Influence of microstructure on the resistance of tool steels to local corrosion in 3.5% NaCl medium

Scientific paper - Original scientific paper

• Author: Anita Begić Hadžipašić
• Author: Sandra Brajčinović
• Author: Marija Rajković
• Author's institution: University of Zagreb; Faculty of Metallurgy
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (english)

In this research, electrochemical and metallographic tests were carried out on tool steel for cold and hot work, as well
as steel for cementation, with the goal to obtain corrosion parameters to determine which of the examined samples is
more resistant to local pitting corrosion. Electrochemical tests were performed in a medium of 3.5% NaCl, and were
based on conducting cyclic anodic polarization in the potential range from -2000 mV to 200 mV vs SCE and vice versa.
The results of the research showed that all three samples are subject to pitting corrosion, but the worst was the cementing tool steel sample X19NiCrMo4, which had the lowest pitting potential. The W600 tool steel sample for hot work
proved to be the best, with the highest pitting potential.
The results of the electrochemical tests coincide with the metallographic tests, because after corrosion in the chloride
medium only the beginnings of pitting corrosion are visible on the surface of the W600 sample in the form of partial
accumulations of corrosion products, while the X19NiCrMo4 cementing steel sample was completely covered with
corrosion products, which means that of the three tested tool steels, cementing steel is the most susceptible to pitting
corrosion and is not recommended for use in conditions where it comes into contact with chloride ions. The martensitic
microstructure of cementing tool steel is responsible for the very low pitting potential and, consequently, pronounced
pitting corrosion. On the other hand, the W600 tool steel showed better corrosion resistance due to its finer grain and
uniform carbide distribution.

• Keywords (english): pitting corrosion; tool steels; cyclic anodic polarization; 3.5% NaCl; microstructure
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - domestic
• Publication version: Published version
• Journal title: Engineering Power : Bulletin of the Croatian Academy of Engineering
• Numbering: vol. 17, no. 3, pp. 19-27
• p-ISSN: 1331-7210
• URN:NBN: urn:nbn:hr:115:096503
• Publication: 2022
• Project: Number: KK.01.1.1.02.0020; Title (croatian): Centar za ljevarstvo - SIMET; Title (english): Center for casting - SIMET; Acronym: SIMET; Leader: Zdenka Zovko Brodarac; Jurisdiction: Croatia; Funding stream: European Regional Development Fund
• Project: Number: KK.01.1.1.02.0022; Title (croatian): Virtulab – Integrirani laboratorij za primarne i sekundarne sirovine; Acronym: Virtulab; Leader: Sibila Borojević Šoštarić; Jurisdiction: Croatia; Funding stream: European Regional Development Fund
• Document URL: https://hrcak.srce.hr/clanak/435996
• Type of resource: Text
• Access conditions: Open access
• Created on: 2024-04-29 10:59:51