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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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    Effect of prior copper-coating on the microstructural development and corrosion behavior of hot-dip galvanized Mn containing high strength steel sheet

    Kancharla H.Singh S.S.Mondal K.Mandal G.K....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In the present investigation, the role of copper (Cu) pre-coating has been studied for the development of good quality corrosion-resistant hot-dip galvanized (GI) coating on high strength C[sbnd]Mn steel sheets. The Cu pre-coated GI steel has a more pronounced texture coefficient (TC) of the preferred high atomically dense (0002) crystal plane of Zn coating as compared to the GI steel without pre-coating. It has been observed that the GI coating with Cu pre-coating shows excellent surface quality in comparison to the GI coating without Cu pre-coating, which exhibits many bare spots on the final coating. Further, the Cu pre-coated GI steel has revealed the development of a continuous iron aluminide (Fe[sbnd]Al) intermetallic interfacial layer that has a uniform distribution of dense and equiaxed Fe[sbnd]Al crystals at its interface with the substrate. It can also be noticed that the Cu pre-coated GI steel has a superior corrosion resistance when compared to the GI steel without pre-coating. This is ascribed to the Cu pre-coated GI steel forming a continuous compact interfacial layer with the maximum atomically dense (0002) crystal plane and a high-quality defect-free coating.
      原文链接:
    • NSTL

    The effect of laser surface textures on the corrosion resistance of epoxy coated steel exposed to aggressive environments for offshore applications

    Giacomelli R.O.Pereira M.Xavier F.A.Cunha A....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Organic coatings are commonly applied to protect metallic structures exposed to highly corrosive environments such as those found in offshore marine scenarios. In general, steel surfaces are prepared by grit blasting prior to being coated. However, this method is associated with some negative issues such as adverse environmental impacts, and safety concerns. In this context, laser surface texturing technology is gaining attention and has been used for metal surface preparation (micromachining, drilling and functionalization) in various applications. This method offers several benefits, notably ease of automation and scalability. This paper reports an investigation on the resistance to corrosion propagation of epoxy-coated laser-textured AISI A-36 surfaces, when compared to surfaces subjected to the conventional bead and grit blasting treatments (references). Nanosecond laser surface texturing was used to create groove-like and grid-like surface patterns at the microscale level. After running accelerated corrosion tests (ISO 12944-9 standard), the performance of the epoxy coating on the laser-textured surfaces was significantly improved, indicating that the laser treatment reduces the coating delamination rate, as well as its damaged area. The surface tortuosity factor plays an important role in the effectiveness of the coatings. The results also suggest that the geometrical aspects of the groove structure (presence of recast material and V-shape) promote phenomena such as mechanical interlock and mechanical hooking of the coating. Therefore, nanosecond laser surface texturing appears to be a suitable procedure for the preparation of steel surfaces installed in offshore marine environments.
      原文链接:
    • NSTL

    Zinc aluminum-layered double hydroxide(LDH)-graphene oxide(GO) lubricating and corrosion-resistant composite coating on the surface of magnesium alloy

    Zheng Z.Jie X.Liu Y.Tan G....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Zinc aluminum-layered double hydroxide (ZnAl-LDH) was grown in-situ on the low-pressure cold gas spraying (LPCGS) Al coating by hydrothermal method. Then the composite coating zinc aluminum-layered double hydroxide-Graphene oxide (LDH-G) was formed by electrostatic adsorption of graphene oxide (GO) and ZnAl-LDH. The structure, morphology, and composition of the coating were studied. A rotational ball-on-disk tribometer (WTM-2E, China) was used to test the tribological properties of the LDH-G coating. The polarization curve and EIS measured the electrochemical properties of the LDH-G coating in 3.5 wt% NaCl solution. Due to the good mechanical properties of graphene and the corrosion inhibition effect of ZnAl-LDH, LDH-G showed an excellent reduction in wear and corrosion resistance.
      原文链接:
    • NSTL

    Effect of water in oil emulsion on the surface quality of Inconel 718 alloy during coupling electrical pulse and ultrasonic treatment

