Srikanth Srikanti, Saravanan Pandurangan, Alphonsa Joseph, and Ravi Kilaru:
Microstructural evolution in a plasma nitrided commercial low-carbon steel and its electrochemical corrosion behaviour
Low-carbon steel, plasma nitriding, nitrogen pearlite, microstructure, corrosion
Plasma nitriding of low-carbon steel with mass contents of 0.054 %C and 0.18 %Mn has been carried out under glow discharge
nitrogen plasma at three temperatures viz. 500, 450 and 400 °C for 5 h to identify treatment conditions conducive for
the high uptake of soluble nitrogen and the formation of nitrogen pearlite (eutectoid transformation product composed of a-Fe and g'-Fe4N) at the steel surface. After heat treatment, the nitrided steel test pieces showed considerable enrichment in nitrogen mass contents (6.53 to 7.15 %) at the surfaces and exhibited an array of microstructures comprising iron nitrides (e-Fe3N/g'-Fe4N), austenite, nitrogen pearlite and ferrite microstructure of base steel, from surface to center, depending on nitriding temperature and concentration gradient of the ingressed nitrogen governed by Fick´s diffusion kinetics. At 450 and 400 °C, the predominant steel microstructure at the steel surface was composed of nitrogen-enriched ferrite and nitrogen pearlite. Under potentiodynamic polarization in 3.5 % NaCl, the nitrided surfaces were found to exhibit distinct passivity, corrosion rates as low as 0.0025 - 0.005 mm/a and pitting potentials over 600 mV. In electrochemical impedance spectroscopy, the charge transfer resistance increased to the high value of 104 O cm2, about two orders of magnitude higher than for an untreated steels.
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