Papers by Keyword: Electrolytic

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Authors: Yi Dong Jin, Chao Yin Nie, Chun Hua Ran, Wen Zhu, Yang Zhao, Shao Shuang Xu
Abstract: To improve adhesion strength of DLC coatings on 304 stainless steel substrate,we studied substrate pretreatment by electrolytic/chemical etching methods.In this study,The DLC coatings were deposited on two groups of 304 stainless steel which had been electrolytically and chemically etched separately. The morphology of the coatings and substrate were characterized by SEM and metalloscope. The surface roughness of substrate was measured by roughness tester .The result shows that adhesion strength of DLC coatings on 304 stainless steel substrate is improved obviously due to mechanical interlock,surface adsorption and stress release.With prolonging the etching time,the adhesion strength of DLC coatings on the chemically etched substrate increase firstly and then decrease. The adhesion strength of DLC coatings on electrolytically etched substrate continuously increase. DLC coatings on electrolytically etched substrate perform better than the one on chemically etched substrate in adhesion.This is caused by the different surface morphology.
Authors: Ping Yi Guo, Ning Wang, Peng Fan
Abstract: Ceramic oxide coatings were produced on pure titanium by plasma electrolytic oxidation in different electrolytes. The variation of coating thickness with applied voltages revealed coating almost kept a steady-state growth rate in electrolyte A and B, but not for electrolyte C. Numerous nodules occurred on the surface of the coatings at 200V in electrolyte A and B, and then nodules disappeared with the applied voltage increasing to 300V. There was no nodules occurred, and pore size was evidently different in electrolyte C. When the applied voltage was 300V, the coating formed in electrolyte C exhibited the highest corrosion potential and lowest corrosion current density in 3.5% NaCl aqueous solution.
Authors: Chi Min Lin, Shiow Kang Yen
Abstract: Biocompatibility of metallic implants and bone in orthopaedic surgery plays an important role in long-term survivor of the prosthetic implant fixation. However, titanium and its alloys do not bond to bone in the early stage of implantation (<6 months). On the other hand, titanium alloy undergoes electrochemical exchange and releases metallic ions in the physiological environment, which is believed to be the cause of implant failure. Cathodic electrolytic deposition is an important method in ceramic processing. In this paper, the nanocrystalline BaTiO3 coating were prepared by electrolytic deposition process. According to the XRD results, we can clearly identified that electrolytic deposition Barium titanate hydrate gel annealed at 350°C for 1 hr will form to BaTiO3, and its grain size about 4.85 nm. From dynamic cyclic polarization tests, we can found that dense BaTiO3 coated effective improved corrosion resistance of Ti substrate than untreated. From immersion tests, we can found that BaTiO3 exhibited excellent bioactive.
Authors: Jia Liang Guan, J.W. Fan, C.M. Ma, Zhe Jun Yuan, Dong Ming Guo
Authors: Fei Ma, Yu Shan Lu, Jun Wang
Abstract: In order to get the convex surface with phyllotactic pattern, the convex surface with phyllotactic pattern on end face of work-piece and its mask were designed based on the phyllotactic theory of biology, the surface was fabricated by electrolytic etching method, and also the fabricating processes were investigated .The results show that the convex surface with phyllotactic pattern can be fabricated by electrolytic etching method , and under the condition of room temperature (25°C), composite etching liquid which composed of NaCl,NaNO3,Na3PO4,etc., has better performance than the pure NaCl etching fluid, and in the current density of 15A/dm2, the etching rate was 3.292μm/min by composite etching liquid when steel 45 is etched. This technology can be used for fabricating the end grinding wheel with the phyllotactic pattern of abrasive clusters.
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