Co-reporter:Yaolei Han, En-Hou Han, Qunjia Peng, Wei Ke
Corrosion Science 2017 Volume 121(Volume 121) pp:
Publication Date(Web):1 June 2017
DOI:10.1016/j.corsci.2017.03.004
•Cr-enriched film formed on surface of Alloy 182 by electropolishing (EP).•Lower corrosion rate of electropolished surface (EPS) in high temperature water.•Cr-enriched oxide pit at grain boundary on EPS mitigates the intergranular corrosion.•EP mitigates intergranular stress corrosion cracking of Alloy 182.Effects of changes in surface chemical composition and microstructure by electropolishing on corrosion and stress corrosion cracking (SCC) of Alloy 182 in high temperature water were investigated. The results showed that electropolishing mitigated the corrosion, intergranular corrosion and SCC of Alloy 182. This is attributed to formation of the Cr-enriched, protective oxide on electropolished surface due to the enrichment of Cr by electropolishing. In particular, formation of the protective, blunted oxide at grain boundaries on electropolished surface mitigated the intergranular corrosion and caused a lower SCC susceptibility of Alloy 182.
Co-reporter:Dongxu Chen, En-Hou Han, Xinqiang Wu
Corrosion Science 2016 Volume 111() pp:518-530
Publication Date(Web):October 2016
DOI:10.1016/j.corsci.2016.04.049
•A new device to accurately simulate crevice corrosion in high temperature water was designed.•E-pH diagram, distributions of DO and pH at high temperature were calculated.•Crevice geometry can affect the development of oxide films within the crevice.•DO and pH value within crevice solution were strongly affected by crevice geometry.The new device of crevice corrosion in high temperature water was designed. Effects of crevice geometry on corrosion behavior of 304 stainless steel during crevice corrosion in high temperature water have been investigated. Both width and length of the crevice affect the oxidation behavior of 304 SS. Different crevice widths result in different distributions of dissolved oxygen concentration and eventually affect the development of oxides within the crevice. The crevice length mainly influences the pH value within the crevice solution. The influencing mechanisms of the crevice geometry on oxidation behavior in high temperature water during crevice corrosion are also discussed.
Co-reporter:Daokui Xu, En-hou Han, Yongbo Xu
Progress in Natural Science: Materials International 2016 Volume 26(Issue 2) pp:117-128
Publication Date(Web):April 2016
DOI:10.1016/j.pnsc.2016.03.006
Magnesium alloys containing long period stacking ordered (LPSO) phase have been received a great deal of attention in the last decade owing to their excellent comprehensive properties of mechanical strength and corrosion resistance. In this paper, some fundamental aspects of LPSO containing Mg alloys have been reviewed, including: (1) microstructural characterization, formation conditions and the associated phase transformation of LPSO phases in Mg alloys; (2) deformation mechanism of LPSO phases and their influence on the deformation mechanism of the Mg matrix; (3) effect of LPSO structure on the mechanical performance such as tensile strength, creep resistance, fracture toughness and fatigue strength; (4) corrosion behavior of LPSO containing Mg alloys and their possible applications as the biomaterials. Moreover, some remaining unsolved issues of the LPSO containing Mg alloys and the future target about how to further improve their service properties have been also described.
Co-reporter:Yueling Guo, En-Hou Han, Jianqiu Wang
Journal of Materials Science & Technology 2015 Volume 31(Issue 4) pp:403-412
Publication Date(Web):April 2015
DOI:10.1016/j.jmst.2014.08.014
Microstructure of 316LN stainless steel (ss), including the as-received material and samples processed by solution anneal treatment and stress relief treatment after forging, was characterized by Vickers hardness (HV) testing and electron back scattering diffraction (EBSD). The oxide film formed on samples after immersion in borated and lithiated water at 583.15 K was investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Results showed that the grain size of samples was largely reduced after forging. Higher fraction of coincidence site lattice (CSL) boundaries and lower residual strain were observed in samples with either solution anneal treatment or stress relief treatment. The proportion of CSL boundaries was largely enhanced by solution anneal treatment after forging, due to the recrystallization occurring during solution anneal treatment. The oxide film grown on 316LNss with solution anneal treatment after forging exhibited more strong protectiveness, as compared to the oxide film grown on samples with stress relief treatment after forging and the oxide film grown on as-received samples without forging. The mechanisms of oxidation were then discussed.
