Influence of medium on corrosion and microstructural properties of K110 tool steel for cold work

Scientific paper - Original scientific paper

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

Abstract (english)

This paper presents the results of testing the corrosion behaviour of K110 tool steel for cold work in industrial emulsion medium (Lenox Band- Ade semi-synthetic oil + water, in a ratio of 1:10), water and 3.5% NaCl medium. Using the method of electrochemical impedance spectroscopy (EIS) and Tafel extrapolation, electrochemical measurements were performed in order to determine the corrosion parameters. After polarization measurements, the surface of the sample was examined with an optical microscope. Tafel extrapolation of the polarization curves revealed that the tested tool steel showed the lowest corrosion rate in the Lenox Band-Ade emulsion medium and the highest in the medium of 3.5% NaCl. The obtained results were confirmed by the method of electrochemical impedance spectroscopy, where the lowest charge transfer resistance was registered in the 3.5% NaCl medium, which indicates the fact that the thinnest oxide layer was formed in tested medium, which has a very weak protective role in the corrosion process. Metallographic analysis of the sample surface after polarization measurements in 3.5% NaCl medium indicates the occurrence of pitting corrosion caused by the action of aggressive chloride ions from the solution, which caused the destruction an already weak passive layer on the metal surface. At the same time, chloride ions from the acid medium attack more aggressively the matrix of the metal base of the tool steel, in contrast to the precipitated carbides on the sample surface.

• Keywords (english): tool steel for cold work; corrosion rate; impedance; microstructure
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Publication title: METAL Conference Proeedings
• Numbering: pp. 816-821
• ISBN: 978-80-87294-97-0
• p-ISSN: 2694-9296
• DOI: https://doi.org/10.37904/metal.2020.3558
• URN:NBN: urn:nbn:hr:115:071264
• Publication: 2020
• 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
• Conference: Title: 29th International Conference on Metallurgy and Materials; Acronym: METAL 2020; Location: Brno, Czech Republic; Start date: 2020-05-20; End date: 2020-05-22; Assembly type: Lecture
• Document URL: https://www.confer.cz/metal/2020/3558-influence-of-medium-on-corrosion-and-microstructural-properties-of-k110-tool-steel-for-cold-work
• Type of resource: Text
• Publisher: TANGER Ltd.
• Publishing place: Brno, Czech Republic, EU
• Access conditions: Open access
• Created on: 2024-04-29 09:55:33