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Chemical and Electrochemical Characterization of Artifi cial Sulphate Patina on Bronze

Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 585-589页

作者：毛样武 NIE Dunwei mombello domenico Key Laboratory of Plasma Chemistry and Advanced Materials of Hubei Province Wuhan Institute of Technology Department of Applied Science and Technology Politecnico di TorinoTorino 10129 Italy

Copper patinas are generally regarded as aesthetically pleasing and are supposed to protect copper against further corrosion. The preparation of artificial sulphate patina on bronzes has been realized by immersing the bronze into CuSO4 solution. The effect of immersion time on the formation of the patina has been investigated. The sulphate patina obtained with immersion time of 500 h in CuSO4 solution consists of fiat area and crystals. The flat area in the patina is mainly made of cuprite, whereas the crystals are mainly composed of brochantite. The electrochemical measurement of sulphate patina in simulated acid rain with pH 3.1 shows that the protective effectiveness of patina decreases with time and the dissolution of patina is the key factor leading to the degradation of patina. The investigation of the formation mechanism of sulphate patina shows that the cuprite layer forms on the surface of bronze in the initial patination. Then, crystal brochantite grows on the surface of cuprite by the oxidation of cuprite and the incorporation of CuSO4 solution.

关键词： artificial sulphate patina bronze electrochemical characterization

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Tarnish Testing of Copper-Based Alloys Coated with SiO_2-Like Films by PECVD

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Plasma Science and Technology 2014年第5期16卷 486-490页

作者：毛样武郭贝贝聂敦伟 domenico mombello Key Laboratory of Plasma Chemistry and Advanced Materials of Hubei Province Wuhan Institute of Technology Department of Applied Science and Technology Politecnico di Torino

The tarnishing test in the presence of hydrogen sulfide（H2S） vapors has been used to investigate the tarnish resistance capability of copper-based alloys coated with Si02-like films by means of plasma-enhanced chemical vapor deposition（PECVD） fed with a tetraethoxysilane/oxygen *** chemical and morphological properties of the films have been characterized by using infrared absorption spectroscopy（IR） and scanning electron microscopy（SEM）with energy disperse spectroscopy（EDS）.The corrosion products of the samples after the tarnishing test have been identified by X-ray diffraction analysis（XRD）.It has been found that SiO2-like films formed via PECVD with a high O2 flow rate could protect copper-based alloys from H2S vapor *** alloys coated at the O2 flow rate of 20 sccm remain uncorroded after 54days of H2S vapor tarnish *** corrosion products for the alloys deposited at a low O2flow rate after 54 days of tarnish testing are mainly composed of brochantite.

关键词： tarnishing test PECVD film copper-based alloys

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维普期刊数据库

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Wetting Behavior of Graphite and CFC Composites by Cu-Ti Compacts

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Journal of Wuhan University of Technology(Materials Science) 2018年第1期33卷 35-42页

作者：王珂毛样武 DENG Quanrong NIE Dunwei mombello domenico Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology Department of Applied Science and Technology Politecnico di Torino

The wetting behavior of Cu-Ti powder compacts with 22 wt %Ti and 50 wt %Ti on carbon materials, including graphite and carbon fiber reinforced carbon composites（CFC）, has been investigated in a vacuum using the sessile drop method. The equilibrium contact angles of Cu-22Ti（containing 22 wt%Ti） on the graphite and the CFC substrates at 1 253 K are 32 o and 26 o, respectively, whereas the equilibrium contact angle of 9° is obtained for Cu-50Ti（containing 50 wt%Ti） on both the graphite and the CFC substrates at 1 303 *** analysis of the wetting samples shows that a thin TiC reaction layer is developed at the interfacial area and Ti-Cu intermetallic compounds are formed over the reaction layer. The investigation on the spreading kinetics of Cu-Ti compacts on carbon materials substrates at fixed temperatures reveals that the spreading is controlled by the interfacial reactions in the first stage and then by the diffusion of the active Ti from the drop bulk to the triple line in the later stage. The spreading is promoted by the intense reaction at higher Ti concentrations.

关键词： joining, wetting, interfaces, wetting carbon materials

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