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Li G.F.,Shanghai Key Laboratory for Engineering Materials Evaluation | Yan D.F.,A+ Network
Advanced Materials Research

The effects of soil type of Shanghai and electrode potential from cathodic protection point on near-neutral pH stress corrosion cracking (SCC) behavior of pipeline steel X60 has been investigated for structural integrity assessment. The SCC behavior was evaluated through slow strain rate tests (SSRT) at various electrode potentials in three solutions containing different typical soils. Results showed that the SCC susceptibility generally increased with decreasing electrode potential in all the three environments, with quick increase happening in the range from -1500 to -700mV(SCE). It is suggested that hydrogen induced cracking should dominate the SCC at low potentials. In cathodic potential range, the rank of the SCC susceptibility for soil type was Near-city soil > Cyan-purple soil > Cyan-yellow soil. In anodic potential range, SCC susceptibility curves mixed each other in the three solutions. © (2014) Trans Tech Publications, Switzerland. Source

Zhai L.,University of Shanghai for Science and Technology | Zhou H.,University of Shanghai for Science and Technology | Li X.,Shanghai Key Laboratory for Engineering Materials Evaluation | Gu Z.,Shanghai Key Laboratory for Engineering Materials Evaluation | Chen L.,Shanghai Institute of Space Power Sources
Corrosion Science and Protection Technology

A novel etching process of indium tin oxide (ITO) transparent electrode and its etching effect were reported. Etching liquid was made up of FeCl3 solution with various pH as functional component, PEG10000 as medium, and gas phase SiO2 as thixotropic agent. ITO etching experiments were carried out by screen printing method. The influence of different etching conditions on ITO electrode volume resistivity was studied. The result shows that the optimal etching condition is etching at 80 °C for 90 min in a solution with pH 1.67. The change of composition and morphology of ITO electrode was characterized by EDS and AFM respectively. Source

Gu Z.-M.,Shanghai Key Laboratory for Engineering Materials Evaluation | Li X.-H.,Shanghai Key Laboratory for Engineering Materials Evaluation | Hu X.-X.,East China University of Science and Technology | Bao H.,East China University of Science and Technology
Gongneng Cailiao/Journal of Functional Materials

Synthesized graphite oxide(GO)/multi-wall carbon nanotubes(MWNTs) hybrid material with good conductive performance. The hydrogen bonding between GO layers in the hybrid material was subsided when the content of MWNTs was increased, and interlayer spacing of GO was enlarged proved by IR, Raman spectra and X-ray diffraction. The intersecting surface and surface images of hybrid material were observed by SEM, it showed that the original heaped GO layer-structure happened to exfoliate when MWNTs inserted, and MWNTs had a good dispersion in hybrid material. When the ration of GO and MWNTs charged 1:4 from 1:1, the conductivity increased by 5 orders of magnitude. Source

Li G.F.,Shanghai Key Laboratory for Engineering Materials Evaluation | Yuan Y.F.,Shanghai Key Laboratory for Engineering Materials Evaluation | Lu X.,Shanghai Key Laboratory for Engineering Materials Evaluation
Procedia Engineering

The microstructure and stress corrosion cracking (SCC) in simulated primary water at 290 °C of a dissimilar metal weld 16MND5/309L/308L/Z2CND18-12N made in China were studied for reliability and lifetime assessment and management of relevant pressurized water reactor (PWR) nuclear power plants. Results of microstructure characterization showed that the base metal of the low alloy steel (LAS) 16MND5 was upper-bainitic and stainless steel (SS) Z2CND18-12N was equiaxial austenitic grains, the bulk weld metal of SS 308L was austenite with dendritic structures plus δ-ferrite islands. The interfaces areas around 16MND5/309L and 308L/Z2CND18-12N exhibited apparent fusion lines with complicated microstructure/chemical composition changes, especially the former. The area between the 16MND5 base metal and the bulk weld metal was made up of three parts, that is, the heat-affect zone of 16MND5, fusion line and transition zone. There was a thin martensitic layer along the fusion line, which possessed the highest micro-hardness among the weld. The transition zone was an austenitic layer within which Cr% and Ni% changed significantly. SCC test results showed that this area around 16MND5/309L was the most susceptible to SCC among the weld. Both intergranular and transgranular SCC occurred in this area when tested in at high electrode potential which is mainly related to bad water chemistry with high oxygen contamination. The crack mechanism and the significance in engineering are discussed. © 2015 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license. Source

Lu Q.-S.,Fudan University | Sun L.-H.,Fudan University | Yang Z.-G.,Fudan University | Li X.-H.,Shanghai Key Laboratory for Engineering Materials Evaluation | And 2 more authors.
Composites Part A: Applied Science and Manufacturing

In order to obtain an optimal PU based polyester fabric composites orienting to applications, the composites with different ratios of bi-component PU adhesive and different structural inorganic fillers were fabricated and characterized thermally and mechanically, and the mechanisms were theoretically discussed in details; in particular, the tensile performances with different loading directions have also been studied. In the present approach, the ratios of bi-component PU adhesive, the fillers as well as the loading directions were comprehensively investigated and optimized to get the best tensile performance under constraint of the thermal properties. All the results of tensile testing have been explained by the proposed "crack propagation and encountering mechanism" which can identify the strengths of interfaces, matrixes and fibers and describe the initiation and propagation of the cracks inside the composites. © 2010 Elsevier Ltd. All rights reserved. Source

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