The Experts below are selected from a list of 12408 Experts worldwide ranked by ideXlab platform
Sebastian Munstermann - One of the best experts on this subject based on the ideXlab platform.
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fracture properties of Zinc Coating layers in a galvannealed steel and an electrolytically galvanized steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018Co-Authors: Jinshan He, Junhe Lian, Anke Aretz, Napat Vajragupta, Ude Hangen, F Goodwin, Sebastian MunstermannAbstract:Abstract The Zinc Coating layer fracture properties of a galvannealed steel and an electrolytically galvanized steel are analyzed by conducting the in-situ bending test with newly designed samples. It is found that the fracture develops much earlier in the Coating layers of the galvannealed steel than that of the electrolytically galvanized steel. Using transmission electron microscope and energy dispersive X-ray spectroscopy, the intermetallic phases of the Coating layers are characterized and it is found that the early crack initiation in a galvannealed steel is mainly triggered in the gamma phase. Combining with nanoindentation tests and corresponding simulation, the deformability of intermetallic phases are analyzed to explain the failure behavior of Coating layers in the two steels.
Th J M De Hosson - One of the best experts on this subject based on the ideXlab platform.
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relation between microstructure and adhesion of hot dip galvanized Zinc Coatings on dual phase steel
Acta Materialia, 2012Co-Authors: G M Song, W.g. Sloof, Th J M De Hosson, T Vystavel, N M Van Der PersAbstract:The microstructure of hot dip galvanized Zinc Coatings on dual phase steel was investigated by electron microscopy and the Coating adhesion characterized by tensile testing. The Zinc Coating consists of a Zinc layer and columnar zeta-FeZn13 particles on top of a thin inhibition layer adjacent to the steel substrate. The inhibition layer is a thin compact and continuous layer that consists of eta-Fe2Al5-xZnx fine and coarse particles. The coarse faceted particles are on top and fine faceted particles are at the bottom. The steel surface is covered with small fraction manganese oxides, which may impair adhesion of the Zinc Coating. The adhesion at various interfaces that exist in Zinc-coated steel was quantitatively estimated using a so-called "macroscopic atom" model. In addition, the adhesion at the interfaces in Zinc-coated steel was qualitatively assessed by examining the fracture and delamination behavior upon tensile testing. In accordance with this model, fracture along Zinc grain boundaries preceded fracture along the Zinc layer/inhibition layer and zeta-FeZn13 particle/inhibition layer interfaces. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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interface fracture behavior of Zinc Coatings on steel experiments and finite element calculations
Surface & Coatings Technology, 2006Co-Authors: Guiming Song, W.g. Sloof, Th J M De HossonAbstract:Hot-dipped galvanized steels are widely used in the automotive industry. The formability and damage resistance of Zinc Coatings depend strongly on their microstructure and adhesion to the steel substrate. In order to improve the mechanical performance of Zinc Coatings, the influence of their thickness, grain orientation and grain size on the Zinc Coating/steel substrate interface cracking behavior was studied. To this end, scanning electron microscopic observations during in situ tensile testing of Zinc coated IF steel sheets were performed. After partial delamination of the Zinc Coating, cross sections of Zinc coated steel were prepared to determine the location and extent of the interface cracking and the crystallographic orientation of the delaminated Zinc grains. A two-grain model using a finite element method is proposed to analyze the Zinc Coating/steel substrate interface cracking behavior. In addition, the Coating adhesion strength can be estimated based on this model. Both calculations and experimental observations show that: (i) a preferential Zinc grain orientation with the [0001] direction parallel to the interface and (ii) a small grain size mitigate Zinc Coating/steel substrate interface cracking.
Maozhong An - One of the best experts on this subject based on the ideXlab platform.
