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corrosion behavior of Ti60 alloy under continuous NaCl solution spraying at 600℃

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Journal of Materials Science & Technology 2022年第29期124卷 86-101页

作者： Rui li li liu Yu Cui Rui {2. Lei Fan Min Cao Zhongfen Yu Zhiyong Chen Qingjiang wang fuhui wang shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China state key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials CNPC Tubular Goods Research InstituteXi’an 710077China china ENFI Engineering Corp ENFI R&D Institute.Beijing 100038China

The corrosion behavior of Ti60 alloy was investigated under continuous NaCl solution spraying at 600℃.Results indicate that the corrosion rate of the Ti60 alloy is lower than that obtained with the solid NaCl deposit film in HO+*** outer corrosion products are compact layers mainly containing NaTiOand nanocrystalline *** inner layer is mainly composed of TiO,Ti O and *** has a lamellar structure,and TiO has a strip-shaped structure.A mixed corrosion mechanism including classic oxidation and active oxidation occurred under NaCl solution spraying environment:the first stage was controlled by the classic oxidation mechanism with the promotion by the active oxidation following parabolic curves,and the second stage was controlled by the active oxidation mechanism following a linear rise in the mass gain *** mixed corrosion mechanism between classic oxidation and active oxidation produced a relatively dense Ti oxides scale,which decreased the corrosion rate.

关键词： Titanium alloy High temperature corrosion Continuous NaCl solution spraying

Synergetic effect of graphene and Co(OH)2.as cocatalysts of TiO2.nanotubes for enhanced photogenerated cathodic protection

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Journal of Materials Science & Technology 2020年第2期37卷 55-63页

作者： Xiayu Lu li liu Xuan Xie Yu Cui Emeka E.Oguzie fuhui {2. shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Electrochemistry and Materials Science research Laboratory Department of ChemistryFederal University of TechnologyP.M.B.1526OwerriNigeria

A layer of graphene(GR)particles was successfully deposited at the interface between Co(OH)2.nanoparticles and TiO2.nanotubes,aiming to improve the photoelectrochemical performance of the large-bandgap semiconductor *** obtained Co(OH)2.GR/TiO2.was extensively characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),UV–vis absorption spectra and photoluminescence(PL)emission *** impedance spectra,photogenerated potential-time(E-t),photocurrent density-time(i-t)and i-E curves and open circuit potential(OCP)curves were measured to investigate the photoelectrochemical activities and photogenerated cathodic protection *** results revealed that Co(OH)2.GR/TiO2.exhibits excellent photoelectrochemical and photogenerated cathodic performance due to synergistic effect between Co(OH)2.and ***(OH)2.and graphene co-modified TiO2.photoanode could provide an effective protection for 304 stainless steel(304 SS)in 3.5 wt%Na Cl solution for 12.h,which would be promising for future practical app{2.cations in the field of marine corrosion protection.

关键词： TiO2 nanotubes Graphene Co(OH)2 nanoparticles Photoelectrochemical performance Photogenerated cathodic protection

Passivation of corrosion product layer on AM50 Mg by corrosion inhibitor

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Journal of Magnesium and Alloys 2022年第9期10卷 2563-2573页

作者： Yan li Xiaopeng Lu Di Mei Tao Zhang fuhui {2. shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819China School of Materials Science and Engineering and Henan key Laboratory of Advanced Magnesium Alloy Zhengzhou University100 Kexue RoadZhengzhou 450001China

The influence of sodium dodecyl sulfate(SDS)on morphology and chemical composition of corrosion product layer formed onα-Mg matrix and cathodic Al-Mn intermetal{2.c was systematically investigated by using FIB and TEM analysis for the first time to disclose the underlying inhibition mechanism.A porous corrosion bi-layer composed of crystal{2.ne MgO and Mg(OH)_(2.was observed on both ofα-Mg and Al-Mn *** was found that a passive inner layer was deposited onα-Mg after immersion in SDS-containing NaCl solution,which can be ascribed to steady-state growth of magnesium and aluminum oxide under the protection of hydrophobic group of *** inhibition mechanism of the inhibitor was mainly associated with formation of dense oxide layer onα-Mg matrix and preferential adsorption of SDS on the corrosion layer deposited on Al-Mn intermetal{2.c.

