Oxidation by Oxygen of Liquid Al-Mg Alloys during Elaboration Process

Surla, Karine; Valdivieso, Françoise; Pijolat, Michèle; Soustelle, Michel; Prin, Marie-Agnès

doi:10.4028/www.scientific.net/msf.369-372.981

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…Except the initial decarburization stage, kinetics curves were completely linear, which proved that oxidation was controlled by a surface reaction. For better following oxidation alone, for times where decarburization may be considered as finished, we used a "break off" method [9,20]. It consisted in the sudden change of temperature or pressure of reaction after a pre-oxidation stage long enough to guarantee that initial decarburization had negligible effects.…”

Section: Oxidation Of Ironmentioning

confidence: 99%

C40E steel oxidation under CO2: Kinetics and reactional mechanism

Valette

Denoirjean

Tétard

et al. 2006

Journal of Alloys and Compounds

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Section: Oxidation Of Ironmentioning

confidence: 99%

C40E steel oxidation under CO2: Kinetics and reactional mechanism

Valette

Denoirjean

Tétard

et al. 2006

Journal of Alloys and Compounds

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“…(1). In the oxidation of metals or alloys the establishment of a steady state can be achieved when there is no accumulation of the intermediates of reaction at the interfaces or in the oxide layer, and also if the size of the reaction areas does not change very quickly during the reaction [18]. As far as we know, there has never been any attempt to test the validity of the approximation of the steady state in the oxidation of Zircaloy-4.…”

Section: Post-transitionmentioning

confidence: 99%

Differences in reactivity of oxide growth during the oxidation of Zircaloy-4 in water vapour before and after the kinetic transition

Tupin

Pijolat

Valdivieso

et al. 2003

Journal of Nuclear Materials

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International audienceThe oxidation of Zircaloy-4 by water vapour has been studied between 500 and 550 °C, the water vapour partial pressure ranging in 13-80 hPa, using isothermal and isobaric thermogravimetry, and calorimetry. During gravimetry experiments, sudden changes in temperature or water vapour pressure have also been performed. It results that the approximations of steady state and rate-limiting step are only valid before the kinetic transition. In the post-transition region, a significant influence of water vapour and hydrogen partial pressures has been found, contrarily to the kinetic behaviour before the transition (which is in this last case, in good agreement with a rate-limiting step of diffusion of oxygen vacancies). It comes out that the post-transition kinetic behaviour is definitely not the same as before the transition

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“…It can be verified by measuring the reaction rate with two techniques (for example, simultaneous thermogravimetry and calorimetry [24][25][26][27]): if the system proceeds in a pseudo-stationary state, the rates of weight gain and the heat flow should remain proportional during all the reaction, (ii) the assumption of a single rate-limiting step, and thus the validity of Eq. (5).…”

Section: Introductionmentioning

confidence: 99%

“…(5). This can be verified using a method based on jumps of temperature or pressure [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%