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《电镀与涂饰》2020,(15)
为提高钛合金的抗冲蚀性能,采用真空阴极电弧离子镀技术在不同表面粗糙度(Ra)的TC4钛合金表面制备了Ti/Ti N/Zr/Zr N多层膜。采用扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计、划痕仪和砂粒冲刷试验仪分析了多层膜的截面形貌、微观结构、厚度、显微硬度、结合力和抗砂粒冲刷性能。重点研究了基体表面粗糙度对多层膜的结合力和抗砂粒冲刷性能的影响。结果表明,所得Ti/TiN/Zr/ZrN多层膜厚度约为12μm,显微硬度大于3 000 HV,能显著地提高TC4钛合金基材的抗砂粒冲刷性能。在相同工艺条件下,基体表面粗糙度越小,其表面膜层的结合力和抗砂粒冲刷性能越佳。为获得综合性能良好的Ti/TiN/Zr/ZrN多层膜,TC4钛合金基体的表面粗糙度必须控制在≤1.60μm。 相似文献
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采用多弧离子镀技术在高速钢表面制备了(Ti,Cr)N镀层,通过电化学工作站对镀层的塔菲尔曲线进行测试,分析镀层的耐腐蚀性,并采用质量变化法对电化学测试结果进行了验证。利用扫描电子显微镜观察了(Ti,Cr)N镀层腐蚀前后的微观形貌。结果表明,随电流比例ICr/ITi的增大,(Ti,Cr)N镀层表面晶粒尺寸逐渐减小。当ICr/ITi为90 A/60 A时,基体的自腐蚀电位由-0.750 V正移至-0.534 V,基体的腐蚀速率降低85.67%,耐蚀性提高。基体的腐蚀主要为点蚀和均匀腐蚀,(Ti,Cr)N镀层主要为小孔腐蚀。 相似文献
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采用有限元分析软件ANSYS对2Cr13基体等离子喷涂Sm2Zr2O7/YSZ双层热障涂层界面残余热应力分布进行了仿真。结果表明:在涂层Sm2Zr2O7/YSZ及YSZ/NiCoCrAlY界面存在较大的残余热应力,且应力梯度基本不变,表明应力梯度与基体厚度、半径无关。 相似文献
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《Ceramics International》2021,47(19):27430-27440
Steel materials employed in severe conditions including strong corrosion, high load and multi-factor coupling damages can easily cause incredible degradation until failure, and the protective CrN-based coatings should be one of promising candidates to relieve those damages for the steel equipment or components. In present paper, the monolayer CrAlN and multilayer Cr/CrAlN coatings were successfully deposited on steel substrates by multi-arc ion technology, and their microstructure, mechanical, tribological and corrosion performances were systematically investigated. The results show that the special multilayer Cr/CrAlN coating could possess much better load-bearing capacity and wear resistance than that of monolayer CrAlN coating, which was due to the facts that the multilayer architecture can effectively release the internal stress and inhibit the expansion of defects. Particularly, the multilayer interfaces could effectively prevent the aggressive medium in seawater infiltrating into the inside of coating, and thus the multilayer Cr/CrAlN coating could have higher corrosion resistance compared to monolayer CrAlN coating. As a result, this multilayer Cr/CrAlN coating could achieve excellent combined performances, indicating that it has greatly potential application as protective coating in seawater. 相似文献
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Ping Chuan Siow Jaharah A. Ghani Mariyam Jameelah Ghazali Talib Ria Jaafar Mohamad Asri Selamat Che Hassan Che Haron 《Ceramics International》2013,39(2):1293-1298
Coating a cutting tool improves wear resistance and prolongs tool life. Coating performance strongly depends on the mechanical and chemical properties of the coating material. In a machining process, the type of selected coating depends on the cutting condition because of the properties of the applied coating material. In addition, many factors, such as coating thickness, composition ratio, sequences of layers in multilayer coatings, and the deposition method influence the performance of a coating. In this study, the mechanical properties of TiCN and TiCN/ZrN were investigated using a ball on disk test. The substrate material made from a carbide-based cutting tool was also developed in-house. The analysis performed shows that the performances of TiCN and TiCN/ZrN coatings were found to be comparable to that of the commercial TiN-coated carbide-based cutting tool. Both the in-house and commercial coated inserts had significantly lower coefficient of friction than uncoated inserts, and the friction coefficient of TiCN coatings was constantly slightly lower than that of TiN coatings. Moreover, the coefficient of friction of the in-house developed TiCN was slightly lower than that of commercial TiN coating. However, the coefficient of friction of the in-house developed uncoated carbide inserts was slightly higher than that of commercial uncoated carbide inserts. 相似文献
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《Ceramics International》2023,49(2):2102-2114
