Revealing the relationship between grain size and corrosion rate of metals

Ralston, Kevin; Birbilis, Nick; Davies, Chris

doi:10.1016/j.scriptamat.2010.08.035

Cited by 872 publications

(301 citation statements)

References 17 publications

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“…An increase in grain size is detrimental to pitting corrosion resistance 20 . According to Ralston et al 21 , a metal that passivates in a given medium will be able to do so more easily when its grain size decreases, as an increase in surface area is conducive to passivation. This is certainly applicable to the present lean steel in 3.5 % NaCl.…”

Section: Influence Of ε and α' On Pitting Corrosion Resistancementioning

confidence: 99%

The Influences of Martensitic Transformations on Cavitation-Erosion Damage Initiation and Pitting Resistance of a Lean Austenitic Stainless Steel

Wang

Kwok

et al. 2016

Mat. Res.

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This paper looks into the influences of martensitic transformations on the cavitation-erosion (CE) damage initiation mechanism and pitting corrosion resistance of a lean austenitic stainless steel. The ε and α' martensites are prime sites of CE damage initiation for this steel, whereas grain boundaries are more favourable damage initiation sites for other similar steels. The profusion of ε and α' results in fast surface roughening during the CE process, which may cause a compromise in performance when this steel (or similar steels that have the same CE damage mechanism) is used for such applications as hydro-machinery or piping. ε and α' also detrimentally affect the pitting resistance of this steel and so they are expected to affect CE resistance adversely due to the synergism between CE and corrosion.

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Section: Influence Of ε and α' On Pitting Corrosion Resistancementioning

confidence: 99%

The Influences of Martensitic Transformations on Cavitation-Erosion Damage Initiation and Pitting Resistance of a Lean Austenitic Stainless Steel

Wang

Kwok

et al. 2016

Mat. Res.

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“…However, the presence of Mg 2 Ca phase, which is more active than the constituent elements, results in the formation of local galvanic cells and thus promotes the corrosion reaction (Figure 9). The location and distribution of these active corrosion sites (the Mg 2 Ca phase) is different for each microstructure and is associated with a specific mechanism of degradation [4,7,[14][15][16][17]. As shown schematically in Figure 9 for TA30 alloy, with its equiaxed grain microstructure and a uniform distribution of active sites, degradation begins when the corrosion reaction is initiated by the Mg 2 Ca phase.…”

Section: Microstructure-biodegradationcytocompatibility Relationshipmentioning

confidence: 99%

Towards microstructure-cytocompatibility relationship in ultralight Mg-4Li-1Ca (LX41) alloy for degradable implant applications

et al. 2016

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Cytocompatibility and biodegradation behaviour were investigated for a newly developed ultralight Mg-4Li-1Ca (LX41) alloy with different starting microstructures. This established the important role of microstructure in determining the pH variation, H 2 evolution and amount of ions (Mg, Li, Ca) released during degradation. Thus, different thermomechanical treatments were utilised to alter the microstructure of the alloy and to evaluate its bio-response. The as-cast and two step rolled+annealed (TA30) materials showed stronger X-ray diffraction peaks for Mg-and Li-containing hydroxyapatite (HA) than the two step rolled (TSR) and the equal channel angular pressed (ECAP) materials. It was also found that the as-cast and TA30 variants of LX41 showed good cell viability of more than 100% with preferential attachment and healthier cell morphology than the TSR material. This is associated with greater content of Mg and Li ions released during alloy degradation. These act as mediators to establish contact between the cells and the substrate, and thereby promote cell attachment and proliferation. These findings suggest the existence of a strong microstructure-cytocompatibility relation for the present LX41 alloy, which can be used as an important tool for further magnesium alloy development for biological applications.

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“…oxihidróxidos de tamaño nanométrico, los que crecen de manera más compacta, mejorando su adherencia y con ello la resistencia a la corrosión [12,13]. Los resultados experimentales muestran que las cantidades de goethita formada no son lo suficientemente relevante por ende su resistencia a la corrosión atmosférica con respecto a los aceros sin Ti tampoco lo es.…”

Section: Discucionesunclassified

Influencia de Ni y Ti en la respuesta a la corrosión marina simulada de un acero autopatinable A242

et al. 2015

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RESUMENExiste un gran interés en la industria siderúrgica por incorporar nuevos productos que superen las propiedades de los ya existentes. Dentro de estas propiedades, la resistencia a la corrosión es de gran importancia para los países que, al igual que Chile, tienen abundante litoral marino. En las zonas costeras los iones cloruro presentes en el aire producen deterioro por corrosión lo que disminuye la vida útil de las estructuras. Por esta razón es que es de vital importancia investigar la influencia de los distintos elementos aleantes y tratamientos que lleven a mejorar la resistencia de los aceros frente a la corrosión marina. Este trabajo apunta al estudio de aceros autopatinables ASTM A242 de baja aleación, específicamente con adición de Níquel a la aleación, y a la adición de Titanio como afinador de la microestructura, y su influencia sobre la resistencia a la corrosión atmosférica utilizando ensayos de corrosión acelerada producida en cámara de niebla salina con ciclos de humectación y secado. En las aleaciones estudiadas se determinó el espesor corroído de las muestras y la velocidad de corrosión. Los diferentes productos de corrosión, óxidos y oxihidróxidos de hierro se identificaron por rayos X. Los resultados muestran claramente que luego de 40 ciclos (960 horas) de tratamiento, en comparación con un acero ASTM A242, la velocidad de corrosión disminuye en forma significativa en el mismo acero con aleación de Níquel, y más aún con adición de Titanio como afinador de grano. Este resultado se ve también reflejado en una disminución del espesor corroído de los cupones, observándose el menor espesor corroído en el acero ASTM A242 con Ni y Ti.Palabras clave: corrosión acelerada, acero autopatinable, atmosfera marina. ABSTRACTThere is a great interest in the steel industry to incorporate new products in the market with better properties of those already in production. Among these properties, corrosion resistance is of great importance for countries with a large marine seacoast, like Chile, where chloride ions from sea spray produce corrosion, leading to irreversible failure of steel structures decreasing their life. For this reason, it is of vital importance to investigate the influence of various alloying elements and treatments for steels with superior corrosion resistance properties in marine environment. This work aims at studying the specific influence of Nickel -as an alloy constituent -and Titanium -as a microstructural tuner -on ASTM A242 low alloy weathering steel. For that, atmospheric corrosion resistance was evaluated through accelerated salt spray corrosion experiments under wet/dry cycles. For each alloy the thickness of corrosion products and corrosion rates

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Revealing the relationship between grain size and corrosion rate of metals

Cited by 872 publications

References 17 publications

The Influences of Martensitic Transformations on Cavitation-Erosion Damage Initiation and Pitting Resistance of a Lean Austenitic Stainless Steel

The Influences of Martensitic Transformations on Cavitation-Erosion Damage Initiation and Pitting Resistance of a Lean Austenitic Stainless Steel

Towards microstructure-cytocompatibility relationship in ultralight Mg-4Li-1Ca (LX41) alloy for degradable implant applications

Influencia de Ni y Ti en la respuesta a la corrosión marina simulada de un acero autopatinable A242

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