期刊,Surface & Coatings Technology 2022年433卷期_国家学术搜索

期刊信息/Journal information

Surface & Coatings Technology

Elsevier Sequoia

主办单位：Elsevier Sequoia

国际刊号：0257-8972

Surface & Coatings Technology/Journal Surface & Coatings TechnologySCIISTP

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Impact velocity-dependent bonding mechanisms in metal cold spray

Reddy, C. D.Zhang, Zhi-QianMsolli, S.Guo, Junyan...

8页

查看更多>>摘要：In this paper, we probe the bonding mechanisms for an impacting particle on a substrate, as in the cold spray process, over a range of impact velocities using molecular dynamics simulations. For the model copper/copper system, we find that grain boundary-like amorphous phase interlocking and metallurgical bonding are dominant at low and medium impact velocities, respectively, while metallurgical bonding and mechanical interlocking are dominant at high impact velocities. In particular, features including substrate crater depth, particle flattening ratio, and jetting area are tracked with varying impact velocities to further enhance our understanding of the underlying bonding mechanisms and the grain refinement in and around the interface. Because our findings are based only on small particle simulations allowable in MD, size effects can preclude extrapolating the results to physical micron-sized particles used in actual cold spray.

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Elsevier

Corrosion and wear performance of La2O3 doped plasma electrolytic oxidation coating on pure Mg

Yu, YuchengYang, JunjieLu, XiaopengBlawert, Carsten...

14页

查看更多>>摘要：With the aim of improving the corrosion and wear resistance of pure magnesium, La2O3 nano-particles are added into the PEO electrolyte. The influence of the particles on coating formation, morphology and performance is investigated. Results indicate that the porosity and thickness decrease remarkably after the particle incorporation which influences the corrosion and wear resistance in return. The coating with 1 g particle addition shows lowest porosity and highest hardness value, resulting in superior corrosion and wear performance, which implies the feasibility of the proposed strategy in fabricating functionalized PEO coatings on Mg-based materials.

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Elsevier

High-temperature oxidation performance of laser-cladded amorphous TiNiSiCrCoAl high-entropy alloy coating on Ti-6Al-4V surface

Li, ShenYamaguchi, Tomiko

9页

查看更多>>摘要：To enhance the high-temperature oxidation performance of Ti-6Al-4V alloy, we successfully prepared a TiNiSiCrCoAl high-entropy alloy coating on its surface via laser cladding technology. X-ray diffraction, scanning electron microscopy, and electron probe microanalysis were used to characterize the microstructure, elemental distribution, and high-temperature oxidation resistance of the coating. The results indicated that the microstructure of the coating was composed of a matrix and a sigma phase. Owing to the rapid cooling via laser processing and the matched delta, delta H-mix, and omega, the matrix phase was an amorphous structure rich in Ti, Si, Cr, and Co, and the sigma phase was an FCC structure rich in Ti, Ni, Co, and Al. The volume fraction of the amorphous-structured matrix in the coating increased with increasing laser scanning speed. The section after the oxidation treatment was composed of an oxide layer, a transition layer, and a coating matrix. The oxide layer was composed of TiO2, Al2O3, and NiAl2O4, and the transition layer was rich in Si, Ni, and Co. The amorphous-structured matrix exhibited a higher oxidation resistance than the FCC-structured sigma phase. Compared with the Ti-6Al-4V substrate, the oxidation resistance of the coating increased by 10.7, 28.1, 40.5, and 65.1 times at different laser scanning speeds under oxidation at 800 C for 48 h, which indicates that the coating has better oxidation resistance than the Ti-6Al-4V alloy at high temperatures.

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NSTL
Elsevier

Enhanced anticorrosion and tribological properties of Ti6Al4V alloys with Fe3O4/HA coatings

Yan, JincanXue, YuanLin, HualinRen, Tianhui...

14页

查看更多>>摘要：The poor tribological performances of titanium alloy as bone implants have important influence on its im-plantation failure. In this study, hydroxyapatite (HA) coating and Fe3O4 covered with HA (Fe3O4/HA) coating were respectively prepared on the Ti6Al4V alloy surface by chemical self-assembly. The tribological properties under dry and SBF (Simulated Body Fluid) lubrications and anticorrosion properties in SBF solution were systematically measured. The corresponding mechanisms were discussed. These results show that the Fe3O4/HA coating has more positive effect on reducing the friction coefficient and wear rates than HA coating, might due to the transformation of sliding friction into rolling friction. Furthermore, the enhanced anticorrosion properties from Fe3O4/HA coating were attributed to its shielding effect on the active ions of the solution.