To determine the possibility of using new thin films architectures as biocompatible materials, an experimental and computational study was performed to evaluate the mechanical, tribological, and corrosion properties in simulated physiological media (saliva and blood plasma) of Zr, ZrN, and ZrN/Zr coatings, deposited by PVD magnetron sputtering. The crystalline structure and chemical composition were well correlated with high resistance to plastic deformation, wear, and corrosion, making these materials excellent candidates for functionalizing and protecting dental prostheses. The predominant wear mechanism under consideration was abrasion, which was reduced when using ceramic ZrN coating as a base for the superficial Zr thin film. When exposed to simulated body fluids, these materials exhibited high corrosion resistance, which was demonstrated by potentiodynamic measurements. These results are consistent with those predicted by Density Functional Theory computational models, which showed that electron transfer associated with the wear mechanism is kinetically impeded, as a consequence of the large energy barriers for this process associated with the adsorption of the molecular species on the ZrN surface. Additionally, calculated adsorption energies indicated that urea (from the simulated saliva solution) interacts strongly with the surface. This interaction was associated to the formation of passivating protective layers, which is a key mechanism to protect against corrosion, acting in synergy with the kinetic barriers. 相似文献
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Studies on plasma sprayed bi-layered ceramic coating on bio-medical Ti-13Nb-13Zr alloy 总被引:1,自引:0,他引:1
S. SathishM. Geetha S.T. Aruna N. BalajiK.S. Rajam R. Asokamani 《Ceramics International》2011,37(4):1333-1339
Biomedical Ti alloys are prone to undergo degradation due to the combined effect of wear and corrosion. To overcome these problems, surface modification techniques are being used. In this paper, the biomedical Ti alloy Ti-13Nb-13Zr was plasma sprayed with nanostructured Al2O3-13 wt%TiO2, yttria stabilized zirconia powders and bilayer containing alternate layers of the two coatings to improve the corrosion resistance and microhardness of the substrate. The plasma sprayed coatings were characterized by X-ray diffraction, scanning electron microscopy and Raman spectroscopy. The microstructure, microhardness and surface roughness of the coatings were investigated. The corrosion resistance of the coatings was studied in simulated body conditions. The results show improved corrosion resistance for the bilayered coating compared to the individual plasma sprayed coatings on biomedical Ti-13Nb-13Zr alloy substrate. 相似文献
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45号钢表面化学镀镍磷合金 总被引:2,自引:0,他引:2
在45号钢表面化学镀镍磷合金,获得含磷10%(质量分数)的镍磷合金镀层,比较了其与2Cr13不锈钢的耐磨性及在不同腐蚀介质中的耐蚀性,结果表明,含磷10%的镍磷合金层的耐磨,耐蚀性均优于2Cr13不锈钢。 相似文献
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针对超级13Cr不锈钢管材料在各种环境下所面临的腐蚀问题,介绍了其CO2腐蚀机理及其影响因素,分析了腐蚀产物膜成分破坏机理,简要说明了超级13Cr不锈钢几种常见的腐蚀类型,并提出了今后超级13Cr不锈钢及其腐蚀行为研究的重要方面,为今后油套管材料提供参考。 相似文献
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The electrochemistry of a 13% Cr stainless steel (API5CT L80-13Cr) in 3% NaCl containing acetate and either acetic acid or carbon dioxide at 333 K is explored using RDE voltammetry. The reduction of proton, carbonic acid and acetic acid occur simultaneously, immediately negative to the corrosion potential. Acetic acid gives a well formed reduction wave and the current densities increase with the equilibrium concentration of acetic acid in the medium; in the plateau region, the reduction is mass transport controlled. Despite this reduction process, the corrosion resistance and passivation current density are independent of the acetic acid concentration. It is confirmed that the 13% Cr stainless steel is much more resistant to corrosion that X65 carbon steel and, unlike the carbon steel, its rate of corrosion does not vary with acetic acid concentration. The properties of the passivating film appear to dominate the behaviour of the 13% Cr stainless steel. 相似文献
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Jean-Baptiste Cambon Florence AnsartJean-Pierre Bonino Viviane Turq 《Progress in Organic Coatings》2012
Stainless steels are increasingly used in the aeronautics field for the manufacture of structural parts. One of them, the X13VD martensitic stainless steel (X12CrNiMoV12-3), known for its good mechanical properties, has a poor corrosion resistance in confined or severe environments. In the past years, Cr(VI) based pre-treatments have been currently used for corrosion protection of different metals, however, they are toxic and due to environmental regulations, they will be definitely banned in a near future. Alternatives to replace Cr(VI) show advantages and drawbacks considering key properties such as: corrosion resistance, adhesion of coatings, fatigue resistance, durability and reliability. However, some of their possible alternatives show high potential. 相似文献