Effect of carbon addition on the passivity of hypoeutectic high chromium cast irons

Jun-Seob Lee; Jun-Hyeong Lee; Jun-Seok Oh; Sung Kang; Seung-Hoon Baek; Jee Hyuk Ahn; Seung Zeon Han; Je-Hyun Lee

doi:10.1039/d2ra06902d

Effect of carbon addition on the passivity of hypoeutectic high chromium cast irons

RSC Adv. 2022 Dec 22;13(1):586-593. doi: 10.1039/d2ra06902d. eCollection 2022 Dec 19.

Authors

Jun-Seob Lee^{1

2}, Jun-Hyeong Lee², Jun-Seok Oh^{1

3}, Sung Kang⁴, Seung-Hoon Baek⁴, Jee Hyuk Ahn⁵, Seung Zeon Han⁵, Je-Hyun Lee^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea junseoblee@changwon.ac.kr.
² Department of Materials Convergence and System Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea.
³ i-Casting Tech Ltd. Gomo-ro Gimhae 50875 South Korea.
⁴ Research Institute of Industry Science & Technology Cheongam-ro Pohang 37673 South Korea.
⁵ Korea Institute of Materials Science Chagwondea-ro Changwon 51508 South Korea.

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.