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Surface & Coatings Technology
Elsevier Sequoia
Surface & Coatings Technology

Elsevier Sequoia

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Surface & Coatings Technology/Journal Surface & Coatings TechnologySCIISTP
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    High-quality remanufacturing of HSLA-100 steel through the underwater laser directed energy deposition in an underwater hyperbaric environment

    Wang Z.D.Yang K.Chen M.Z.Lu Y....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Underwater laser directed energy deposition (UDED) can be employed to repair and maintain the offshore engineering structures due to its advantages of flexible adjustment of feedstock materials and controllable heat input to the structures. For the first time, preprepared HSLA-100 steel plates were successfully remanufactured by UDED at an ambient pressure of 0.3 MPa (water depth of 30 m). The relationships between the hyperbaric underwater environment, solidification process, microstructures and mechanical properties of the HSLA-100 steel were clarified. The results show that the cooperation of surrounding water, central gases and gas curtain gas with large flow rates increased the cooling rates of the underwater melt pool. A lath martensitic microstructure with high dislocation densities and a number of inclusions was formed in the sample remanufactured by UDED. The in-situ precipitation of Cu-enriched nanoparticles was caused by the unique intrinsic heat treatment involved in the underwater deposition process. The average diameter of the Cu-enriched nanoparticles increased with increasing laser energy density. The microstructure of the sample remanufactured by UDED was harder than that of the sample remanufactured by in-air DED. The Charpy impact toughness and tensile properties of the samples remanufactured by UDED were close to those of the sample remanufactured by in-air DED. This work demonstrates the feasibility of high-quality remanufacturing of HSLA-100 steel via UDED in a hyperbaric underwater environment. The results obtained in this study could provide useful guidance for the application of UDED to offshore engineering structures.
      原文链接:
    • NSTL

    Degradation of CeO2 and TiO2 co-stabilized ZrO2 by the V2O5 molten salts and Na2SO4 + V2O5 molten salts

    Wang J.Wang Y.Chen M.Wang C....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In this study, (Ce0.15Ti0.05)Zr0.80O2 (CTZ) with the tetragonal (t) phase was fabricated by solid-state reaction, and the destabilization resistance of CTZ ceramic was investigated in V2O5, and Na2SO4 + V2O5 molten salts, respectively. After CTZ was corroded in V2O5 molten salt at 700 °C for 2 h, ZrV2O7 and CeVO4 were formed, and the t phase was the main crystalline phase on the CTZ surface. After CTZ was corroded in V2O5 molten salt at 800 °C or 900 °C for 2 h, the amount of CeVO4 increased significantly, and CTZ surface underwent a more corrosion degradation than at 700 °C. After CTZ was corroded in Na2SO4 + V2O5 molten salts at 700 °C or 800 °C for 2 h, the hot corroded products were m-ZrO2 and CeVO4. However, after CTZ was corroded in Na2SO4 + V2O5 molten salts at 800 °C for 10 h or 900 °C for 2 h or 10 h, a new phase of CeO2 was formed due to the mineralization effect. The destabilization of CTZ ceramic under hot corrosion was mainly caused by the chemical interaction and phase transformation.
      原文链接:
    • NSTL

    Enhancement of oxidation and corrosion resistance of flaky carbonyl‑iron powder via SiO2/KH560/PDMS coating applied with sol-gel

    Wang B.Xie J.Lu H.Deng L....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The popular magnetic material of flaky carbonyl iron (FCI) is unfortunately vulnerable to electrochemical corrosion when exposed to a salty and foggy environment. This work reports on a sol-gel method that successfully modifies FCI particles, using lithium silicate (Li2SiO3), poly dimethyl siloxane (PDMS), and γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560), to synthesize Fe@SiO2@KH560@PDMS hybrid composite, related to its organic–inorganic hybrid coatings. The favorable hydrophobicity of organic–inorganic hybrid coatings with the static contact angle of 120° impeded the contact between corrosive medium and FCI core. The results of electrochemical experiments also confirmed its excellent corrosion resistance, since the corrosion potential Ecorr was positively shifted to 0.01 V, and the corrosion current Icorr was three orders of magnitude lower than that of the unmodified FCI particles. Thermogravimetric (TG) analysis indicates that the presence of hybrid coatings also improved the thermal stability of the produced material towards oxidation. Furthermore, the results of molecular dynamics simulation reveal that the hybrid layer inhibits the diffusion of corrosive medium.
      原文链接:
    • NSTL

    Fabrication and hydrogen permeation resistance of dense CrN coatings

    Liu L.Ruan Q.Xiao S.Huang C....
    5页
    查看更多>>摘要：© 2022Hydrogen embrittlement has become a hot research topic due to the rapid development of hydrogen energy and coating technology is regarded as the most efficient method to mitigate hydrogen embrittlement. However, the grain gaps in coatings frequently serve as paths for hydrogen permeation thus decreasing the protecting effects. In this work, ion bombardment is performed during magnetron sputtering deposition of dense CrN coatings to decrease the formation of grain gaps. The compactness of the CrN coatings is improved by disrupting the growth of grains using energetic ion bombardment. Hydrogen permeation tests reveal that the apparent hydrogen diffusion coefficient and hydrogen permeability of the dense CrN coating 52.6 and 24.1 times less than those of the unprotected substrate. The tensile test also reveals excellent hydrogen embrittlement resistance compared to the X70 substrate and conventional coatings.
      原文链接:
    • NSTL

