Effect of Conventional and Cathodic Cage Plasma Nitriding on the Mechanical and Corrosion Behavior of AISI 420 Martensitic Stainless Steel
André Felipe Soares do Monte e Silva, Maxwell Santana Libório, Luciano Lucas Fernandes Lima, Thércio Henrique de Carvalho Costa, Michelle Cequeira Feitor, Juliermes Carvalho Pereira, Renan Matos Monção, João Rodrigues de Barros Neto, Ediones Maciel de Sousa
TL;DR
This study compares two plasma nitriding methods to improve the hardness and corrosion resistance of a type of stainless steel.
Contribution
The study introduces cathodic cage plasma nitriding as an effective alternative to conventional methods for enhancing steel properties.
Findings
Cathodic cage plasma nitriding at 450 °C achieved high hardness (1011 HV0.5) with good adhesion.
Nitrided samples showed improved corrosion resistance in salt solutions compared to untreated steel.
Optimal results were achieved at specific temperatures without altering the steel's base structure.
Abstract
AISI 420 martensitic stainless steel was treated via conventional plasma nitriding (PN) and cathodic cage plasma nitriding (CCPN) at temperatures ranging from 400 to 500 °C for 5 h to enhance surface properties. X-ray diffraction and scanning electron microscopy analyses confirmed uniform nitride layer formation, and microhardness measurements showed a peak hardness of 1270 HV0.5 for PN at 500 °C. Notably, CCPN at 450 °C achieved similar hardness (1011 HV0.5) alongside excellent adhesion (HF1–HF2), highlighting the effectiveness of the cathodic cage technique. Electrochemical impedance spectroscopy and open-circuit potential tests in 3.5 wt % NaCl showed improved corrosion resistance in all nitrided samples compared to the untreated steel. These results indicate that specific nitriding conditions, particularly PN at 450 °C and CCPN at 400 °C, achieve an optimal balance of hardness,…
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Taxonomy
TopicsMetal and Thin Film Mechanics · Surface Treatment and Residual Stress · Boron and Carbon Nanomaterials Research