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Effect of Air Flow-Rate on Plasma Oxynitridation of 45-Steel Surfaces
Pages: 1427-1430
Year: Issue:  12
Journal: Vacuum Science and Technology

Keyword:  45 SteelPlasma oxynitridingCorrosion resistanceAir;
Abstract: The 45-steel surfaces were modified,for the first time,by plasma oxynitridation with a mixture of air,nitrogen and oxygen. The impact of the air flow-rate on the phase-structures and mechanical properties of the modified steel surfaces was investigated with X-ray diffraction,metallurgical microscope,and electrochemical workstation. The results show that depending on the air flow-rate,the newly-developed plasma oxynitridation significantly outperforms the conventional plasma nitridation. To be specific,modified at an optimized air flow-rate of 0. 2 L / min and a temperature of 550℃ for 4 h,the plasma oxynitridation layer,consisting mainly of Fe3O4 phase,was 60 μm thick,over two times thicker and with much higher corrosion resistance than the conventional plasma niridation layer. As the air flow-rate increased to over 0. 4 L / min,both the thickness and corrosion resistance decreased,possibly due to formation of Fe2O3 phase.
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