    A study on the wear and corrosion resistance of high-entropy alloy treated with laser shock peening and PVD coating

    Liao L.Gao R.Yang Z.H.Wu S.T....
    5页
    查看更多>>摘要：© 2022 The AuthorsA cross-scale study on the effect induced by laser shock peening (LSP) and physical vapor deposition (PVD) coating on the wear and corrosion resistance of FeCoCrNiAl high entropy alloys (HEA) has been made in this work. The nano scale FeCoCrNiAl HEA coating on substrate 304 steel and microscale FeCoCrNiAl HEA has been acquired through PVD nanocoating and LSP, respectively. The micro hardness, friction and corrosion properties have been investigated to evaluate the reliability of the material in application. The results of microhardness and wear test indicate that both approaches have increased the surface hardness of HEA through grain refinement. And the results for corrosion test reveal a competing effect between grain refinement and compressive stress. As the enhancement brought by PVD nano coating is not comparable to the cast sample, due to the side effect brought by grain refinement which will reduce the corrosion resistance. Surprisingly, specimens treated with LSP have better performance in corrosion resistance, as the compressive residual stress induced by LSP enhanced the adhesion between the substrate and modified layer, forming dense passive films to inhibit corrosion ions in the environment and successfully neutralized the side effect brought by grain refinement. Therefore, the modified layer induced by LSP on the surface contributes to the improvement of both wear resistance and corrosion resistance.
      原文链接:
    • NSTL

    Titanium carbide coating to improve surface characteristic, wear and corrosion resistance of spheroidal graphite cast irons

    Gunen A.Soylu B.Karakas O.
    5页
    查看更多>>摘要：© 2022In this study, titanium carbide (TiC) coatings were grown on the surface of a spheroidal graphite cast iron (SGI) via thermo-reactive diffusion (TRD) using powder-pack processing at 800 °C, 850 °C and 900 °C for 4 h. The TiC coatings obtained on the SGI were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), surface profilometry, microhardness, VDI adhesion testing, wear testing, and electrochemical corrosion testing. Depending on the TRD temperature, continuous, crack-free, and smooth TiC coatings of 5–11 μm thickness and 27.96–32.45 GPa hardness were obtained on the surface. The high chemical stability, high hardness, and good adhesion strength of TiC coatings resulted in a reduced friction, high wear resistance, and superior corrosion resistance compared to the untreated sample. Delamination and oxidation assisted abrasive wear transformed into oxidation-assisted adhesive wear in the coated samples. Galvanic corrosion was dominant in untreated SGI, while homogeneous corrosion occurred in the coated samples. TiC coatings grown using TRD have the potential to be used in engineering components exposed to tribo-corrosive conditions.
      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

    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

    Tribological behaviors of arc sprayed NiCrMoAl alloy coating after heat treatments

    Srichen A.Moonngam S.Linjee S.Banjongprasert C....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The influence of heat treatments on tribological behaviors of arc-sprayed NiCrMoAl alloy coating were studied. The NiCrMoAl alloy coating was heat-treated at 300–700 °C for 10 and 30 days. X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) were used to study the microstructure and chemical composition. Vickers's hardness and ball-on-disk testing are used to evaluate the mechanical properties of the coating at room temperature. The heat treatment at 600 °C for 30 days led to an increase in the hardness of coatings of upto 155% compared to as-sprayed coating, due to formation of MoSi2 and oxides. The solid solution strengthening in the splats was reduced after heat treatment at a high temperature of 700 °C for 10 and 30 days at the expense of MoSi2 formation. Among heat-treated coatings, heat treatment at 600 °C for 10 days led to the lowest wear rate, whereas this was 20% higher than that of the as-sprayed coating. Moreover, the oxide content after the heat treatment at elevated temperature induced the microvoid and enhanced three-body abrasive wear due to the oxides pull-out of the coating. Therefore, a long heat treatment time, 10 and 30 days caused the poor tribological behavior of the NiCrMoAl alloy coating due to three-body abrasive wear.
      原文链接:
    • NSTL

    Effect of spray powder particle size on the bionic hydrophobic structures and corrosion performance of Fe-based amorphous metallic coatings

    Li Y.C.Zhang W.W.Wang Y.Zhang X.Y....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Fe-based amorphous metallic coatings (AMCs) with different spraying particle size powders were prepared on a 316 L stainless steel by the activated combustion high-velocity air fuel (AC-HVAF) method. The bionic hydrophobic structural characteristics and corrosion behavior of the AMCs after chemical etching and surface modification were studied by micro morphology observation and electrochemical testing. Results show that all AMCs have completely dense structure and a good combination with the 316 L stainless steel. In addition, the particle size shows a significant effect on the surface hydrophobic structure. The number of unmelted particles on the surface decreased with the decreasing particle size. As a result, micro/nanoscale hierarchical hydrophobic structures are constructed according to the Cassie–Baxter model, and an enhanced corrosion resistance is obtained given the particle size of 400 mesh. The TEM results showed that many nanoscale Cr-rich particles are randomly distributed in the AMCs. These Cr-rich particles built a nanoscale hydrophobic structure on the surface and improved the corrosion resistance of the AMCs. With the increase in the temperature and the concentration of the NaCl solution, the corrosion resistance of the hydrophobic AMCs decreased, and the water contact angle of the hydrophobic AMC with 400 mesh particle spraying powder reached 152.11°. Changing the particle size of spraying powder is an effective method to prepare the optimum bionic hydrophobic interfaces for AC-HVAF AMCs.
      原文链接:
    • NSTL