    Wang B.Ji R.Gong Z.Zhao Q....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.A new kind of water in oil (W/O) emulsion with 40 wt% of water content is developed and applied to the coupling electrical pulse and ultrasonic treatment (CEPUT) of Inconel 718 alloy. After treatment, a strengthening layer of about 450 μm is produced on the surface, the surface hardness reaches 503.8 HV, and the surface roughness Ra is reduced to 0.042 μm, reaching a mirror surface. The role of the W/O emulsion in CEPUT is analyzed, and it is found that 40% (wt% of water content) W/O emulsion can suppress the discharge between carbon brush and the sample surface, and effectively reduce the surface discharge pits. At the same time, it can provide an excellent lubrication effect, reducing the “harmful” tangential plastic deformation caused by friction, and a better surface effect can be obtained. In addition, compared with water, 40% W/O emulsion weakens the impact damage of cavitation on the sample surface and reduces the pits caused by impact. After CEPUT with 40% W/O emulsion, the average friction coefficient of the sample surface is reduced by 22.3%, and the wear amount is reduced by 43.2%.
      原文链接:
    • NSTL

    Uniform deposition of silicon oxide film on cylindrical substrate by radially arranged plasma jet array

    Xia Z.Kong X.Wang H.Xue S....
    5页
    查看更多>>摘要：© 2022In this work, the SiOx film was deposited on a cylindrical substrate by a radially arranged plasma jet array generated by an AC power supply. The properties of deposited SiOx film were studied systematically, including surface morphology, film thickness, elemental composition and chemical structure. Besides, the effect of surface modification on insulation improvement in a gas insulated transmission line (GIL) system was verified. The discharge uniformity of the plasma jet array was improved by adding ballast resistor in the series circuit. Our results showed that the SiOx films were composed with Si-O-Si group dominated by network structure along with a small amount of Si-OH group and inorganic groups (-CH2, Si-CH3). The film deposited by plasma jet array showed good uniformity on thickness and element composition. The lift-off voltage of metal particle improved by about 120.88% after SiOx film deposition. Our results provide a universal surface modification method for cylindrical substrate under mild conditions.
      原文链接:
    • NSTL

    Direct synthesis of graphene on silicon by reactive magnetron sputtering deposition

    Stankus V.Vasiliauskas A.Guobiene A.Andrulevicius M....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In the present research, the graphene was grown directly on the Si (100) substrate by a high-power impulse reactive magnetron sputtering the copper target. The samples' structure, morphology, and composition were investigated by Raman scattering spectroscopy, atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy. The synthesis temperature, time, sample position in relation to the magnetron, and grid bias effects were studied. The graphene layer number decreased with growth temperature and distance between the sample and magnetron. The defects density in graphene decreased, and graphene crystallite size increased with synthesis temperature. These parameters were changed with lateral movement of the sample's position. The graphene layer number and defects density non-monotonically depended on the grid bias voltage. We revealed that the synthesis time, the distance between the substrate and the magnetron cathode target surface, and the grid bias voltage determine the graphene surface morphology and the shape and size of the graphene flakes. It was explained by competition between the graphene growth from the CHx species, growth activation by hydrogen, etching by hydrogen and argon ions, radiative defects creation, hydrogen atoms adsorption. The changes of the electrons, argon ions and copper atoms concentration and energy, and methane dissociation products density were taken into account. The temperature gradient and ion bombardment induced stress and their release were considered.
      原文链接:
    • NSTL

    The effects of simultaneous laser nitriding and texturing on surface hardness and tribological properties of Ti6Al4V

    Wang C.Hong J.Cui M.Huang H....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The low hardness and poor tribological properties of titanium and its alloys significantly hinder their practical engineering applications, so surface nitriding or texturing is widely employed to improve the surface performances. However, previous studies mainly used the single method (surface nitriding or texturing), and simultaneous nitriding and texturing are rarely reported. Therefore, their combined effects on the surface mechanical and tribological properties are rarely investigated as well. In this study, by nanosecond pulse laser irradiation in nitrogen atmosphere, simultaneous nitriding and texturing of the Ti6Al4V surface were achieved. The effects of laser parameters including laser power, laser overlap rate, and number of scanning cycles, on the surface hardness and tribological properties of laser irradiated surfaces were comparatively studied. The experimental results showed that after simultaneous laser nitriding and texturing, the surface hardness of Ti6Al4V surface was increased by 50%~95%, and the coefficient of friction (COF) was reduced by 70%~80%. Furthermore, the laser processed surfaces obtained under various irradiation parameters presented quite different scratching characteristics, and the corresponding deformation mechanisms during scratching were analyzed. This study provides a simple and effective method by simultaneous laser nitriding and texturing for improving the surface properties of Ti6Al4V, which would be meaningful for its practical engineering applications.
      原文链接:
    • NSTL