X.G
,
Yang
,
Q.A. Zhang
,
K. Y Shu
,
YL. Du
,
YQ. Lei and Q.D. Wang (Department of Materials Science and Engineering
,
Zhejiang University
,
Hangzhou 310027
,
China )W.K. Zhang(Department of Applied Chemistry
,
Zhejiang University of Technology
,
Hangzhou 3100l4
,
China )G.L. Lu(Central Lab
,
Zhejiang University
,
Hangzhou 310028
,
China)
金属学报(英文版)
The annealing treatment was found to improve the cyclic stability but to degmde discharpe capacity, activation and high-rate discharpeability for the Ti-substituted AB2type alloy electrode. A larper polarization was found in the annealed alloy because of its poor discharpe kinetics resulted hem the structural homogeneity. At larae discharpe cumnts, the hydmpen dchsion in the bulk of the alloy was mpaofed as the mte-determining step. Based on the P ressure-composition isotherm measurement, we concluded that the decrease in discharpeability of the annealed alloy is owing to the low and flat pressure plateau, as well as the large hysteresis, but the hydrgen stomge density almost remains unchangeable after annealing.
关键词:
AB_2
,
null
,
null
,
null
,
null
,
null
X.G. Yang
,
K. Y. Shu
,
X.B. Zhang
,
Y.Q. Lei and Q.D. Wang(Department of Materials Science and Engineering
,
Zhejiang University
,
Hangzhou 310027
,
China)W. K. Zhang(College of Applied Chemistry
,
Zhejiang University of Technology
,
Hangzhou 310014
,
China)G.L. Lu(Centre of Analysis and Mesurement
,
Hangzhou University
,
Hangzhou 310028
,
China)
金属学报(英文版)
The effect of La alloying on the crystalline characteristics, electrochemical capacity and activity of AB2 type Zr-Cr-Ni hydride electrodes was investigated. It was found that La alloying was able to shorten the activating process from 15 cycles of La-free alloy to 2 cycles, and that the main phase shifts from C14 to C15 by XRD analysis. It may be attributed to the modification of surface chemical states and change in internal microstructures. However, the cycling stability was also found to degrade severely for La-containing hydride electrode because of the collapse of its distorted lattice.
关键词:
Zr-Cr-Ni hydrogen storage alloy
,
null
,
null
J.S.Lu 1)
,
I.Odneval 2) and C.Leygraf 2) 1) College of Chemical Engineering
,
Zhejiang University of Technology
,
Hangzhou 310032
,
China 2) Department of Material Science and Engineering
,
Royal Institute of Technology
,
Stockholm
,
100 44
,
Sweden
金属学报(英文版)
Atmospheric corrosion of 304 and 316 stainless steels was studied by field exposure test, in which rain water was collected and analyzed by atomic absorption spectroscope (AAS). Emphasis was put on the dissolution of chromium and nickel from the stainless steels by atmospheric corrosion and rain runoff. AAS analyses shows that the amounts of yearly chromium and nickel dissolution were less than 150ng/cm 2 and 50ng/cm 2 respectively for both 304 and 316 stainless steels. XPS analysis reveals the marked Cr enrichment on the 316 stainless steel after one year field exposure. SEM shows the morphology of corrosion pits on the steel surfaces.
关键词:
atmospheric corrosion
,
null
,
null
,
null
