Microstructure and corrosion resistance of pure titanium surface modified by double-glow plasma surface alloying

W-Mo and W-Mo-N surface-modified layers on Ti6Al4V alloy were obtained using a double glow plasma surface alloying technique. The morphology, microstructure, and chemical composition distribution of the modified layers were analyzed by scanning electron microscope, Xray diffraction, and glow discharge optical emission spectrometry. The hardness and toughness of the modified layers were measured using a micro-hardness tester, and dynamic repeating press equipment. The wear resistance in ambient air and the corrosive wear resistance in NaCl solution were evaluated using a ball-on-disk wear tester. The results show that W-Mo and W-Mo-N surface modified layers are composed of the alloying layers which vary in composition and phase form along the depth. A microhardness gradient was observed in the modified-surface layers. The surface hardness of the W-Mo-N and W-Mo modified layers was 25.3 and 14.2 GPa, which is seven-fold and 3.9-fold harder than the Ti6Al4V substrate, respectively. W-Mo and W-Mo-N surface-modified layers significantly improved the wear and corrosion resistance of Ti6Al4V. It seems that the wear resistance of W-Mo and W-Mo-N surface-modified layers in NaCl solution is better than that in ambient air owing to the strong lubricating effect of NaCl solution and the excellent corrosion resistance of the modified layers.

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DOUBLE GLOW PLASMA SURFACE ALLOYING ANTIBACTERIAL SILVER COATING ON PURE TITANIUM

Surface Review and Letters ◽

10.1142/s0218625x14500322 ◽

2014 ◽

Vol 21 (03) ◽

pp. 1450032 ◽

Cited By ~ 5

Author(s):

NAIMING LIN ◽

JUNWEN GUO ◽

RUIQIANG HANG ◽

JIAOJUAN ZOU ◽

BIN TANG

Keyword(s):

Bacterial Adhesion ◽

Antibacterial Property ◽

Pure Titanium ◽

Silver Coating ◽

Surface Alloying ◽

Plasma Surface ◽

Commercial Pure Titanium ◽

Titanium Dental Implant ◽

Glow Plasma ◽

Plasma Surface Alloying

In order to endow the commercial pure titanium dental implant material with antibacterial property and aimed at avoiding the invalidation that is caused by bacterial adhesion on the surface, a silver coating was fabricated via double glow plasma surface alloying. The antibacterial property of the silver coating was assessed via in vitro estimation. The results showed that a continuous and compact coating was formed. The silver coating had absolute superiority in antibacterial property to raw commercial pure titanium. Double glow plasma surface alloying with silver on commercial pure titanium dental implant material could be considered as a potentially effective method for preventing bacterial adhesion.

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Effect of Heating Treatment on the Microstructure and Properties of Cr–Mo Duplex-Alloyed Coating Prepared by Double Glow Plasma Surface Alloying

Coatings ◽

10.3390/coatings9050336 ◽

2019 ◽

Vol 9 (5) ◽

pp. 336 ◽

Cited By ~ 5

Author(s):

Jianjun Hu ◽

Jing Wang ◽

Jie Jiang ◽

Xian Yang ◽

Hongbin Xu ◽

...

Keyword(s):

Corrosion Resistance ◽

Surface Alloying ◽

X Ray Diffraction ◽

Plasma Surface ◽

Heating Treatment ◽

Glow Plasma ◽

And Performance ◽

Electron Imaging ◽

Quenching And Tempering ◽

Plasma Surface Alloying

In this study, Cr–Mo duplex-alloyed coating was prepared on carbon steel by double glow plasma surface alloying (DGPSA). The effect of annealing and quenching and tempering (Q&T) treatments on the microstructure and performance of the coating was investigated by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), backscattering electron imaging (BSEI) and electron backscattering diffraction (EBSD) techniques. The results show that a gradient structured coating composed of an Fe–Cr–Mo solid solution (Fe–Cr–Mo SS) layer and an alloyed pearlite layer was obtained on the steel surface. The affected layer was adjacent to the coating. After annealing or Q&T, more carbides precipitated in the Fe–Cr–Mo SS layer and alloyed pearlite layer. Most of the C atoms in the subsurface were dragged into the coating to form carbides in the Fe–Cr–Mo SS and alloyed pearlite layers of the coating, transforming the affected layers into a carbon-poor zone. Annealing and Q&T hardly modified the thickness of the coating, but greatly changed the hardness and corrosion resistance of the coating. The Q&T treated samples had higher hardness and better corrosion resistance than the as-DGPSA treated and the annealed samples.

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Performance Enhancement in Borocarburized Low-Carbon Steel by Double Glow Plasma Surface Alloying

Coatings ◽

10.3390/coatings10121205 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1205

Author(s):

Zheng Ding ◽

Qiang Miao ◽

Wenping Liang ◽

Zhengang Yang ◽

Shiwei Zuo

Keyword(s):

Corrosion Resistance ◽

Carbon Steel ◽

Low Carbon Steel ◽

Chloride Ions ◽

Future Application ◽

Low Carbon ◽

Surface Alloying ◽

Plasma Surface ◽

Glow Plasma ◽

Plasma Surface Alloying

In this paper, the performance of low-carbon steel is enhanced after introducing a borocarburized diffusion layer via double glow plasma surface alloying technology. Due to the boron-carbon gradient structure of low-carbon steel, the protective coating exhibits an excellent wear and corrosion resistance. Interestingly, the borocarburized layer consists of a 64 μm carburized layer and a 27 μm boride layer, which plays an effective role in enhancing the microhardness of borocarburized low-carbon steel, exhibiting a 1440 Vickers hardness increase in the surface microhardness of low-carbon steel. The potentiodynamic polarization measurement and impedance measurement results indicate that the boride protective film can effectively prevent aggressive chloride ions from invading the substrate, which indicates an excellent property of corrosion resistance. This systematic study paves a promising way for the future application of hard coatings in severe environments.

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