Co-reporter:Yingwei Song, En-Hou Han, Kaihui Dong, Dayong Shan, Chang Dong Yim, Bong Sun You
Corrosion Science 2014 Volume 88() pp:215-225
Publication Date(Web):November 2014
DOI:10.1016/j.corsci.2014.07.034
•There are compact surface films formed on the Mg–2Zn and Mg–5Zn alloys in NaCl.•The degradation behavior of the corrosion product films is studied.•The protection ability of the film on Mg–2Zn is superior to that on Mg–5Zn.•Chemical composition and microstructure greatly affect the corrosion product films.The corrosion product films formed on the surface of Mg–2Zn and Mg–5Zn alloys in NaCl solution were investigated by electrochemical measurement, scanning electron microscopy (SEM) observation and X-ray photoelectron spectroscopy (XPS) analysis. It is found that a compact corrosion product film is formed in the initial stage of immersion, and then the film gradually degrades due to dissolution reaction. The product film formed on Mg–2Zn alloy presents better protection property than that on Mg–5Zn alloy, which can be attributed to the different chemical composition and microstructure of the both alloys.
Co-reporter:Yingwei Song, En-Hou Han, Kaihui Dong, Dayong Shan, Chang Dong Yim, Bong Sun You
Journal of Magnesium and Alloys 2014 Volume 2(Issue 3) pp:208-213
Publication Date(Web):September 2014
DOI:10.1016/j.jma.2014.10.002
Hydrogen evolution reaction is inevitable during the corrosion of Mg alloys. The effect of hydrogen on the corrosion behavior of the Mg–2Zn and Mg–5Zn alloys is investigated by charging hydrogen treatment. The surface morphologies of the samples after charging hydrogen were observed using a scanning electron microscopy (SEM) and the corrosion resistance was evaluated by polarization curves. It is found that there are oxide films formed on the surface of the charged hydrogen samples. The low hydrogen evolution rate is helpful to improve the corrosion resistance of Mg alloys, while the high hydrogen evolution rate can increases the defects in the films and further deteriorates their protection ability. Also, the charging hydrogen effect is greatly associated with the microstructure of Mg substrate.
Co-reporter:Y.H. Kang, D. Wu, R.S. Chen, E.H. Han
Journal of Magnesium and Alloys 2014 Volume 2(Issue 2) pp:109-115
Publication Date(Web):June 2014
DOI:10.1016/j.jma.2014.01.010
The effect of trace addition of 0.2 wt.% Zn on the microstructures and mechanical properties of the age-hardening Mg–4.2Y–2.5Nd–1Gd–0.6Zr (wt.%) (WE43) alloy has been investigated. As compared with the WE43 alloy after solid solution treatment at 525 °C, the block-like Zn–Zr phase was still observed in the WE43-0.2Zn alloy. However, the time for WE43-0.2Zn alloy to get peak hardness at 250 °C was two hours, a half earlier than that in WE43 alloy, meaning a accelerated age precipitation kinetics has been achieved due to the addition of 0.2 wt.% Zn. Microalloyed with 0.2 wt.% Zn enhanced the ultimate tensile strength (UTS) slightly and ductility significantly both in the solutionized and peak aged condition. The enhancement in strength and ductility is possible associated with the larger volume fraction of precipitation phases due to a reduction of the solubility of rare earth elements (RE) in the α-Mg matrix, the larger aspect ratio (length to width) of precipitates and a decrease in stacking fault energy by addition of Zn.
Co-reporter:Yingwei Song, En-Hou Han, Kaihui Dong, Dayong Shan, Chang Dong Yim, Bong Sun You
Corrosion Science 2013 Volume 72() pp:133-143
Publication Date(Web):July 2013
DOI:10.1016/j.corsci.2013.03.021
•The oxide films on Mg–xZn alloys consist of similar chemical composition.•The higher Zn content results in the thicker but higher defect of the oxide films.•The oxide films exhibit different protection performance under various potentials.The naturally formed oxide films on Mg–2Zn and Mg–5Zn alloys were investigated by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. The oxide films on the both alloys present a similar chemical composition, consisting of surface layer of basic magnesium carbonate and MgO following with MgO and ZnO, but the oxide film on Mg–5Zn is thicker and contains more defects. The protection performance of the oxide film on Mg–5Zn is worse under open circuit potential but better in a suitable anodic potential scope compared with that on Mg–2Zn alloy.