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Laser cladding of Fe-based corrosion and wear-resistant alloy: Genetic design, microstructure, and properties

Shan, BoChen, JialuChen, SuiyuanMa, Mingzhi...

14页

查看更多>>摘要：To meet the needs of laser cladding remanufacturing of key parts with both corrosion and wear resistance, the "material genetic " design method was used to deduce the composition of alloy powder with the microstructure of corrosion and wear-resistant key genetic phase from the target performance of materials. The research was conducted based on the typical phase theory of traditional Fe-based alloys such as martensitic and carbide wear-resistant microstructure and austenitic and Cr-rich passivated film corrosion-resistant microstructure. A material gene design database system based on the matching design of corrosion and wear-resistant phase key genes was successfully constructed by building an atheoretical prediction model and optimizing 10,935 sets of candidate Fe-based alloy compositions using computer algorithms and thermodynamic calculations. Finally, a new 50Cr12Ni3Mo2W6Co5BSiTi3CeO(2) Fe-based alloy composition with both good wear resistance and high corrosion resistance was obtained by optimizing the design. The laser cladding formability of the designed alloy was verified and the correspondence between the key genetic microstructure and the corrosion and wear resistance was characterized with optimized process parameters. The results show that the laser cladding has good formability. The microstructure of the cladding consists of martensite and Cr23C6 carbides with the characteristics of wear-resistant key genes and austenite and Cr-rich passivation film with the characteristics of corrosion-resistant key genes. The new laser cladding of Fe-based alloy shows better corrosion and wears resistance than the 50Cr6Ni2Y alloy prepared by traditional composition design methods. We hope that this research can provide a new approach to the design of alloy compositions for laser cladding remanufacturing of Fe-based parts with both corrosion and wear resistance.

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NSTL
Elsevier

Surface modification of magnesium with a novel composite coating for application in bone tissue engineering

Braga, Jorgimara de O.dos Santos, Diogo M. M.Cotting, FernandoLins, Vanessa F. C....

12页

查看更多>>摘要：Magnesium (Mg) and its alloys are promising candidates for use in bone tissue engineering due to their good biocompatibility and mechanical stability. Nonetheless, the fast biodegradation of Mg in physiological media inhibits its use as a bone graft material. Aiming to improve its corrosion resistance, a dicalcium phosphate dihydrate (DCPD, brushite) coating was initially deposited on the hot-rolled Mg substrates by immersion in a phosphating bath at room temperature for 24 h. Polyvinyl alcohol-bioactive glass (PVA-BG) composite coatings were then deposited by dip-coating on these materials. The samples were tested for structure, corrosion behavior, and biocompatibility. The composite coatings significantly increased the corrosion protection of Mg and also accelerated the formation of HAp on its surface when soaked in a simulated body fluid (SBF). Flow cytometry assays revealed that the composites prepared had high cell viability (over 90%) when immortalized human embryonic kidney cells were tested. The coating method investigated in this work is simple, environmentally friendly, safe, and easily scalable. It is the first time that this approach is reported in the literature, which highlights its novelty.

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Elsevier

Effect of Al2O3 scales from pre-oxidation on the microstructural evolution and phase transition of NiAlHf coatings at 1200 degrees C

Li, XiaoyaZou, JianpengShi, QianDai, Mingjiang...

10页

查看更多>>摘要：The pre-oxidation treatment was conducted for NiAlHf coatings in a sealed glass tube with low oxygen atmosphere at 900 degrees C. The microstructure evolution and oxidation resistance of the NiAlHf coatings with and without pre-oxidation treatment were systematically investigated via isothermal oxidation at 1200 degrees C for up to 200 h in laboratory air. The results revealed that a dense Al2O3 scale was formed on the NiAlHf coating surface after pre oxidation treatment, which could effectively reduce oxygen pressure and Al consumption on the NiAlHf coating surface. Furthermore, the NiAlHf coating microstructure evolution was effectively delayed from beta-NiAl to the gamma-Ni3Al phase due to Al2O3 scale formation by pre-oxidation treatment. Oxidation resistance of the NiAlHf coating with pre-oxidation treatment was improved after 200 h of oxidation, of which the oxidation rate constant was enhanced by 40% compared to the NiAlHf coating without pre-oxidation treatment. The mechanism of oxygen diffusion inhibition by pre-oxidation was also discussed. This research was beneficial to understand the effect of pre-treatment on the NiAHf coating microstructure evolution and could further guide the improvement of the oxidation resistance of NiAlHf coatings for long-term oxidation.

