Improving the Corrosion Behavior of Ductile Cast Iron in Sulphuric Acid by Heat Treatment

In this investigation, the effect of heat treatment on the corrosion behavior of ductile cast iron (DCI) in H₂SO₄ environment has been conducted. Moreover, the effect of heat treatment on the mechanical properties has also been investigated. The change in microstructure of DCI is obtained by austenetising at 900°C for two hours followed by oil quenching and then heated to 700ºC for different tempering times. The corrosion measurements were tested using anodic potentiodynamic polarization and cyclic polarization techniques. Here we show that the tempered specimens at different tempering times show better corrosion resistance in H₂SO₄ solution than that without heat treatment. Moreover, the polarization measurements showed that the E_corr and i_a of the different specimens increase with increasing H₂SO₄ concentration while both E_pass and i_pass were decreased.

Author(s): TFH Mohamed, SS Abd El Rehim and MAM Ibrahim*

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