Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

Lacerda, José Carlos de; Freitas, Lucas L. de; Brito, Rogério Fernandes; Filho, Francisco Moura; Teixeira, Ricardo Luiz Perez

doi:10.1590/1980-5373-mr-2020-0408

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…The precipitation of chromium carbides in critical temperatures consumes chromium from a narrow band along the grain boundary and this makes the zone anodic to the unaffected grains. The chromium content drop under the passivity limit (11.5 wt %) near the grain boundaries leads to the sensitization of this material, which becomes susceptible to intergranular corrosion in aggressive environments [ 8 , 9 , 10 , 11 , 12 ]. Moreover, chromium depleted zones perform the preferential path for other local corrosion attacks and for crack propagation if under tensile stress [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Sensitized AISI 304 Stainless Steel in Acid Chloride Solution

et al. 2022

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Corrosion resistance of sensitized austenitic stainless steel (SS) in chloride environments is currently the subject of numerous studies. Most of them are focused on neutral chloride solutions at room temperature and the experiments are carried out on ground stainless steels surfaces. This paper deals with the corrosion behavior of sensitized AISI 304 stainless steel in acid 1 M chloride solution (pH = 1.1) at the temperatures of 20 ± 3 °C and 50 °C. The specimens after sensitization are tested as covered by high-temperature surface oxides (“heat tinted”), and also after their chemical removal to assess the impact of the surface state on corrosion resistance. Potentiodynamic polarization (PP) and exposure immersion test are used as the independent corrosion tests. Microstructure before/after exposure immersion test is evaluated by optical microscopy (OM) and SEM. The results obtained showed that sensitization significantly conditions corrosion regardless of the removal of high-temperature oxides, and the elevated temperature mainly acts as its accelerating factor.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Sensitized AISI 304 Stainless Steel in Acid Chloride Solution

et al. 2022

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“…This material is also recommended as a biomaterial due to its low carbon content, which increases its corrosion resistance to chlorinated environments [3,4]. The passive protective layer on the surface of SS material provides high prevention against uniform corrosion in ordinary oxidizing environments but can induce localized forms of corrosion under special conditions [5][6][7]. The existence of corrosive substances can lead to local passivation degradation and dangerous pitting [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects of immersion in the NaCl and H2SO4 solutions on the corrosion rate, microstructure, and hardness of stainless steel 316L

Wicaksono,

Sutanto,

Ruslan

2023

Res. Eng. Struct. Mater.

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Stainless steel is one of the materials with excellent corrosion resistance, so it is widely applied in various fields such as the chemical industry, aerospace, power generation, and biomedicine. The environmental condition (neutral, acidic, salty, or basic) is the most important thing to be considered prior to choosing palpable stainless steel materials. In this study, the corrosion behaviors of stainless-steel type SS 316L under exposure immersions in salty and acidic environments using sodium chloride (NaCl) and sulfuric acid (H2SO4) solutions were investigated, by referring to a standard method of ASTM G31-72. Scanning electron microscopy (SEM) results revealed that the specimen in NaCl solution exhibited a darker color, and relatively similar shape of cracks are observed. In contrast, the specimen immersed in H2SO4 was observed to have a large diagonal crack. The corrosion rate of SS 316L immersed in NaCl was lower with a value of 0.4260 mpy, compared to that of H2SO4 which was 2.5141 mpy. The Vickers hardness test showed that the hardness value of NaCl immersion was higher than that of H2SO4, which was 6.34% and 1.94%, respectively. It can be concluded that the SS 316L is better used in a salty environment compared to acidic conditions, because the main function of SS 316L is to be able to withstand rust, one of which is caused by chloride compared to other types of stainless-steel.

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“…The precipitation of Cr 23 C 6 and the slow diffusion of Cr in the austenite crystal mean that Cr is not replenished sufficiently quickly, resulting in Cr depletion at the grain boundary. Intergranular corrosion then occurs due to the formation of corrosion cells between grains in Cr-depleted regions that are prone to corrosion [20].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviors of Fe-22Cr-16Mn-0.55N High-Nitrogen Austenitic Stainless Steel in 3.5% NaCl Solution

Gao

Han

et al. 2022

Coatings

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In this study, the corrosion behavior of the high-nitrogen austenitic stainless steel (HNS) Fe-22Cr-16Mn-0.55N before and after solution treatment (ST) in 3.5% NaCl solution has been investigated. The effect of a solution temperature of 1100 °C and heat preservation for 30 min on the corrosion resistance and passive film protection of HNS steel was studied. Open-circuit potential, potentiodynamic polarization and electrochemical impedance tests were used to assess the corrosion resistance of treated and untreated steels. In addition, potentiostatic polarization and XPS techniques together with Mott–Schottky curves were applied to determine the composition and properties of the passive films. The results showed that after solution treatment, the grain size of HNS decreased and the grain became more uniform. Although corrosion occurred on HNSs both before and after treatment, solution treatment resulted in greater compactness in passive films, leading to lower carrier density, lower corrosion current density and better corrosion resistance.

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Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

Cited by 4 publications

References 17 publications

Corrosion Behavior of Sensitized AISI 304 Stainless Steel in Acid Chloride Solution

Corrosion Behavior of Sensitized AISI 304 Stainless Steel in Acid Chloride Solution

Effects of immersion in the NaCl and H2SO4 solutions on the corrosion rate, microstructure, and hardness of stainless steel 316L

Corrosion Behaviors of Fe-22Cr-16Mn-0.55N High-Nitrogen Austenitic Stainless Steel in 3.5% NaCl Solution

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