F.J. Shan
,
C.S. Liu
,
S.H. Wang
,
G.C. Qi
金属学报(英文版)
The corrosion behavior of hot dip galvanized steel
pretreated with bis-[triethoxy-\linebreak\noindent silylpropyl]
tetrasulfide (BTESPT) modified with alumina particles was studied.
The corrosion resistance of the passiving films was evaluated by
Tafel polarization curve and electrochemical impedance spectroscopy.
The films formed on the galvanized steel substrate were
characterized by Fourier transform infrared spectroscopy and energy
dispersive X-ray spectrometry. The surface morphology of the treated
hot dip galvanized steel samples was observed by Field Emission
Scanning Electron Microscope. The results show that the
pretreatments on the basis of silane films modified with nanoalumina
particles have reduced both anodic and cathodic current densities,
and increased total impedance in the measured frequency,
consequently, improving corrosion protection for hot dip galvanized
steel during immersion in NaCl solutions compared to chromate films
and silane films.
关键词:
Bis-sulfursilane
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null
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null
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null
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null
S.H. Wang
,
C.S. Liu
,
F.J.Shan
,
G.C. Qi
金属学报(英文版)
The amino-tri-(methylenephosphonic acid) layers were adsorbed on the surface of AA6061 aluminum alloy for improving the lacquer adhesion and corrosion inhibition as a substitute for chromate coatings. The surface structure and characteristic of the amino-tri-(methylenephosphonic acid) layers on AA6061 aluminum alloy were investigated by means of XPS and ATR-FTIR analysis. The analyzed results showed that the amino-tri-(methylenephosphonic acid) adsorption layers adsorb on the surface of aluminium alloy $via$ acid-base interaction in a bi-dentate conformation. After the amino-tri-(methylenephosphonic acid) layers were coated with epoxy resin, the layers showed good adhesive strength and favorable corrosion resistance in contrast to
chromate coatings.
关键词:
Amino-tri-(methylenephosphonic acid)Layer
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null
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null
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Y.L. Yang
,
C.S. Liu
,
F.J. Sun
,
D. Zhang
金属学报(英文版)
CW-CO2 laser nitriding technique was applied to improve the properties (such as aging property and the core loss) of grain oriented silicon steel. The samples were nitrided with regular space. Laser power density and scanning speed were chosen as 7.8×105W·cm-2 and 100mm·min-1. By some laser irradiation, Fe4N and Fe3N were formed in the nitrided zone. The nitrided samples were annealed at the temperatures ranged from 100 to 900°C. The core loss of some interested samples was tested. The results show that the core loss of the nitrided samples with different thickness of 0.23 and 0.30mm decreased by 14.9% and 9.4% respectively, and the aging property were improved up to 800°C. The mechanism of laser nitriding to improve the properties of grain oriented silicon steel is discussed.
关键词:
laser nitriding
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null
,
null
