase occurred only at transpassive conditions. At 50 °C, selective dissolution of the austenite phase was observed, while the ferrite phase with the quenched-in nitrides remained to be stable. It can be concluded that the finely dispersed quenched-in nitrides do not cause localized corrosion, whereas the exposure temperature has a strong influence on the corrosion behavior of the duplex stainless steel.

show abstract

“…These results suggest that long period heat treatments decrease the passive Cr 2 O 3 layer formation capacity, since the chromium available for the passive layer formation precipitates in the form of Cr 23 C 6 , demonstrating that inappropriate heat treatment and/or aging time compromise the resistance to corrosion of this steel, mainly when the environment is rich in chlorides. This significative E c reduction, as steel heat treatment time increases occurs, first of all, due to the formation of the M 23 C 6 type carbide precipitates, which potentialize the corrosive attack on grain boundaries, as observed on the works of Ghosh et al [7] and Deng et al [18]. A preponderant factor which occurs on AISI 304 steel, when compared to AISI 316 steel, is the fact that AISI 304 steel does not present any molybdenum in its composition, different from AISI 316 steel, which has about 3-5 wt% molybdenum in its composition.…”

Section: Potentiodynamic Polarization In Nacl 35 Wt%mentioning

confidence: 66%

“…7, it can be noticed on the potential range close to +0.20 V that the sample as received has a slightly increasing of its current density. According to Deng et al [18], these are current transients, during the formation of metastable character pitting, where these metastable pitting are nothing more than the beginning of pitting formation on defective regions of the surface, having its origin on the adsorption of the electrolyte on steel surface.…”

Section: Potentiodynamic Polarization In Nacl 35 Wt%mentioning

confidence: 99%

Intergranular Corrosion of AISI 304 Heat Treated at 800 °C Varying Range Times

Viana¹,

Venturini²,

Souza³

2015

JCCE

View full text Add to dashboard Cite

Austenitic stainless steels, when exposed to welding conditions or aging for length of service, it's observed the formation of numerous deleterious phases, such as several kinds of carbides type MC, M 6 C, M 7 C 3 , M 23 C 6 , and intermetallic secondary phases (sigma, chi, laves), which cause the process of intergranular corrosion. The aim of this work was verifying the formation of the types of carbides and/or intermetallic phases existing in the stainless AISI 304 at 800 ºC, varying the timing of heat treatment between 30, 360 and 1,440 min. The optical microscopy analysis revealed the predominant formation of the carbide type M 23 C 6 . The results of DL-EPR (double loop electrochemical potentiokinetic reactivation) tests showed a gradual increase in the precipitation of this carbide with the increase of treatment time. The potentiodynamic polarization showed that the precipitation of this carbide reduce the formation of the Cr 2 O 3 passive layer, suggesting that the precipitate carbide to be predominantly of the Cr 23 C 6 type.

show abstract

Critical pitting and repassivation temperatures for duplex stainless steel in chloride solutions

Cited by 140 publications

References 16 publications

Influence of Mo alloying on pitting corrosion of stainless steels used as concrete reinforcement

Influence of Mo alloying on pitting corrosion of stainless steels used as concrete reinforcement

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Intergranular Corrosion of AISI 304 Heat Treated at 800 °C Varying Range Times

Contact Info

Product

Resources

About