关键词： Magnesium TEM FIB Inhibition mechanism

Enamel coating for protection of the 316 stainless steel against tribo-corrosion in molten zinc alloy at 460℃

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Journal of Materials Science & Technology 2021年第6期65卷 126-136页

作者： Zhongdi Yu Minghui Chen Jinlong wang Fengjie li Shenglong Zhu {2. wang shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China institute of metal {2. Chinese Academy of SciencesShenyang 110016China

Hot-dip galvanizing provides excellent corrosion and wear resistance for ***,the equipment itself,such as the steel roller,immerged in corrosive molten zinc suffers serious material loss during steel's *** protection has become the main technique problem in modern galvanizing *** this study,an enamel coating was designed and *** tribo-corrosion in molten zinc alloy(Zn-0.2.wt%Al)at 460℃was investigated in comparison with the traditional WC-12.Co composite coating and the 316 stainless *** indicate that the steel suffers serious material *** corrosion products of Fe_(2. Al_(5) Znx form at the worn surface and the wear scar has reached 2.0μm deep after merely 5 h *** the two coatings provide an improved tribo-corrosion resistance,for the WC-12.Co coating,its chemical reaction with the molten zinc increases brittleness and promotes *** synergistic wear and corrosion cause its *** enamel coating performs better during *** is chemically stable in molten zinc thus able to provide high corrosion *** addition,the amorphous[Si04]network and the self-lubricating CaF_(2. crystallite help it to build up an intact amorphous glaze layer readily at surface on sliding,leading to a reduced wear *** the whole tribo-corrosion process,the enamel coating is completely free of cracking,and the Zn penetration is inhibited.

关键词： Enamel coating High temperature corrosion liquid alloy Corrosive wear

Influence of Sputtered Nanocrystalline Coating on Oxidation and Hot corrosion of a Nickel-based Superalloy M951

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Journal of Materials Science & Technology 2014年第9期30卷 867-877页

作者： Xinyue wang li Xin {2. wang Shenglong Zhu Hua Wei Xiaolan wang School of Materials and metallurgy Northeastern University state key Laboratory for {2. and protection Institute of Metal ResearchChinese Academy of Sciences

The isothermal and cyclic oxidation behaviors in air and hot corrosion behaviors in Na2.O4 ＋ 2. wt% K2.O4 salt of M951 cast superalloy and a sputtered nanocrystalline coating of the same material were studied. Scanning electron microscopy, energy dispersive X-ray spectroscope, X-ray diffraction, and transmission electron microscopy were employed to examine the morphologies and phase composition of the M951 alloy and nanocrystalline coating before and after oxidation and hot corrosion. The as-sputtered nanocrystalline layer has a homogeneous y phase structure of very fine grain size （30-2.0 nm） with the preferential growth texture of （111） parallel to the interface. Adherent AI2.3 rich oxide scale formed on the cast M951 alloy and its sputtered coating after isothermal oxidation at 900 and 1000 ℃. However, when being isothermal oxidized at 1100℃ and cyclic oxidized at 1000 ℃, the oxide scale formed on the cast alloy was a mixture of NiO, NiAl2.4, Al2.3 and Nb2.5 and spalled seriously, while that formed on the sputtered coating mainly consisted of Al2.3 and was very adherent. Nanocrystallization promoted rapid formation of Al2.3 scale during the early stage of oxidation and enhanced the adhesion of the oxide scale, thus improved the oxidation resistance of the substrate alloy. Serious corrosion occurred for the cast alloy. The sputtered nanocrystalline coating apparently improved the hot corrosion resistance of the cast alloy in the mixed sulfate by the formation of a continuous Al2.3 and Cr2.3 mixed oxide layer on the surface of the coating, and the pre- oxidation treatment of the coating led to an even better effect.

关键词： M951 alloy Sputtered nanocrystalline coating Oxidation corrosion Pre-oxidation

Low-valence ion addition induced more compact passive films on nickel-copper nano-coatings

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Journal of Materials Science & Technology 2019年第10期35卷 2144-2155页

作者： Quangquan Do Hongze An Guozhe Meng Weihua li Lai-Chang Zhang Yangqiu wang Bin {2. Junyi wang fuhui wang corrosion and protection Laboratory Key Laboratory of Superlight Materials and Surface Technology(Harbin Engineering University)Ministry of EducationHarbin150001China corrosion and protection {2. School of Chemical Engineering and TechnologySun Yat-Sen UniversityZhuhai519082China corrosion and protection Division Shenyang National Laboratory for Material ScienceNortheastern UniversityShenyang110819China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia Shipbuilding Faculty Viet Nam Maritime UniversityHaiphongViet Nam

Ni-Cu nano-coatings were prepared by pulsed electroplating technique in the baths containing various amount of boric acid. Their microstructure, morphologies and corrosion resistance were characterized in detail. The addition of boric acid strongly influences on the microstructure of the Ni-Cu *** coating with a grain size of 130 nm, obtained from the bath containing 35 g L^-1 boric acid, shows the highest corrosion resistance. This is attributed to the low-valence Cu ion(Cu^+) additions in nickel oxide, which could significantly decrease the oxygen ion vacancy density in the passive film to form a more compact passive film. The higher Cu^+ additions and the lower diffusivity of point defects(D0) are responsible for the formation of more compact passive film on the coating obtained from the bath with 35 g L^-1 boric acid.

