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Comparative Study of Anti-Corrosion Properties of Different Types of Press-Hardened Steels

Authors :
Hao Peng
Yunlong Zhao
Wanwan Fu
Zhishan Chen
Man Zhang
Jiesheng Liu
Xiaoming Tan
Source :
Materials, Vol 17, Iss 5, p 1022 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Hot stamping (or press hardening) is a new technology that is widely used in the production of advanced high-strength steel parts for automotive applications. Electrochemical measurements, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), and accelerated corrosion tests (the neutral salt spray test and periodic immersion test) were conducted on press-hardened samples produced from uncoated (cold-rolled and cold strip production (CSP) hot-rolled) and Al–Si-coated press-hardened steels to elucidate their distinct anti-corrosion mechanisms. The cross-sectional micromorphology and element distribution of three types of press-hardened steels after a neutral salt spray test were observed using scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDAX). The corrosion resistance of Al–Si-coated press-hardened steel was found to be significantly diminished following the hot stamping process due to the presence of microcracks and elevated iron content in the coating subsequent to austenitizing heat treatment. On the other hand, the corrosion resistance of uncoated press-hardened sheets produced from cold-rolled and CSP hot-rolled press-hardened steel was found to be proximal due to their nearly identical composition and microstructure (fully martensite) after the hot stamping process. Considering the high efficiency and energy-saving properties of hot-rolled press-hardened steel, it holds the potential to replace cold-rolled and even aluminum–silicon-coated press-hardened steel in automobile manufacturing.

Details

Language :
English
ISSN :
19961944
Volume :
17
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.7aff0b56b99f4861907a9c3ef7581ded
Document Type :
article
Full Text :
https://doi.org/10.3390/ma17051022