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Surface & Coatings Technology
Elsevier Sequoia
Surface & Coatings Technology

Elsevier Sequoia

0257-8972

Surface & Coatings Technology/Journal Surface & Coatings TechnologySCIISTP
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    Structure, mechanical and thermal properties of TiAlBN/TiAlN multilayers

    Sun X.Chen L.Zhou J.
    5页
    查看更多>>摘要：© 2022Building multilayer architecture is an effective path to improve comprehensive properties of Al-containing nitride coatings. Here, the cubic TiAlN insertion layers are introduced to stabilize their cubic growth of TiAlBN layers through a multilayer architecture of ML_1 (Ti0.42Al0.54B0.04N/Ti0.54Al0.46N) and ML_2 (Ti0.36Al0.55B0.09N/Ti0.54Al0.46N). Based on the template effect of cubic Ti0.54Al0.46N layer, ML_1 and ML_2 multilayers exhibit coherent interfaces between B-containing and Ti0.54Al0.46N sublayers, and thereby an overall single phase cubic structure. Meanwhile, compared to Ti0.36Al0.55B0.09N with hardness of 23.0 ± 0.6 GPa, our multilayers exhibit more exceptional hardness values of 32.4 ± 0.7 GPa for ML_1 and 36.2 ± 0.9 GPa for ML_2 due to the overall cubic growth and coherent interface strengthen effect. Besides, ML_1 and ML_2 reveal better age-hardening effect during annealing process whose hardness reach 34.7 ± 1.0 GPa for ML_1 at 900 °C, and 37.6 ± 0.6 GPa for ML_2 at 800 °C, respectively. The oxidation resistance of our B-containing coatings, which is significantly better than Ti0.54Al0.46N, depends largely on the average B content. After oxidation of 10 h at 850 °C, the oxide scales of B-containing coatings are ~1.12 μm for Ti0.42Al0.54B0.04N, ~0.56 μm for Ti0.36Al0.55B0.09N, ~3.27 μm for ML_1 and ~2.74 μm for ML_2, respectively, whereas the Ti0.54Al0.46N has been fully oxidized.
      原文链接:
    • NSTL

    Synthesis of self-healing NiAl-Al2O3 composite coatings by electrochemical way

    Troncy R.Boccaccini L.Bonnet G.Pedraza F....
    5页
    查看更多>>摘要：© 2022Nickel aluminide diffusion coatings act like an aluminium reservoir to form protective alumina scales at high temperatures. However, interdiffusion phenomena play a critical role in the metallurgical integrity of these coatings. This work explores a new type of self-healing coating for high temperature oxidation applications. Micro-reservoirs consisting of an aluminium-rich intermetallic core (Al3Ni2) and an aluminium oxide shell are embedded in a nickel aluminide matrix (NiAl). This new type of coating has been synthesized by an electrochemical chemical route to trap the micro-reservoirs in an electrodeposited nickel matrix followed by aluminization via a slurry route. Under high temperature oxidation conditions, the micro-reservoirs allow to form a diffusion barrier and to release Al into the coating matrix. These two simultaneous phenomena make it possible to maintain a sufficient amount of aluminium and ensure the unique formation of α-alumina at the surface of the coatings, hence to possibly increase the lifespan of the aluminium diffusion coatings.
      原文链接:
    • NSTL

    Influence of ceramic coating pores on the Tribological performance of PEO–PTFE composite coatings on the Ta–12W alloy

    Liu L.Wang L.Pan J.Wu Z....
    5页
    查看更多>>摘要：© 2022Self-lubricating composite coatings with an intermeshing structure on the Ta–12W alloy were fabricated using plasma electrolytic oxidation (PEO) and polytetrafluoroethylene (PTFE) impregnation sintering. Porous PEO ceramic coatings were formed in alkaline silicate–phosphate electrolytes using NaF and NaOH as the pore morphology adjustment agents. The tribological performances of the PEO ceramic and PEO–PTFE composite coatings were examined under 10–70-N loadings using a ball-disk wear tester. An optimized basic PEO ceramic coating with a thickness of 25 μm, a porosity of 23.8 %, and a hardness of 1410 HV is obtained in an electrolyte containing 5 g/L of NaF and 5 g/L of NaOH. A soft PTFE lubricating layer is fixed on the hard PEO ceramic coating, forming an intermeshing structure that can effectively reduce the coefficient of friction (COF) over time while enhancing the load capacity of the composite coating. In addition, the synergistic effect of the PEO ceramic coatings and self-lubricating material is proposed. The PTFE material stored in the pores will be constantly transferred to the contact interface to achieve a reduced COF. The PEO ceramic coating with a suitable porous structure acts as an “armor” because it can withstand a large load and provide physical support to the PTFE material during the friction process. Thus, the composite coating achieves a low COF with a low wear rate and a high load-bearing capacity.
      原文链接:
    • NSTL

