CHARACTERISTICS OF AISI 420 STAINLESS STEEL MODIFIED BY COMBINING GAS NITRIDING AND CrN COATING

Authors

DOI:

https://doi.org/10.36547/ams.27.3.1035

Keywords:

Arc-PVD; 420 martensitic stainless steel; gas nitriding; CrN coating; corrosion resistant; duplex coating

Abstract

AISI 420 stainless steel is widely used in applications where wear and corrosion resistance are required. However, the heat treatment and nitriding process can drastically reduce the corrosion resistance of this stainless steel. This article focuses on investigating the influence of steel substrate and gas nitriding efficiency at two temperatures of 520 oC and 550 oC on some properties of CrN coating. The experiments were carried out to evaluate the surface hardness, microstructure and phase composition of nitrided layers. The coating adhesion and load capacity of the coating were performed according to VDI 3198 standard. Electrochemical testing was performed in a solution of 3.5% NaCl and then using the Tafel method to determine the corrosion current and corrosion potential. The thickness of CrN and CrN/CrN coating was 1.6 μm and 3 μm, respectively. The study showed that the corrosion resistance of coatings fabricated through duplex technology was affected not only by the normal defects but also by the porosity on the nitrided surface. The corrosion resistance of multilayer duplex coating was improved compare with mono-layer duplex coating due to its ability to cover and reduce pores and pitting defects.

Author Biography

Van Doan, Vietnamese-Russian Tropical Center

Vietnamese-Russian Tropical Center: Ho Chi Minh city, Ho Chi Minh city, VN
2018-03-17 to present | Researcher (South Branch)

University of Defence: Brno, CZ
2014-09-01 to 2017-08-31 | Ph.D (Mechanical Engineering)

 

Downloads

Published

2021-09-13

How to Cite

Nguyen, T. V. ., Doan, V. T., Trinh, T. V. ., & Vu, H. V. . (2021). CHARACTERISTICS OF AISI 420 STAINLESS STEEL MODIFIED BY COMBINING GAS NITRIDING AND CrN COATING. Acta Metallurgica Slovaca, 27(3), 146-151. https://doi.org/10.36547/ams.27.3.1035
Received 2021-07-07
Accepted 2021-08-26
Published 2021-09-13

Most read articles by the same author(s)