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Elsevier

Wettability and corrosion performance of arc-sprayed Fe-based amorphous coatings

Liang, DandanZhou, YinghaoLiu, XiaodiZhou, Qiong...

9页

查看更多>>摘要：Amorphous coatings (ACs) with the composition of Fe49.7Cr18Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 were deposited by the arc-spraying technique. The wettability and corrosion performance of Fe-based ACs in 3.5% NaCl solution were investigated using contact angle measurements and electrochemical tests, respectively. Results showed that by controlling the spraying potential, the phase constituent, microstructure, hardness, wettability, and corrosion performance of the coatings were manipulated. With a spraying potential of 26 V, the highly glassy AC exhibited a denser microstructure, higher microhardness, lower surface free energy, and better corrosion resistance than the others. The superior corrosion resistance of the coatings was closely related to the surface hydrophobicity, which was dominantly governed by the microstructure of the coatings. This finding demonstrates the importance of a homogeneous and compact structure for anti-corrosion and provides a quick prediction of corrosion performance among ACs.& nbsp;& nbsp;

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The influence of the plasma-nitriding temperature on the microstructure evolution and surface properties of additive-manufactured 18Ni300 maraging steel

Godec, MatjazRuiz-Zepeda, FranciscoPodgornik, BojanDonik, Crtomir...

12页

查看更多>>摘要：Maraging steel grade18Ni300 produced by powder bed fusion (PBF) in its as built condition was plasma nitrided at three different temperatures. The aim of the work was to investigate the impact of the nitriding temperature on the microstructural changes as well as on the surface properties such as hardness, wear and corrosion resistance. The microstructural features in the bulk as well as in the nitride layer were investigated using electron-backscatter diffraction (EBSD), transmission electron microscopy (TEM) and X-Ray diffraction (XRD) analysis. The bulk microstructure consists of martensite with a small amount of retained austenite, the amount of which increases with a higher nitriding temperature. The nitriding process also causes the formation of precipitates and can therefore also act as an aging treatment. A specific lamellar structure occurs on the surface during the nitriding process, which in the majority of cases consists of the Fe4N phase. The retained austenite also transforms during nitriding to the nitride phase Fe4N. It was found that nitriding at higher temperatures leads to the formation of cracks in the nitride layer. The crack formation is related to nano and micro segregation during the LPBF. These segregations lead to austenite formation, which also takes place along the grain boundaries and transforms during nitriding to Fe4N. Higher nitriding temperatures lead to a thicker nitride compound layer and to better wear resistance. The impact of the cracks on the static mechanical properties is negligible. However, the corrosion resistance is governed by the formation of cracks at higher nitriding temperatures.

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NSTL
Elsevier

Corrosion resistance of MoS2-modified titanium alloy micro-arc oxidation coating

Chen, X. W.Li, M. L.Zhang, D. F.Cai, L. P....

10页

查看更多>>摘要：To improve the corrosion resistance of the Ti-6Al-4V alloy treated by micro-arc oxidation (MAO), molybdenum disulfide (MoS2) particles were added into the electrolyte and a composite oxide coating was formed with different MoS2 contents on the surface of Ti-6Al-4V alloy. A scanning electron microscope and a handheld roughness meter were used to analyze the surface morphology and roughness of the coating, and the corrosion performance of the MAO-treated Ti-6Al-4V alloy was analyzed by galvanic corrosion meter and electrochemical workstation. The results show that MoS2 can be successfully incorperated into the coating and block the micropores during the process of micro-arc oxidation. Electrochemical experiments showed that the coating has a higher resistance and a lower corrosion rate, while in the galvanic experiment, the galvanic potential and galvanic current of the coating also decreased. Under the experimental conditions, the addition of MoS2 can significantly improve the corrosion resistance of the MAO coating, and the best corrosion resistance is obtained when the addition amount is 4g/L, this will expand the marine applications of Ti-6Al-4V alloy.& nbsp;

原文链接:

NSTL
Elsevier