    Application of nano-coating technology for the protection of natural lapideous materials

    Re G.Croce A.Marchese L.Rinaudo C....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Nowadays, the coating industry offers a wide range of products to protect, decorate, and perform special functions on surfaces of objects such as automobiles, aerospace aircrafts, heavy industrial machines and structures, consumable toys, and many other products. The use of coatings as a corrosion protection agent is of great interest in the research and development industries, acting as a barrier between the material substrate and the corrosive elements. In the present work, we have tested the anti-corrosion performances of three types of protective coatings, derived from calcium-phosphate (CaP) minerals, ethyl silicate (TEOS) and polysilazanes. These coatings have been applied on different lapideous materials that belong to the groups of siliceous and carbonaceous rocks. CaP minerals and TEOS coatings are performed by the immersion of samples in baths of crafted solutions, whereas polysilazanes are applied on surfaces with techniques of spraying and brushing. Raw and coated samples have been analysed by SEM/EDX and FTIR to address their effective functionalization of the surfaces. The coated lapideous samples have been tested with corrosive agents to simulate decay processes in harsh acidic environments. The main results reveal that PHPS treated samples offers a considerable higher level of protection against acidic attack compared to the other protective coatings. Moreover, we highlighted a different behaviour among siliceous and carbonaceous surfaces treated with PHPS, as the former reveals a much longer survivability in acidic environments.
      原文链接:
    • NSTL

    Microstructure, mechanical and corrosion properties of high hardness TiVZrCrAl HEA coatings prepared by magnetron sputtering

    He L.Liu C.Shu C.Liu H....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The TiVZrCrAl high entropy alloy (HEA) coatings with different deposition temperatures were prepared on Zr-4 alloys by using radio frequency magnetron sputtering (RFMS) technology. The effect of the deposition temperature on the microstructure and mechanical performance of the coatings was studied. In addition, the corrosion properties of the coating deposited at 300 °C were tested in static pure water at 320 °C and 11.3 MPa for 45 days. The mechanism for the corrosion progress of the TiVZrCrAl HEA coating was assessed in detail. The result shows that AlVO4 formation is beneficial to prevent the dissolution of Al in the form of AlOOH, and finally enhance the anti-corrosion properties of the Zr-4 substrate.
      原文链接:
    • NSTL

    Targeted surface modification of Cu/Zn/Ag coatings and Ag/Cu particles based on sacrificial element selection by electrodeposition and redox replacement

    Wang Z.Wilson B.P.Lundstom M.Yliniemi K....
    5页
    查看更多>>摘要：© 2022 The AuthorsThe electrodeposition-redox replacement (EDRR) method was investigated for the preparation of two types of functional surfaces. A synthetic solution simulating Zn process solution containing 65 g/L Zn, 200 ppm Cu, 2 ppm Ag and 10 g/L H2SO4 was used as the source for creating functional surfaces EDRR experiments. The effects of operating parameters such as deposition potential (E1), deposition time (t1), and redox replacement time (t2) have been comprehensively studied. When E1 was selected to deposit Zn as the sacrificial metal, coherent Cu/Zn/Ag coatings with various chemical compositions, crystalline phases and surface morphology were obtained depending on the selected t1 and t2. The Cu/Zn/Ag coatings also exhibited competitive corrosion resistance (Ecorr = −683 to −634 mV vs. Hg/Hg2SO4, jcorr = 1.6–4.1 μA/cm2) when compared to those detailed in the literature. In contrast, when E1 was selected so that Cu was the sacrificial metal, separated Cu/Ag particles with controllable chemical composition, particle size (82–170 nm) and tunable surface plasmon resonance (SPR) behavior were formed through the variation of t1 and t2. In addition to the ability to tailor different functionalities for the surfaces from the same solutions, the process was performed in a single electrochemical cell without the addition of any complexing agents. Overall, these promising results demonstrated the versatility of the EDRR method to create various high value-added functional materials from complex hydrometallurgical solutions which contain multiple metal impurities.
      原文链接:
    • NSTL

    Deformation evolution of Cu/Ta nanoscale multilayer during nanoindentation by a molecular dynamics study