Co-reporter:Yongsheng Hao, Fuchun Liu, En-Hou Han
Progress in Organic Coatings 2013 Volume 76(Issue 4) pp:571-580
Publication Date(Web):April 2013
DOI:10.1016/j.porgcoat.2012.11.012
Polyaniline (PANI) was covered on the surface of ultra-short glass fibers uniformly by in situ polymerization of aniline. Epoxy coatings with different contents of PANI ultra-short glass fibers and ultra-short glass fibers were formulated and their protection abilities were evaluated by means of open-circuit potential, electrochemical impedance spectroscopy and salt spray test. The results showed that the PANI ultra-short glass fibers had a significant inhibitive effect and its best volume fraction was10% in epoxy coating. XPS results indicated that a dense, stable passive oxide film of Fe2O3/Fe3O4 was formed on the steel surface beneath the coating.Highlights► The ultra-short glass fibers surface has been covered a layer of polyaniline. ► PANI ultra-short glass fibers have corrosion inhibition effect. ► A passive oxide film was formed on the steel surface beneath the coating.
Co-reporter:Yingwei Song, En-Hou Han, Dayong Shan, Chang Dong Yim, Bong Sun You
Corrosion Science 2012 Volume 65() pp:322-330
Publication Date(Web):December 2012
DOI:10.1016/j.corsci.2012.08.037
The effect of Zn concentration on the corrosion behavior of Mg–xZn alloys is investigated. The microstructure is observed by scanning electron microscopy (SEM). The corrosion resistance is evaluated by electrochemical and immersion tests. The initiation and propagation of corrosion are analyzed based on the electrochemical measurements and corrosion morphologies observation. It is found that the MgxZny second phases are precipitated on the boundaries and their volume fractions rise with increasing Zn concentration. As a result, the corrosion resistance of Mg–xZn alloys reduces with increasing Zn concentration, which is greatly associated with the micro-cathodic effect of the MgxZny second phases.Highlights► The corrosion resistance of Mg–xZn alloys reduces with increasing Zn content. ► The corrosion of Mg–5Zn preferentially initiates from other precipitation phases. ► The MgxZny second phases play a key role in the propagation stage of corrosion. ► The very fine MgxZny second phases dominate the corrosion around the boundaries.
Co-reporter:D.K. Xu, E.H. Han
Progress in Natural Science: Materials International 2012 Volume 22(Issue 5) pp:364-385
Publication Date(Web):October 2012
DOI:10.1016/j.pnsc.2012.09.005
Icosahedral phase (I-phase) is a relatively excellent strengthening phase in Mg alloys. Depending on their volume fraction, the yield strength of Mg–Zn–Y–Zr alloys can vary from 150 to 450 MPa at room temperature. Recently, the formation of I-phase has been considered as one of the most effective methods for developing high strength lightweight Mg alloys for automotive and aerospace applications. In this review article, a series of research work about I-phase containing Mg alloys have been systematically investigated including I-phase formation mechanism and their effects on mechanical properties of Mg alloys. Particular emphases have been given to: (1) Structure of I-phase and its orientation relationship with the α-Mg matrix. (2) Influence of alloying elements and solidification conditions on I-phase formation. (3) Effects of I-phase on microstructural evolution and mechanical improvement of Mg–Zn–Y–(Zr) alloys. Moreover, the applications of I-phase for the mechanical improvement of other Mg alloys such as AZ91 and super-lightweight Mg–Li alloys are also reviewed.
Co-reporter:Wenjun Kuang, En-Hou Han, Xinqiang Wu, Jiancun Rao
Corrosion Science 2010 Volume 52(Issue 11) pp:3654-3660
Publication Date(Web):November 2010
DOI:10.1016/j.corsci.2010.07.015
The microstructural characteristics of oxide scale formed on type 304 stainless steel in oxygenated high temperature water have been investigated. From outer to inner layer, the oxide scale consists of faceted spinel particles, irregularly shaped hematite particles and a compact layer of nano-sized spinels. Some outmost spinels formed on top of other particles are depleted in Cr, while the hematite particles tightly embedded into the inner layer contain more Cr in the inner than in the outer part. The inner nano-sized oxide grow inwards directly from the bottom of outer particles. The related oxidation mechanism is discussed.
