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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 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

    Preparation of chitosan/hydroxyapatite composite coating obtained from crab shells on hierarchical micro/nano-textured Ti surface

    Ho Y.-C.Chang H.-H.Ho W.-F.Hsu H.-C....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In this study, crab shell bio-waste was used to fabricate chitosan/hydroxyapatite (CS/HA) coatings on the surface of pure titanium (Ti). HA is the main inorganic component in human bone; it has favorable biocompatibility, bioactivity, and osteoconductivity. CS can promote cell adhesion, proliferation, and differentiation and is highly antibacterial. Additionally, acid etching plus alkaline treatment was adopted to create micro/nano-textured hierarchical topographical features on the surface of Ti samples, and the CS/HA composite coating was then prepared through hydrothermal treatment and added to the chemically pretreated Ti surfaces. A nanoporous network structure was formed after alkali treatment, and the micropores remained after acid etching. The CS/HA layer coated on the strut surface of the porous network structure was thin and did not entirely fill and block the nanoporous network structure. Therefore, this surface contained a favorable three-dimensional microenvironment for cell attachment. The Ti surface exhibited the highest roughness (482.2 nm) after acid etching and alkali treatment, and it presented a superhydrophilic surface (contact angle of less than 10°). Subsequently, when the surface was coated with CS/HA, the roughness slightly decreased to 400.7 nm, and the water contact angle slightly increased to 21.6°. After the CS/HA-coated sample was immersed in simulated body fluid for 7 days, many apatite particles were deposited on the surface, indicating that the coating had favorable bioactivity.
      原文链接:
    • NSTL

    Improvements of surface tribological properties by magnetic assisted ball burnishing

    Viharos Z.J.Kovacs Z.F.Kodacsy J.
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The effect of the magnetic assisted ball burnishing on a general, C45 steel was investigated considering tribological aspects. In engineering practice, the tribological properties of machined surfaces are characterized by amplitude roughness parameters from roughness profiles, as Rpk, Rk, Rvk, Rsk and Rku. Information about the sliding properties can be described by these parameters together with the oil retention capacity of the surface. Despite the conventional burnishing processes used as a post-machining operation, the authors applied a newly designed magnetic assisted ball burnishing method and tool, which can also burnish flat or harmonically changing surfaces and is able to round the edge of the workpiece in one pass as well, immediately after milling. To increase efficiency of the applied burnishing process, different types of burnishing strategies were applied and compared. The results of the investigations showed that the magnetic assisted ball burnishing decreases the frictional resistance, and at the same time it creates advantageous oil pockets on the machined surface.
      原文链接:
    • NSTL

    Pathway to tailor the phase composition, microstructure and mechanical properties of pulsed laser deposited cobalt-substituted calcium phosphate coatings on titanium

    Markovic S.Stojanovic Z.Veselinovic L.Ignjatovic N....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Dense calcium phosphate-based ceramics were fabricated to be used as targets for pulsed laser deposition (PLD). Nanostructured cobalt-substituted hydroxyapatite (Co:HAP) was used as a starting powder. To vary phase composition and microstructure of targets, two sintering approaches were applied, conventional (CS) and two-step sintering (TSS). The obtained results show that in both cases biphasic calcium phosphate (BCP) ceramics (targets) were prepared, with slightly different HAP-to-β–TCP amount ratio and a significantly different microstructure. While the CS method yielded fully dense ceramics with an average grain size of 1.3 μm, the ceramics prepared by TSS had a density of 98.5%, with a predominant grain size below 100 nm. (Ca + Co)P coatings were prepared by PLD of (Ca + Co)P targets. The temperature of the Ti substrate was adjusted to be 25 and 500 °C. The results show that the phase composition of (Ca + Co)P coatings depended on the phase composition of targets as well as on the temperature of the Ti substrate. The coating prepared at 25 °C using CS target consisted of three calcium phosphate phases, HAP, β–TCP and α–TCP; when the TSS target was used, the coating was biphasic, containing HAP and β–TCP. When the substrate was heated to 500 °C, regardless of whether the CS or the TSS target was used, the deposited coatings were composed of HAP and α–TCP. Due to different phase compositions, the (Ca + Co)P coatings deposited at 25 °C showed an improved hardness compared to those deposited at 500 °C. The obtained results confirmed that the phase composition, morphology and mechanical properties of 0.3 μm thick (Ca + Co)P coatings on a Ti substrate can be tailored by employing (Ca + Co)P targets with different microstructures, and also by varying the temperature of the Ti substrate during deposition experiments.
      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

