Microstructure, heat treatment and pitting corrosion of 13CrNiMo plate and weld metals

Bilmes, Pablo David; Llorente, C.; Méndez, C. M.; Gervasi, C.A.

doi:10.1016/j.corsci.2009.01.018

Cited by 81 publications

(30 citation statements)

References 16 publications

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“…Two explanations are possible for the "leopard shape": 1) Carbides are more susceptible to corrosion initiation [27], [42] and therefore the passivation of the steel surface is locally destroyed where carbides precipitated. 2) In water saturated supercritical CO 2 at 100 bar and 60 °C the decreasing water solubility in the supercritical carbon dioxide [26] leads to wetting of the metal surface via very thin and small water droplets.…”

Section: A Kinetics Of Static Corrosion Experimentsmentioning

confidence: 99%

“…Alloying elements [22] as well as heat treatment (temperature and time of austenitisizing, cooling rate as well as temperature and time of annealing [23]- [25]) shows significant influence upon the corrosion resistance of steels, e.g. high Ni-and Cr contents [26], [27] improve general corrosion resistance as well as retained austenite improves pitting corrosion resistance [26]. Higher austenitizing temperature of martensitic steels [28]- [30] as well as higher annealing temperature of lean duplex stainless steels [22], [23], [28] decrease the pitting potential.…”

Section: Introductionmentioning

confidence: 99%

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Potential of Martensitic Stainless Steel X5CrNiCuNb 16-4 as Pipe Steel in Corrosive CCS Environment

Pfennig¹,

Kranzmann²

2017

IJESD

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Abstract-Pipe steels suitable for carbon capture and storage technology (CCS) require resistance against the corrosive environment of a potential CCS-site (heat, pressure, salinity of the aquifer, CO 2 -partial pressure). X5CrNiCuNb16-4 has been proven to be sufficient resistant in corrosive environments, but shows rather unusual corrosion behaviour in CCS environment. Therefore differently heat treated coupons of 1.4542 were kept at T=60 °C and ambient pressure as well as p=100 bar for 700 h -8000 h in an a) water saturated supercritical CO 2 and b) CO 2 -saturated synthetic aquifer environment similar to on-shore CCS-sites in the Northern German Basin. Additionally fatigue tests were performed via push-pull tests with a series of 30 specimens was tested at stress amplitudes between 150 MPa and 500 MPa (sinusoidal dynamic test loads, R=-1; resonant frequency ~ 30 Hz). Best corrosion resistance in the liquid phase is achieved via normalizing prior to exposure and hardening+tempering at 670 °C leads to lowest corrosion rates in the supercritical phase. With no regard to atmosphere discontinuously ellipsoidal surface corrosion regions appear after exposure of 4000 h and more. The endurance limit of X5CrNiCuNb16-4 measured in air is reduced by more than 50% when exposed to CCS environment (maximum number of cycles (10 x 10 6 ) at a stress amplitude of 150 MPa) The scatter range TN = 1:34 is disproportionately large contributing to an overall unusual corrosion behaviour Index Terms-Corrosion, CCS, carbon storage, aquifer, heat treatment, fatigue, endurance limit.

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Section: A Kinetics Of Static Corrosion Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential of Martensitic Stainless Steel X5CrNiCuNb 16-4 as Pipe Steel in Corrosive CCS Environment

Pfennig¹,

Kranzmann²

2017

IJESD

View full text Add to dashboard Cite

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“…Moreover, stability of the passive layer affects the development of localized corrosion processes significantly [5]. For low-C 13CrNiMo stainless steels, a direct correlation was found between pitting susceptibility and volume fraction of retained austenite [6,7]. A larger amount of retained austenite prevents formation of chromium precipitates preserving higher chromium contents in solid solution and determining a lower pitting susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Chemical composition and electronic structure of anodic passive films on low-C 13CrNiMo stainless steel

Gervasi

Méndez

Bolzán

et al. 2015

J Solid State Electrochem

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Mott-Schottky analysis and electrochemical and X-ray photoelectron spectroscopy (XPS) measurements were performed on passive films formed on low-C 13CrNiMo stainless steel with different applied heat treatments. Heat treatments render particular microstructural features of the alloy with a significant impact on the ability of the passive films to afford adequate protection against localized corrosion. A lower level of retained austenite in the substrate renders thinner passive films. Phosphates coexist with oxidized Fe(III) compounds as the prevailing species in the anodic layers. Mo was only detected in the oxide film formed on the sample with a higher retained austenite content.Passive layers behave as n-type semiconductors with two types of donors, namely, shallow-level and deep-level states. The observed flat band potential V FB ≅ -0.425 ± 0.005 V vs. standard calomel electrode (SCE) is independent of the thermal treatment of the alloy but under potential bias conditions at the corrosion potential the occurrence of the cathodic reaction on the oxide surface is hindered on the sample with higher retained austenite in its microstructure as compared to the sample with lower retained austenite content.

