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Published on: September 18, 2018
Effect of carbon addition on the passivity of hypoeutectic high chromium cast irons
Jun-Seob Lee1,2, Jun-Hyeong Lee2, Jun-Seok Oh1,3
1School of Materials Science and Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea junseoblee@changwon.ac.kr.
Abstract:
The effect of adding C on the passivity of hypoeutectic high chromium cast iron (HCCI) was investigated in a pH 8.4 boric-borate buffer solution. The microstructure of HCCI is composed of austenite and carbide phases, whose fractions and chemical compositions are influenced by the amount of C added. Electrochemical and surface analyses revealed that the addition of C in the HCCI increased the defect densities in the n-type and p-type semiconductive oxide layers on the austenite and carbide phases, respectively.
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