Co-reporter:Hongwei Shi, Fuchun Liu, Enhou Han
Materials Chemistry and Physics 2010 Volume 124(Issue 1) pp:291-297
Publication Date(Web):1 November 2010
DOI:10.1016/j.matchemphys.2010.06.035
The corrosion behaviour of the sol–gel coatings doped with cerium chloride or cerium nitrate on 2024-T3 aluminum alloy was investigated by using electrochemical impedance spectroscopy (EIS) and immersion tests. The sol–gel matrix was obtained through hydrolysis, condensation of 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetramethoxysilane (TMOS), using diethylentriamine as curing agent. The results indicated that cerium nitrate with concentration of 1 × 10−3 mol L−1 in the silane solution was excellent on self-healing for the sol–gel coating, while cerium chloride had no obvious effect. This result suggested that the introduction of Cl− promoted the under-film pitting of 2024-T3 substrate. It was found that Ce(OH)3 and Ce(OH)22+ simultaneously existed in the silane solution by X-ray diffraction (XRD) analysis. Ce(OH)22+ transformed to CeO2 due to high-temperature curing of sol–gel matrix demonstrated by X-ray photoelectron spectroscopy (XPS) analysis. Therefore, it can be considered that Ce(OH)3 and CeO2 played inhibition roles in the corrosion process of the sol–gel coatings.
Co-reporter:Zhenyu Wang, Enhou Han, Fuchun Liu, Wei Ke
Journal of Materials Science & Technology 2010 Volume 26(Issue 1) pp:75-81
Publication Date(Web):January 2010
DOI:10.1016/S1005-0302(10)60012-6
The nano-concentrates and flame retardant nano-coating were prepared in thhis study. The effect of nano-SiO2 on the corrosion resistance and fire resistance of ammonium polyphosphate-pentaerythritol-melamine (APP-PER-MEL) coating was investigated by differential thermal analysis (DTA), scanning electron microscopy (SEM), effective thermal conductivity (λ/d), X-ray photoelectron spectroscopy (XPS) and fire protection test. The chemical action and endothermic effect of ammonium polyphosphate, pentaerythritol and melamine in traditional flame retardant coating were damaged by salt spray condition, whereas the flame-retardant additives in the nano-coating demonstrated the good chemical interaction in salt spray condition. The uniformly dispersed nano-SiO2 particles could improve corrosion resistance of the coating, and hence nano-coating could remain the good fire-resistant properties even after 500 h salt spray test.
Co-reporter:Jian Chen, Meirong Ai, Jianqiu Wang, En-Hou Han, Wei Ke
Materials Science and Engineering: A 2009 Volume 515(1–2) pp:79-84
Publication Date(Web):25 July 2009
DOI:10.1016/j.msea.2009.02.047
The stress corrosion cracking (SCC) behaviors of as-cast AZ91 magnesium alloy in deicer solutions were investigated using constant load. When deicer concentration was 0.5 M, the critical stress threshold was about one third of yield strength of AZ91 alloy; when deicer concentration decreased to 0.005 M, the critical stress threshold would increase to three forth of yield strength. In deicer solutions, hydrogen embrittlement (HE) was the main mechanism for the SCC of AZ91 alloy.
Co-reporter:D.K. Xu, L. Liu, Y.B. Xu, E.H. Han
Acta Materialia 2008 Volume 56(Issue 5) pp:985-994
Publication Date(Web):March 2008
DOI:10.1016/j.actamat.2007.10.057
Abstract
The fatigue behavior of as-cast Mg–12%Zn–1.2%Y–0.4%Zr alloy has been investigated. The S–N curve showed that the fatigue strength at 107 cycles was 45 MPa. Scanning electron microscopy observations on the surfaces of the failed and unfailed specimens (after up to 1 × 107 cycles) suggested that the slip bands could act as preferential sites for non-propagating fatigue crack initiation, and the I-phase could effectively retard fatigue crack propagation (FCP). The macro fracture morphology clearly indicated that the overall fracture surface was composed of three regions, i.e. a fatigue crack initiation region (Region 1), a steady crack propagation region (Region 2) and a tearing region (Region 3). High-magnification fractographs showed that only porosities can act as the crack initiation sites for all specimens. Moreover, for specimens with fatigue lifetimes lower than 2 × 105 cycles, the cracks mostly initiated at the subsurface or surface of the specimen. However, when the fatigue lifetime was equal to or higher than 2 × 105 cycles, the fatigue crack initiation sites transferred to the interior of the specimen. The maximum stress intensity factors corresponding to the transition sites between Regions 1, 2 and 3 were 2 and 4.2 MPa m1/2, respectively. When the maximum stress intensity factor Kmax was lower than 4.2 MPa m1/2, in the steady crack propagation region, due to the retarding effect of I-phase/α-Mg matrix interfaces, the fatigue cracks tended to pass the I-phase/α-Mg matrix eutectic pockets directly and propagated through the grain cells, resulting in the formation of many flat facets on the fracture surface. However, when the maximum stress intensity factor was higher than 4.2 MPa m1/2, in the sudden failure region, the rigid bonding of I-phase/α-Mg matrix interfaces was destroyed and the cracks preferentially propagated along the interfaces, which resulted in the fracture surface being almost completely composed of cracked I-phase/α-Mg matrix eutectic pockets. Based on microstructural observation and the fracture characteristics of the two regions, it is suggested that with an increase in crack tip driving force, the FCP mode changes from transgranular propagation to intergranular propagation.
