Abstract
The intergranular corrosion susceptibility of HR3 C steel aged at 600 ℃ was investigated by electrochemical double-loop potentiodynamic reactivation(EPR), scanning electron microscopy with energy dispersive spectroscopy. Experimental results show that intergranular corrosion occur due to the precipitation of M23C6 along grain boundaries, and the amount of precipitates play an important role. With the change of aging time, the morphology of M23C6 precipitates formed along grain boudaries and the precipitating rate of M23C6 varied accordingly. At the initial stage precipition of M23C6 along grain boundaries occured rapidly, which leads to the increase of intergranular corrosion susceptibility. With the increase of aging time, the amount of M23C6 precipitates increased steadily, resulting in a steady increase of intergranular corrosion susceptibility. It is found that the variation of intergranular corrosion susceptibility can be correlated with the amount of M23C6 precipitates.
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