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Your search keyword '"Zhiyi Liu"' showing total 2 results
Start Over Author "Zhiyi Liu" Topic aluminum alloy Publication Year Range Last 10 years
2 results on '"Zhiyi Liu"'

1. Corrosion Resistance of Epoxy Coatings Modified by Bis-Silane Prepolymer on Aluminum Alloy

Author

Lihua Zou, Haijiang Wu, Diping Zeng, and Zhiyi Liu

Subjects
Materials science, bis-silane prepolymer, Alloy, Double-layer capacitance, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Corrosion, chemistry.chemical_compound, Coating, Materials Chemistry, silane-epoxy coatings, Composite material, Prepolymer, EIS, Silanes, Surfaces and Interfaces, Epoxy, Engineering (General). Civil engineering (General), 021001 nanoscience & nanotechnology, Silane, 0104 chemical sciences, Surfaces, Coatings and Films, chemistry, visual_art, engineering, visual_art.visual_art_medium, TA1-2040, aluminum alloy, 0210 nano-technology
Abstract

In this communication, a bis-silane prepolymer was used to modify epoxy resin, aiming to enhance the corrosion resistance of epoxy coatings on aluminum alloy substrates. The bis-silane prepolymer was prepared by tetraethoxysilane (TEOS) and γ-glycidoxypropyl trimethoxysilane (GPTMS). The corrosion behavior of silane-epoxy coatings was studied. Compared with silane monomer-modified epoxy coatings, bis-silane-modified epoxy coatings have lower coating capacitance (Cc), higher charge transfer resistances (Rdl), and lower double layer capacitance (Cdl) during long-time immersion. It indicates that bis-silane-modified epoxy coating has stronger waterproof permeability and substrate corrosion protection ability. In addition, due to the leaching of the silane component and cross-linking reaction between different silanes during the immersion process, the bis-silane-modified epoxy coatings exhibit much stronger “self-healing” ability.

Published
2021

2. Effects of germanium on quench sensitivity in Al-Zn-Mg-Zr alloy.

Author

Lianghua Lin, Zhiyi Liu, Song Bai, Puyou Ying, and Xiaohu Wang

Subjects
*ALUMINUM alloys, *QUENCHING (Chemistry), *TRACE elements, *GERMANIUM, *SOLID solutions, *BEARINGS (Machinery), *HIGH temperatures
Abstract

Effects of the trace element germanium (Ge) on the quench sensitivity of an Al-Zn-Mg-Zr alloy were investigated in the present work. The results showed that the Ge-bearing alloy exhibited lower quench sensitivity as compared to the Ge-free alloy. This phenomenon could be reasonably interpreted in terms of the stability of supersaturated solid solution of alloys after quenching from an elevated temperature. The apparent vacancy formation energies for the Ge-free and Ge-bearing alloys were determined to be 0.49 and 0.58 eV respectively. This suggested that the addition of a small amount of Ge was able to trap excess vacancies, leading to a decrease in the amount of coarse dispersoids and resultant low quench sensitivity in Ge-bearing alloys. Therefore, Ge could be used in alloy productions, which require a slow cooling rate to reduce the residual stresses and distortions. [ABSTRACT FROM AUTHOR]

Published
2015
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