Co-reporter:Hongwei Shi, Fuchun Liu, Lihong Yang, Enhou Han
Progress in Organic Coatings 2008 Volume 62(Issue 4) pp:359-368
Publication Date(Web):June 2008
DOI:10.1016/j.porgcoat.2007.11.003
Nano-TiO2 particles was uniformly dispersed and prepared into concentrated nano-paste. The effects of nano-TiO2 particles on the performance of epoxy resin on 2024-T3 aluminum alloy were investigated. The effects of nano-SiO2 with γ-glycidoxypropyltrimethoxy silane modification or without modification on the performance of epoxy resin were also studied. It was found that the hardness of epoxy resin was improved by the incorporation of 1 wt.% nano-TiO2 particles or nano-SiO2. The results of electrochemical impedance spectrum (EIS) and salt spray test indicated that the addition of nano-TiO2/SiO2 significantly improved the corrosion resistance of epoxy resin. Fourier transform infrared spectra (FT-IR) proved that the new absorptions at 1070 and 1090 cm−1 on silane-treated nano-SiO2 particles, which can evidence the ring structure of SiOSi. The formation of layered ring structure of nano-SiO2 can be explained for the enhancement of the corrosion resistance and hardness of nano-SiO2/epoxy composite.
Co-reporter:D.K. Xu, W.N. Tang, L. Liu, Y.B. Xu, E.H. Han
Journal of Alloys and Compounds 2008 Volume 461(1–2) pp:248-252
Publication Date(Web):11 August 2008
DOI:10.1016/j.jallcom.2007.07.096
This work mainly investigated the mechanical properties of as-cast Mg–Zn–Y–Zr Mg alloys with Zn/Y ratio about 0.97. Tensile results show that when Zn/Y ratio is constant, the alloy (with Zn and Y contents of 3.93 and 4.14 wt.%, respectively) has the highest strength. XRD analysis shows that the alloys are mainly composed of α-Mg matrix and W-phase. With the contents of Zn and Y increasing, the diffraction peaks of W-phase are gradually intensified. In addition, microstructure observation indicates that with the increase of Zn and Y contents, the grain boundaries are gradually coarsened by W-phase. Based on the microstructure observation and fracture analysis, the change of the mechanical properties has been explained.
Co-reporter:D.K. Xu, L. Liu, Y.B. Xu, E.H. Han
Scripta Materialia 2008 Volume 58(Issue 12) pp:1098-1101
Publication Date(Web):June 2008
DOI:10.1016/j.scriptamat.2008.02.013
The mechanical anisotropy of as-extruded Mg–Zn–Zr plate has been investigated. It indicated that the critical resolve shear stress (CRSS) for basal slip was 60 MPa. Based on macro-shear fracture angles and deformed microstructure, it suggested that for samples with tilt angle β between 30° and 60°, the plastic deformation should rely on basal slip, whereas for samples with tilt angle β greater than 60°, the plastic deformation should be dominated by {1 0 1¯ 2} twinning.
Co-reporter:R.F. Zhang, D.Y. Shan, R.S. Chen, E.H. Han
Materials Chemistry and Physics 2008 Volume 107(2–3) pp:356-363
Publication Date(Web):15 February 2008
DOI:10.1016/j.matchemphys.2007.07.027
The effects of electric parameters including frequency, duty cycle, current density and final voltage on properties of anodic coatings formed on AZ91HP magnesium alloys were systematically investigated using the orthogonal experiment of four factors with three levels. The effect order of factors on the corrosion resistance of anodized Mg alloys was ranked as final voltage > frequency > duty cycle > current density, while the sequence on the coating thickness was final voltage > current density > duty cycle > frequency. The porosity of anodic coatings was increased with an increase of final voltage, but decreased with an improvement of frequency. The electric parameters applied affected the corrosion resistance mainly by influencing the coating thickness and surface morphology.
