Abstract
In this research, AISI 304 austenitic stainless steels were efficient treatment using active screen plasma oxy-nitriding technique. The modified layers were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopes, and atomic force microscopy. In addition, the pitting corrosion resistances of untreated and oxy-nitrided samples were analyzed by polarization method in 3.5 wt.% NaCl solution. The results showed that a duplex-layer consisting of a deposition layer and a diffusion layer (including CrN+α phase and nitrogen expanded austenite phase) was generated. Special concern has been given to the formation of an amorphous top layer for the deposition of nano sized oxy-nitrides. It believed that the deposition layer of oxy-nitrides formed on steel surface during active screen plasma oxy-nitriding that lead to improved corrosion resistance of AISI 304 austenitic stainless steel, so that the pitting corrosive attack can be avoided.
Highlights
With excellent plasticity and corrosion resistance, austenitic stainless steel can be used as surgical tool, human implant material and testing equipment for strong magnetic field[1]
For the sample oxy-nitrided for the 410°C, two new face centered cubic peaks were presented
The atomic force microscope (AFM) surface micrographs of the treated samples are shown in Fig. 5c and d, from which it cancan observe a compact layer where oxy-nitrided particles in sizes of 80-160nm are arranged homogeneously, and no defects can be seen on the surface of treated sample
Summary
With excellent plasticity and corrosion resistance, austenitic stainless steel can be used as surgical tool, human implant material and testing equipment for strong magnetic field[1]. The formation of thin passive film on steel surface can account for the resistance to general corrosion in atmosphere condition. The components made of austenitic stainless steel may be wear and deformation failure due to its low hardness and poor tribological properties[2]. The hardness and tribological properties of austenitic stainless steels can be improved by enriching the near-surface region using low temperature plasma nitriding[8,9,10,11,12]. Active screen plasma nitriding (ASPN) comes as an alternative method to improve the modification of components surfaces[14,15,16,17,18,19]
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