The conditions for the transition from internal to external oxidation of the most-reactive component C of ternary A-B-C alloys are examined, assuming the presence of external scales of the oxide of the component of intermediate reactivity B. For this, approximate expressions for the diffusion coefficient of oxygen and for the concentration of oxygen dissolved in the binary A-B alloy matrix within the zone of internal oxidation as,functions of the composition of the metal matrix within the zone of internal oxidation are used. Numerical calculations of the critical content of C needed for this transition are carried out for different combinations of values of the various parameters involved. The results obtained for the ternary alloys are compared with the corresponding data calculated for the binary A-C and B-C alloys under oxygen pressures insufficient to oxidize the most-noble alloy component. This allows to predict the possibility of existence of a third-element effect under intermediate oxidant pressures.
部门归属
chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. univ genoa, dichep, i-16129 genoa, italy.;niu, y (reprint author), chinese acad sci, inst met res, state key lab corros & protect, wencui rd 62, shenyang 110016, peoples r china;yniu@imr.ac.cn
Y. Niu,F. Gesmundo. The internal oxidation of ternary alloys. VI: The transition from internal to external oxidation of the most-reactive component under intermediate oxidant pressures[J]. Oxidation of Metals,2004,62(5-6):391-410.
APA
Y. Niu,&F. Gesmundo.(2004).The internal oxidation of ternary alloys. VI: The transition from internal to external oxidation of the most-reactive component under intermediate oxidant pressures.Oxidation of Metals,62(5-6),391-410.
MLA
Y. Niu,et al."The internal oxidation of ternary alloys. VI: The transition from internal to external oxidation of the most-reactive component under intermediate oxidant pressures".Oxidation of Metals 62.5-6(2004):391-410.
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