Co-reporter:D.K. Xu, L. Liu, Y.B. Xu, E.H. Han
Scripta Materialia 2007 Volume 57(Issue 3) pp:285-288
Publication Date(Web):August 2007
DOI:10.1016/j.scriptamat.2007.03.017
Through investigating the mechanical properties of three kinds of Mg–Li–Zn–Y alloys, a strengthening method, i.e. introducing I-phase (Mg3Zn6Y, icosahedral quasicrystal structure) in the matrix of Mg–Li alloys, for as-extruded Mg–Li alloys has been demonstrated. The tensile results indicate that I-phase can effectively strengthen the alloys. The substantial enhancement of strength has been explained by microstructure changes.
Co-reporter:L.H. Yang, F.C. Liu, E.H. Han
Progress in Organic Coatings 2005 Volume 53(Issue 2) pp:91-98
Publication Date(Web):1 June 2005
DOI:10.1016/j.porgcoat.2005.01.003
The effect of the pigment/binder ratio (P/B) on the corrosion resistance properties of polyurethane paints on carbon steel was investigated by ac impedance techniques. Painted steel electrodes were studied during exposure to 3.5% NaCl solution for up to 1000 h. Two series of polyurethane paints were used: conventional ZnO or nano-ZnO as pigments. The results showed that the corrosion resistance is affected by the P/B ratio, the optimum amount of zinc oxide of conventional zinc oxide (P/B = 1) is more than that of nano-zinc oxide (P/B = 0.3). Therefore, better anticorrosive protection is achieved by the coatings pigmented with nano-ZnO and a lesser amount of nano-ZnO is required.
Co-reporter:Lijin Dong, En-Hou Han, Qunjia Peng, Wei Ke, Lei Wang
Corrosion Science (March 2017) Volume 117() pp:
Publication Date(Web):March 2017
DOI:10.1016/j.corsci.2016.12.011
•Studied environmentally assisted crack growth in 308L weld metal in primary water.•Ultra-low stress corrosion crack growth rate (CGR) of 308L weld metal.•Water chemistry and cyclic loading parameters affect the corrosion fatigue (CF) CGR.•CF CGR of 308L weld metal is lower than that of other austenitic stainless steels.•Low CF CGR of 308L weld metal is attributed to the retardation effect of δ ferrite.Environmentally assisted crack growth behavior of 308L stainless steel weld metal in simulated primary water was investigated. The results showed ultra-low stress corrosion crack growth in the weld metal. However, obvious environmental acceleration of fatigue crack growth was observed, which is increased by more aggressive water chemistry and gentle cyclic loading conditions. Further, the environmental fatigue crack growth rate of 308L weld metal was lower than that of 304 and 316 stainless steels under the same environmental and loading conditions. This was attributed to the retardation of crack growth by δ ferrite phase.
Co-reporter:Hongwei Shi, Fuchun Liu, Lihong Yang, Enhou Han
Progress in Organic Coatings (June 2008) Volume 62(Issue 4) pp:359-368
Publication Date(Web):1 June 2008
DOI:10.1016/j.porgcoat.2007.11.003
Nano-TiO2 particles was uniformly dispersed and prepared into concentrated nano-paste. The effects of nano-TiO2 particles on the performance of epoxy resin on 2024-T3 aluminum alloy were investigated. The effects of nano-SiO2 with γ-glycidoxypropyltrimethoxy silane modification or without modification on the performance of epoxy resin were also studied. It was found that the hardness of epoxy resin was improved by the incorporation of 1 wt.% nano-TiO2 particles or nano-SiO2. The results of electrochemical impedance spectrum (EIS) and salt spray test indicated that the addition of nano-TiO2/SiO2 significantly improved the corrosion resistance of epoxy resin. Fourier transform infrared spectra (FT-IR) proved that the new absorptions at 1070 and 1090 cm−1 on silane-treated nano-SiO2 particles, which can evidence the ring structure of SiOSi. The formation of layered ring structure of nano-SiO2 can be explained for the enhancement of the corrosion resistance and hardness of nano-SiO2/epoxy composite.
Co-reporter:Mingcheng SUN, Fuchun LIU, Hongwei SHI, Enhou HAN
Acta Metallurgica Sinica (English Letters) (February 2009) Volume 22(Issue 1) pp:27-34
Publication Date(Web):February 2009
DOI:10.1016/S1006-7191(08)60067-8
