Influence of the cold working induced martensite on the electrochemical behavior of AISI 304 stainless steel surfaces

Monrrabal, Gleidys; Bautista, A.; Guzmán, S.; Gutierrez, Cristina; Velasco, F.

doi:10.1016/j.jmrt.2018.10.004

Cited by 59 publications

(17 citation statements)

References 58 publications

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“…The hardness profiles of each sample permit to classify the near surface hardness of the sample as follow: h P < h SP < h M < h S . For austenitic steels, the plastic deformation could lead to martensite formation [34][35][36][37]. This point was not verified here.…”

Section: Impacts Of Surface Finishes On the Oxide Scale Formed Duringmentioning

confidence: 67%

Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

et al. 2019

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The oxidation of 316 L stainless steel in hydrogenated supercritical water at 600°C is strongly dependent on the effects of work hardening induced by surface finishes. The oxide scale formed under these conditions is always double-layered with an external layer of Fe-rich oxides. However, when a hardening threshold is reached, a switch in oxidation mechanisms leads to a considerable thinning of the oxide scale. This thinning results from the formation of a Cr-rich internal oxide layer that acts as a diffusion barrier against ionic species responsible for its growth but also against Fe cations implied in the external layer growth.

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Section: Impacts Of Surface Finishes On the Oxide Scale Formed Duringmentioning

confidence: 67%

Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

et al. 2019

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“…Hence, the relative corrosion resistance of austenite and ferrite reversed in the most strained regions of the surface of the bars. In the pits formed in very strained regions, the ferrite corroded selectively, while the austenite (partially transformed into strain-induced martensite [46]) remained uncorroded (Figure 12b). The selective dissolution of ferrite has already been reported for high-strength lean duplex bars (i.e., high-strained) when they were tested in simulated pore solutions [18].…”

Section: Resultsmentioning

confidence: 99%

Influence of the Alkaline Reserve of Chloride-Contaminated Mortars on the 6-Year Corrosion Behavior of Corrugated UNS S32304 and S32001 Stainless Steels

Bautista

Velasco

Torres-Carrasco

2019

Metals

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The durability of two lean corrugated duplex stainless steel (UNS S32304 and S32001) bars manufactured for concrete reinforcement was studied in four different corrosive conditions. These duplex stainless steels are more economical than the most traditional, well-known duplex grade steels (UNS S32205). The research was carried out in mortar samples for six years. In half of the samples, the alkaline reserve had been previously decreased, and their pH was slightly below 12, while in the other half, the pH close to the bars remained as-manufactured. Moreover, there were samples with modified and non-modified alkaline reserve where chlorides had been previously added to the mortar which were exposed to high relative humidity. In other samples—which were partially immersed in 3.5% NaCl—the chlorides entered through the mortar by natural diffusion. The electrochemical behavior of the reinforcements in these conditions was periodically monitored through corrosion potential (Ecorr) and electrochemical impedance spectroscopy (EIS) measurements during the whole testing period. The samples were anodically polarized at the end of the exposure. The results prove that the decrease in the alkaline reserve of the mortars can affect the corrosion behavior of the studied lean duplex in environments with high chloride concentrations. The duplex microstructure of the reinforcements makes it so that the corrosion proceeds by selective attack of the phases.

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“…Optoelectronic microscopy is a technique that has recently been used to characterize the morphology of pits and evaluate its dangerousness in other materials [29].…”

Section: Polarization Curves and Electrochemical Impedance Spectroscomentioning

confidence: 99%

Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides

Bautista

Pomares

González

et al. 2019

Construction and Building Materials

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Thermomechanically treated (TMT) carbon steel bars, often known as "TempCore" bars, are commonly used as reinforcements in concrete structures. TMT causes the formation of a martensite case in the outer surface of the bars, increasing their hardness, while the remaining ferritic-perlitic core maintains the typical ductility of hot rolled bars. In this work, the effect of this TMT induced microstructure on the development of pitting attacks in chloride media has been analyzed in depth. Electrochemical impedance spectroscopy (EIS) measurements and polarization curves have been carried out in simulated pore solutions to understand the effect of the presence of different phases in the microstructure and to quantify the strength of the galvanic couple that the outer martensite can form with the inner core. Moreover, accelerated corrosion tests in chloride contaminated concrete slabs have also been performed. Bars from six different slabs where corrosive attack has been forced for different times have been studied. The shape of the main pits in the bars corroded in concrete has been analyzed through optoelectronic microscopy and the results obtained prove that the depth of the attack is related to the microstructure of the TMT bars.

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Influence of the cold working induced martensite on the electrochemical behavior of AISI 304 stainless steel surfaces

Cited by 59 publications

References 58 publications

Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

Influence of the Alkaline Reserve of Chloride-Contaminated Mortars on the 6-Year Corrosion Behavior of Corrugated UNS S32304 and S32001 Stainless Steels

Influence of the microstructure of TMT reinforcing bars on their corrosion behavior in concrete with chlorides

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