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“…Por otro lado se sabe que la composición de los aceros inoxidables influye en la macro y microestructura del material, en la formación de inclusiones, y fases secundarias, que a su vez puede dar características particulares a la película pasiva que se forma sobre ellas [2][3][4][5]. La película pasiva formada sobre los aceros inoxidables posee propiedades semiconductoras y está relacionada con múltiples factores que la hacen de importancia para la comprensión de los fenómenos de corrosión.…”

Section: Introductionunclassified

Pasividad en solución de fosfato de aceros inoxidables solidificados unidireccionalmente

et al. 2015

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RESUMENLa pasividad de los aceros inoxidables es atribuida a la formación de una película protectora, conformada por óxidos, sobre la superficie del metal. Esta película posee propiedades semiconductoras y está relacionada con múltiples factores que la hacen de importancia para la comprensión de los fenómenos de corrosión. En este trabajo se estudia la película pasiva formada en aceros inoxidables solidificados unidireccionalmente, Fe18Cr-10Ni-2Mo-0,08C (muestra A), Fe-18Cr-14Ni-8Mo-0,03C (muestra C) y Fe-18Cr-10Ni-8Mo-0,08C (muestra F), para determinar la influencia de la variación de la estructura (equiaxial, columnar y con transición de columnar a equiaxial-TCE) en la resistencia a la corrosión, así como investigar la relación entre la resistencia a la corrosión y el espaciamiento dendrítico secundario del material. Para ello se emplean técnicas potenciodinámicas y galvanostáticas, análisis de MottSchottky y espectroscopía de impedancia electroquímica que se realizaron en solución de Na 2 HPO 4 0,5 M (pH 9,2).Las curvas potenciodinámicas indican una región pasiva y un máximo de corriente en la región transpasiva. Las medidas galvanostáticas realizadas sobre películas pasivas formadas previamente indican dos amesetamientos de potencial, debido al óxido de Cr y óxido de Fe, del cual surgen dos tiempos de transición. El mayor espesor de óxido de hierro se encuentra en las estructuras equiaxial de la muestra F, que posee el menor espaciamiento dendrítico respecto de los otras dos muestras teniendo en cuenta la misma estructura. El análisis de Mott Schottky muestra que la película pasiva se comporta como un semiconductor tipo n en el rango de potenciales de -0,45 V a 0 V, con una densidad de donores que varía de acuerdo a la composición del acero inoxidable. También se observa que la densidad de donores varía de acuerdo al tipo de estructura para un mismo material.Palabras Clave: aceros inoxidables, película pasiva, Mott Schottky, resistencia a la corrosión. ABSTRACTPassivity of the stainless steel is attributed to the development of a protector film, formed by oxides on the metal surface. This film has semiconductor properties, and it is important for the understanding of corrosion phenomena.The objective of this work is to study the passive films formed in stainless steels samples solidified unidirectionally. The composition of the alloying elements in the samples are Fe-18Cr-10Ni-2Mo-0,08C (sample A), Fe-18Cr-14Ni-8Mo-0,03C (sample C) y Fe-18Cr-10Ni-8Mo-0,08C (sample F), and determine the influence of the structure (equiaxed, columnar and columnar-to-equiaxed transition, CET) in the corrosion resistance, as well as investigate the relationship between the corrosion resistance and the size of the secondary dendritic arm spacing. For this are used potentiodynamic and galvanostatic techniques, Mott Schottky analysis and electrochemical impedance spectroscopy.The measurements were performed in Na 2 HPO 4 0,5 M (pH = 9,2), at room temperature (25ºC).Potentiodynamic measurements indicate a passive region and a maximu...

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Microstructure, heat treatment and pitting corrosion of 13CrNiMo plate and weld metals

Cited by 81 publications

References 16 publications

Potential of Martensitic Stainless Steel X5CrNiCuNb 16-4 as Pipe Steel in Corrosive CCS Environment

Potential of Martensitic Stainless Steel X5CrNiCuNb 16-4 as Pipe Steel in Corrosive CCS Environment

Chemical composition and electronic structure of anodic passive films on low-C 13CrNiMo stainless steel

Pasividad en solución de fosfato de aceros inoxidables solidificados unidireccionalmente

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