    Wang J.Shi J.Lu Y.Jin G....
    5页
    查看更多>>摘要：© 2022Molecular dynamics simulation of nanoindentation is performed to study the plastic deformation evolution of Cu/Ta and Ta/Cu nanoscale multilayers with effects of layer thickness and interface orientation relationship. The results reveal that the plastic deformation mechanism is determined by both the intrinsic property of monolayer and the interface characteristic, and the mechanical property has an important dependence on Ta deformation. The interface could strongly interact with and adsorb lattice dislocations, acting as the primary emission source of dislocations due to high stress concentration. The Cu/Ta interface exhibits a strong blocking effect obstructing dislocation traversing interface, while the Ta/Cu interface could transmit deformation stress to activate Cu layer deformation. The effect of interface orientation indicates that the propagation of crystal defects depends on slip system of monolayer, and the dislocation evolution in Ta layer shows a two-step mechanism: the V-shaped structure formation, and its cusp and root segments triggering the subsequently extended dislocations. Contrarily, the high-energy OT orientation interface causes random defect structures. The indentation hardness reveals two critical thicknesses (70 and 160 Å for Ta/Cu multilayer, 40 and 160 Å for Cu/Ta multilayer), which strongly depend on the size of indenter and indentation depth at nanoscale. This work provides an important understanding of the resistance of nanostructured materials to mechanical deformation for designing wear-resistant coatings and structural nanocomposites.
      原文链接:
    • NSTL

    Work softening mechanism and microstructure evolution of nanostructured Mg-8Gd-3Y alloy during severe shot peening

    Gan J.Jiang C.Guagliano M.Liu H....
    5页
    查看更多>>摘要：© 2022A two-step severe shot peening (SSP) method was designed to investigate the softening mechanism of nanostructured Mg-8Gd-3Y (GW83) alloys and its effects on the surface characteristics of the deformation layer. The experimental results indicated that a gradient deformation layer with nanocrystalline (50–100 nm) near the surface layer was fabricated by single SSP (0.54 mmN). The corresponding formation mechanism of nanocrystalline was mainly owing to continuous dynamic recrystallization (cDRX). By applying the two-step SSP (0.54 + 0.23 mmN) treatment, softening occurred near the surface layer (<50 μm) due to the occurrence of partial discontinuous dynamic recrystallization (dDRX). The reason for dDRX behavior during SSP treatment resulted from the combined effects of high-level stored strain energy and heat production. This softening behavior was characterized by the increase of domain size, the slight enhancement of basal texture, and the decrease of dislocation density and microhardness. Therefore, appropriate SP parameters should be selected to avoid material softening when obtaining nanocrystalline Mg alloys.
      原文链接:
    • NSTL

    Effect of energy distribution on the machining efficiency and surface morphology of Inconel 718 nickel-based superalloy using plasma electrolytic polishing

    Qian N.Su H.Zhang Z.Ding W....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Inconel 718 nickel-based superalloys are important aerospace materials whose precision surfaces have important applications in key aerospace components. It is significant and challenging to obtain precise surfaces of Ni-based superalloys with high efficiency and quality. Plasma electrolytic polishing (PEP) is a rapidly developing high-efficiency and high-quality metal surface polishing process and is an application process for obtaining precise surfaces of superalloys. Research on the influence of vapor gaseous envelope (VGE) behaviors and the evolution process on the polishing effect remain insufficient, although the behavior of the VGE affects the machining efficiency and surface morphology of the superalloy. In this study, the evolution process of the VGE was analyzed and simulated using experimental and simulation methods. The effects of the VGE behavior characteristics on the surface morphology and polishing efficiency were explained from the perspective of energy distribution. The experimental results showed that a discontinuous and fluctuating VGE favored the removal of materials and finishing of the workpiece surface. When the voltage exceeded 400 V, the heat flux at the gas-liquid interface exceeded the critical heat flux, and the VGE evolved from bubbles to a vapor film which deteriorated the polishing effect. Finally, the voltage range for obtaining the precision surface of the superalloy was 250–350 V, while the temperature range of the electrolyte was 70–85 °C.
      原文链接:
    • NSTL

    Comparative tribological behavior of TiN monolayer and Ti/TiN multilayers on AZ31 magnesium alloys

    Xie W.Zhao Y.Wang S.Zhang S....
    5页
    查看更多>>摘要：© 2022The TiN monolayer and Ti/TiN multilayers were prepared on the AZ31 magnesium alloys by filter cathodic vacuum deposition. The TiN monolayer with highest hardness among the coatings failed during friction as its poor resistance to crack propagation, low toughness, and poor deformation coordination between the coating and substrate. The Ti/TiN multilayers with layered structure had lower hardness but withstood the friction process due to their higher toughness, better resistance to crack propagation and good deformation coordination between the coating and substrate. The layer by layer wear mechanism was revealed through observing the cross-sectional SEM morphology of the wear track of the Ti/TiN multi-2 coating. Compared with the Ti/TiN multi-2 coating, the Ti/TiN multil-6 coating with higher flow rate of nitrogen introduction had lower wear rate as its higher hardness but produced brittle cracks.
      原文链接:
    • NSTL