关键词： Passive film Point defect corrosion Electroplating Coating

Effect of Cl^- on the Properties of the Passive Films Formed on 316L Stainless Steel in Acidic Solution

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Journal of Materials Science & Technology 2014年第3期30卷 253-258页

作者： Guozhe Meng Yuan li Yawei Shao Tao Zhang Yanqiu wang {2. wang corrosion and protection Laboratory Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University) Ministry of Education state key Laboratory for {2. and protection Institute of Metal Research Chinese Academy of Sciences

The corrosion behavior of 316L stainless steel （31 6L SS） has been investigated in solutions containing various concentrations of chloride ions by using potentiodynamic polarization, capacitance measurement and Mott- Schottky relationship analysis （M-S）. The result indicates that passive currents change slightly with the addition of chloride ions. The pitting potential （Epit） decreases linearly with Iog[CI-]. Correspondingly, the point defect diffusion coefficient （Do） of the passive film increases linearly with increasing Iog[CI-]. The results also indicate that the pitting corrosion of 316L SS follows the adsorption mechanism in NaCI solution.

关键词： 316L stainless steel Passive film Pitting corrosion

Significantly improved corrosion resistance of Mg-15Gd-2.n-0.39Zr alloys: Effect of heat-treatment

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Journal of Materials Science & Technology 2019年第8期35卷 1644-1654页

作者： Jing liu lixin Yang Chunyan Zhang Bo Zhang Tao Zhang Yang li Kaiming Wu fuhui wang The state key Laboratory of Refractories and {2.lurgy Hubei Province Key Laboratory of Systems Science in Metallurgical Process International Research Institute for Steel Technology Wuhan University of Science and Technology 947 Heping Avenue Wuhan 430081 China shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China shenyang National Laboratory for Materials Science Northeastern University 3-11 Wenhua Road Shenyang 110819 China

The effects of heat-treatment on corrosion behavior of Mg-15Gd-2.n-0.39Zr alloys were investigated through microstructure characterization, corrosion tests, and scanning Kelvin probe force microscope(SKPFM) analysis. In long-term corrosion experiments, the corrosion rates of Mg-Gd-Zn-Zr alloys were mainly determined by the effects of micro-galvanic corrosion. During heat-treatment, the β-(Mg,Zn)3Gd eutectic phase in as-cast alloys transformed into a long-period stacking ordered(LPSO) phase, coupled with the precipitation of small precipitates. As heat-treatment proceeded, the local potential and the volume fraction of the LPSO phases reduced gradually compared with the eutectic phase, which resulted in a remarkable decrease of the micro-galvanic effect between the second phase and Mg matrix. As a result, the corrosion resistance of heat-treated alloys improved significantly.

关键词： Mg-Gd-Zn-Zr alloy corrosion behavior Heat-treatment LPSO phase SKPFM

corrosion Behaviors of Nitride Coatings on Titanium Alloy in NaCl-Induced Hot corrosion

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Acta metallurgica Sinica(English Letters) 2021年第10期34卷 1434-1446页

作者： Mingming Zhang Yipeng Feng Yahui wang Yunsong Niu li Xin Yongfeng li Jianxiu Su Shenglong Zhu fuhui wang School of Mechanical and Electrical Engineering Henan Institute of Science and TechnologyXinxiang 453003China corrosion and protection Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchShenyang 110016China corrosion and protection Division Shenyang National Laboratory for Materials ScienceNortheastern UniversityShenyang 110819China

TiN and TiAlN coatings were deposited by arc ion plating on titanium alloys to study their hot corrosion resistance when they were exposed to NaCl at 600℃.The microstructure and corrosion behaviors of nitride coatings were studied using scanning electron microscope,X-ray diffraction,electro-probe microanalyzer and X-ray photoelectron *** results showed that nitride coatings with the different compositions and the ones with the same composition but different thicknesses presented different hot corrosion *** and thin TiAlN coatings showed poor corrosion *** internal oxidation attacked the alloy *** corrosion products were mainly consisted of non-protective TiO2.and sodium *** contrast,the thick TiAlN coating presented outstanding corrosion *** sodium salt,the corrosion products were composed of protective Al_(2.O_(3).The increasing thickness of TiAlN significantly enhanced the hot corrosion *** corrosion mechanisms of alloy,TiN and TiAlN coatings were discussed in detail.

关键词： Titanium alloy Nitride Coating Hot corrosion resistance