Open AccessThe study on corrosion behavior and corrosion resistance of ultralow carbon high silicon iron-based alloy
Author(s) -
Yue Zhang,
Jun Xiao,
Yishun Zhang,
Wei Liu,
Wei Pei,
Aimin Zhang,
Wei Zhang,
Li Zeng
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abdc52
Subject(s) - corrosion , materials science , metallurgy , passivation , alloy , silicon , scanning electron microscope , optical microscope , ferrite (magnet) , carbon steel , composite material , layer (electronics)
The ultralow carbon high silicon iron-based alloy (sample A) with a single ferrite matrix was prepared. The corrosion performance difference and mechanism between it and conventional high silicon cast iron (sample B) were systematically studied using optical microscope, scanning electron microscope, electric corrosion equipment, electrochemical corrosion workshop and atomic force microscope. The results show that the corrosion rate of ultralow carbon iron-based alloys was significantly lower than that of high-silicon cast iron. For example, the static corrosion rate after 310 h, the corrosion rate of sample A was 0.2399 g/(m 2 · h), and the corrosion rate of sample B was 1.5159 g/(m 2 · h). The potential difference of the substrate was significantly reduced. That is, the ultralow carbon iron-based alloy exhibits better corrosion resistance, which is mainly attributed to the denser passivation film formed on its surface. The results of microhardness show that the hardness of Sample A was higher than that of Sample B.