Inhibitory Effect of Commercial Inhibitor VCI 379/611 on the Corrosion Behaviour of HTCS-130 Tool Steel for Hot Work

Scientific paper - Original scientific paper

• Author: Sandra Brajčinović
• Author: Anita Begić Hadžipašić
• Author: Jožef Medved
• Author's institution: University of Zagreb; Faculty of Metallurgy; (Department of Process Metallurgy); (Laboratory of chemistry (basic, inorganic, physical))
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (english)

This paper presents the results of a study of the influence of water and the commercial
inhibitor VCI 379/611 on the corrosion behaviour of HTCS-130 hot work tool steel. Using the
thermodynamic program Thermo-Calc, phase equilibria were determined according to the choice
of calculation conditions and the known chemical composition of tool steels. From the obtained
projections, it is possible to observe the secretion of individual phases at certain temperatures. To
obtain insight into the corrosion resistance of steel, the following electrochemical methods were
used: open circuit potential measurement; electrochemical impedance spectroscopy; and Tafel
extrapolation. Metallographic tests were performed on a sample previously etched in nital to identify
the microstructure of the steel. Using an optical microscope, the sample surface was analysed after
each measurement. Images of the sample surface subjected to water without inhibitors indicate the
occurrence of pitting corrosion. The presence of tungsten and molybdenum carbides was identified
by scanning electron microscopy and energy dispersion spectroscopy. It was found that the corrosion
process is more pronounced in the area of the metal base while in the areas of excreted carbides,
weaker corrosion activity was observed.

• Keywords (english): hot work tool steel; electrochemical techniques; corrosion parameters; microstructure; phase equilibria
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Metals
• Numbering: vol. 12, no. 6, pp. 1-13, 966
• p-ISSN: 2075-4701
• DOI: https://doi.org/10.3390/met12060966
• URN:NBN: urn:nbn:hr:115:253059
• Publication: 2022-06-04
• Project: Number: KK.01.1.1.02.0020; Title (croatian): Centar za ljevarstvo - SIMET; Title (english): Center for Foundry Technology - SIMET; Acronym: SIMET; Leader: Zdenka Zovko Brodarac; Jurisdiction: Croatia; Funding stream: EFRR
• 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: EFRR
• Document URL: https://www.mdpi.com/2075-4701/12/6/966
• Type of resource: Text
• Access conditions: Open access
• Created on: 2022-06-28 09:39:43