Oxidation of AISI 304 and AISI 439 stainless steels

Thermodynamic and Kinetics Aspects of High Temperature Oxidation on a 304L Stainless Steel

“…The fit is good, in particular at the beginning of oxidation, where a simple parabolic trend failed to reproduce the experimental curves (figure 1b). In this way, it is possible to Obtained results are in good agreement with parabolic rate constant obtained for an AISI 304L steel in the same temperature range and in similar oxidation atmosphere [1]. The values of k p and k l increase as a function of temperature, as expected.…”

“…The lack of a single rate constant during oxidation of AISI 304L has been already observed [1,17] and two separate parabolic rate constant have been considered. They have been associated to the formation of chromia and haematite or magnetite oxide phases, separated by a transient stage where a codevelopment of different oxide phases is occurring.…”

“…3, the apparent activation energies are 96 ± 19 kJ mol -1 for the linear part of the oxidation, and 138 ± 12 kJ mol -1 for the parabolic one. The activation energy for oxidation in AISI 304L seems to be strongly influenced by the atmosphere, ranging from 150 up to 323 kJ mol -1 [1].…”

“…The values of the parabolic constant for the growth of single oxides can be calculated from the equation obtained by Hindam and Whittle [1,22]:…”

“…Using the values of the oxygen partial pressure from the work of Huntz et al [1], and the diffusion coefficients from the work of Tsai et al [23], it is possible to calculate the values of k s for Cr 2 O 3 , 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64Fe 2 O 3 and M 3 O 4 at 1050 °C. Finally, using eq.…”