Abstract
Rust on 1020 steel, caused by methanol combustion products, was studied with a pulse flame combustor. Rust formation is triggered by formic acid in the exhaust which produces ferrous formate. The formate, in turn, reacts with liquid water and oxygen from the gas phase to produce FeOOH and Fe 3O 4. Rust formation decreases sharply when the steel temperature is raised above the dew point at which moisture condenses from the exhaust gas. Rust formed on a steel surface after exposure to formic acid vapor and liquid water is comparable in structure to that produced by burnt methanol.
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