    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

    Influences of the near-spherical 3D pore on failure mechanism of atmospheric plasma spraying TBCs using a macro-micro integrated model

    Dong X.-X.Cai H.-N.Zhao S.-D.Wei Z.-Y....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.The near-spherical 3D pores in the thermal barrier coatings (TBCs) by atmospheric plasma spraying (APS) affect the thermal insulation and anti-spalling performance of the coating. To explore the effects of near-spherical 3D pores on the coating failure, a macro-micro integrated model is developed. The randomly distributed pores are implanted into the ceramic layer inside the micro region by the secondary development of Python program. The dynamic propagation, coalescence, or branching of cracks in the ceramic layer are achieved by embedding cohesive elements between adjacent solid elements. The effects of pore characteristic parameters: porosity, aspect ratio, and orientation angle on the crack evolution are investigated. In addition, the effect of TGO on the ceramic cracking is also examined in the porous model. The results show that the stress concentration near the near-spherical pores can induce early crack initiation. Regular spherical pores with a porosity of about 10% are more conducive to the improvement of coating life. When a large number of near-spherical 3D pores appear, TGO thickening still induces premature spallation of the coating. These results can provide important theoretical guidance for the advanced TBC system design with long lifetime.
      原文链接:
    • NSTL

    On the origin of micro-cracking in zinc-coated press hardened steels

    McDermid J.R.Bassim N.D.Maleki K.Pallisco D.M....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Zn-coated press hardened steels (PHS) are in high demand for automotive mass reduction and enhanced passenger safety applications while the Zn coating supplies robust cathodic corrosion protection. However, the mechanism of micro-crack formation during direct hot-press forming (DHPF) has not been adequately described. Thus, the objective of this work was to determine the mechanism for micro-crack formation in Zn-coated DHPF PHS that addressed the relationship between micro-cracking and the coating microstructure created during substrate austenitization. Zn-coated 22MnB5 steel sheets were annealed at 900 °C for annealing times ranging from 30 to 780 s and DHPF at 75 °C s−1 to obtain a fully martensitic substrate microstructure. The inward diffusion between the Zn coating and the substrate during annealing resulted in a dual phase coating microstructure initially comprising Γ-Fe3Zn10 + α-Fe(Zn), transitioning to a single phase α-Fe(Zn) coating after annealing for 240–420 s. Coincident coating α-Fe(Zn) and substrate Zn-enriched austenite (γ-Fe(Zn)) grain boundaries became Zn-enriched, forming a thin layer of α-Fe(Zn) along the γ-Fe(Zn) grain boundaries. It is proposed that coincident coating α-Fe(Zn) and substrate prior austenite grain boundaries (PAGBs) were weakened by this grain boundary α-Fe(Zn) layer. Upon the application of tensile stress, intergranular fracture occurred along the coincident coating α-Fe(Zn) and Zn-enriched PAGBs in the Zn-enriched martensite (M(Zn)) layer. It was further determined that crack propagation ceased and the crack tip was blunted when Zn-enrichment along the PAGBs in the M(Zn) layer was exhausted.
      原文链接:
    • NSTL

    The effect of Sr addition on the microstructure and corrosion behaviour of a Mg-Zn-Ca alloy

    Song J.Gao Y.Liu C.Chen Z....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The application of magnesium alloys is rather limited due to their poor corrosion resistance despite of their promising mechanical properties. Alloying is considered one of the most efficient methods to influence the corrosion susceptibility of Mg alloys either by altering the bulk microstructures or by changing the surface chemistries. In the present study, the effects of Sr addition on the microstructure and corrosion properties of a Mg-Zn-Ca alloy were studied. The microstructure characteristics of the alloys were investigated using optical microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, while the corrosion properties were evaluated by hydrogen collection method and electrochemical techniques including potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicate that Sr addition significantly deteriorates the corrosion performance of the Mg-Zn-Ca alloy mainly by forming more micro-galvanic couples due to the precipitation of the more populous secondary phase particles. The corrosion product film accumulated on the sample surface marginally affects the corrosion resistance, as their compactness is rather compromised as the immersion time is prolonged.
      原文链接:
    • NSTL