Breakaway corrosion, high-temperature

Breakaway Corrosion a sudden increase in corrosion rate, especially in high-temperature dry oxidation, etc. 

The corrosion kinetics observed by mild steels in high-temperature S-CO2 is sketched in Fig. 3.14. Their use is recommended only for temperatures below 350°C, above this temperature breakaway oxidation has been observed. 

Mrowec S, New generation of nanocrystaUine coating materials resistant to high temperature corrosion , High Temp Mater Proc, 2003, 22(1), 1-24 Peng X, Yan J, Zhou Y, Wang F, Effect of grain refinement on the resistance of 304 stainless steel to breakaway oxidation in wet air , Acta Mater, 2005, 53(19), 5079-... 

Laboratory oxidation-corrosion data indicate that extrapolation of short-term oxidation-corrosion data to yearly rates is difficult. These extrapolations are necessary to provide a basis for comparing oxidation-corrosion data obtained from variable CGA exposure times. Extrapolated data, particularly at high H2S concentrations in the CGA atmosphere, should be employed with caution. Long-term kinetics of the oxidation-corrosion process can result in transitions in corrosion behavior to high rates not predictable by short exposures. Similar behavior, breakaway oxidation, occurs in air primarily at temperatures above 2000 F. 

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