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Alternative Chromium-Free Passivation Combined with Nano-electrodeposition for Electrogalvanized Steel
Journal of Materials Engineering and Performance, 2018Co-Authors: Qingyang Li, Fenghuan Li, Maozhong AnAbstract:The combination of chromium-free passivation and nano-electrodeposition was reported to replace chromic acid passivation for electrogalvanized steel. The microstructure, corrosion resistance, scratch resistance and wear resistance of nanocrystalline Zinc Coating after chromium-free passivation were investigated. It was demonstrated that the nanocrystalline Zinc Coating after chromium-free passivation mainly consists of ZnO, Zn3(PO4)2, Ti2O3 and/or (Zn(OH)2, ZnHPO4 and TiO2), which possesses better comprehensive properties than conventional coarse-grained Zinc Coating after commercial trivalent chromium passivation. The reason was also discussed in detail.
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deciphering the formation mechanism of a protective corrosion product layer from electrochemical and natural corrosion behaviors of a nanocrystalline Zinc Coating
RSC Advances, 2015Co-Authors: Qingyang Li, Zhongbao Feng, Wang Ge, Fenghuan Li, Hong Xu, Maozhong AnAbstract:The corrosion resistance improvement of a Zinc Coating with the reduction of grain size from micro to nano-scale has long been attributed to the formation of better protection of the corrosion product layer. However, the formation mechanism of the protective corrosion product layer has rarely been studied. Here nanocrystalline Zinc Coatings are produced by pulse reverse electrodeposition in a sulfate bath with polyacrylamide as the only additive. The electrochemical and natural corrosion behaviors of an electrodeposited nanocrystalline Zinc Coating in comparison with a conventional coarse-grained Zinc Coating in simulated seawater are investigated. The nanocrystalline Zinc Coating exhibits distinctly enhanced corrosion resistance in the simulated seawater compared to the coarse-grained Zinc Coating. The enhanced corrosion resistance of Zinc Coatings with the reduction of grain size from micro (6 μm) to nano-scale (31 nm) is due to the fact that the nanocrystalline Zinc Coating is characterized by a high-volume fraction of grain boundaries, and the Zinc atoms at grain boundaries possess a higher activity. This is beneficial for rapidly forming a protective corrosion product film with a hydrophobic nano-wire structure on the surface of the Zinc Coating during the exposure to simulated seawater, thereby contributing to the corrosion resistance enhancement. Based on analysis results, the possible formation mechanism of a protective corrosion product layer on the surface of the nanocrystalline Zinc Coating is discussed in detail.
Junhe Lian - One of the best experts on this subject based on the ideXlab platform.
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fracture properties of Zinc Coating layers in a galvannealed steel and an electrolytically galvanized steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018Co-Authors: Jinshan He, Junhe Lian, Anke Aretz, Napat Vajragupta, Ude Hangen, F Goodwin, Sebastian MunstermannAbstract:Abstract The Zinc Coating layer fracture properties of a galvannealed steel and an electrolytically galvanized steel are analyzed by conducting the in-situ bending test with newly designed samples. It is found that the fracture develops much earlier in the Coating layers of the galvannealed steel than that of the electrolytically galvanized steel. Using transmission electron microscope and energy dispersive X-ray spectroscopy, the intermetallic phases of the Coating layers are characterized and it is found that the early crack initiation in a galvannealed steel is mainly triggered in the gamma phase. Combining with nanoindentation tests and corresponding simulation, the deformability of intermetallic phases are analyzed to explain the failure behavior of Coating layers in the two steels.
Zhenjun Peng - One of the best experts on this subject based on the ideXlab platform.
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preparation of superhydrophobic Zinc Coating for corrosion protection
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Xiangtai Zhang, Jun Liang, Baixing Liu, Zhenjun PengAbstract:Abstract A superhydrophobic composite layer was successfully fabricated via an electrochemical deposition process and subsequently modified with a polypropylene (PP) film. The surface morphologies and chemical compositions were investigated using scanning electron microscope (SEM) equipped with energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR), respectively. The results showed that the PP modified Zinc deposits had much higher water content angle (170° ± 2°) than the Zinc deposits (120° ± 2°), presenting the wettability behavior from hydrophobic to superhydrophobic performance. The anticorrosion of the superhydrophobic surface was also examined. The findings revealed that the superhydrophobic surface significantly improved the anticorrosion performance of the Zinc deposits.
