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集装箱用SPA-H耐大气腐蚀钢的开发研制 总被引：1，自引：0，他引：1
为适应集装箱用耐大气腐蚀钢的需求,近年来,本溪钢铁(集团)有限责任公司采用铁水预处理、转炉冶炼、AHF精炼、连铸、热连轧及控轧控冷等工艺成功地开发了SPA-H耐大气腐蚀钢.通过化学成分和生产工艺优化,使钢材的各项性能达到标准要求. 相似文献
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《文物保护研究》2013,58(1):50-57
AbstractThe conservation of roofing and cladding materials has both environmental and cultural heritage bearing. Our research aimed at comparing the performances of some polymeric products used for the protection of a typical Italian sandstone, the ‘Agro d'Ardesia’, used mostly as cladding, paving, roofing, and building material. These products belong to three different classes: polysiloxanes, acrylics, and fluoropolymers. In addition, an acrylic–silicone mixture was chosen for testing. After the application onto the Agro sandstone by capillary absorption, both efficacy and durability were assessed. Particularly, two types of weathering tests were performed to check the stability over time of the protective products: the exposure to ultraviolet radiation in a climatic chamber and the ageing by exposure to acid rain, expressly designed to represent realistically natural and anthropogenic changes. Detailed information on treatment performances was obtained. The polysiloxane was shown to be the most effective protective material for the Agro sandstone. 相似文献
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《Journal of Cultural Heritage》2014,15(4):345-351
Monumental stone decay is a consequence of the weathering action of physical, chemical and biological factors, which induce a progressive increase in porosity. To cope this degradation, bacterial calcium carbonate mineralization has been proposed as a tool for the conservation of monumental calcareous stones. The advantage of this kind of treatment is to obtain a mineral product similar to the stone substrate, mimicking the natural process responsible for stone formation. In this work, the possibility to induce CaCO3 mineralization by a bacteria-mediated system in absence of viable cells was investigated and tested on stone. Our results showed that Bacillus subtilis dead cells as wells as its bacterial cell wall fraction (BCF) can act as calcite crystallization nuclei in solution. BCF consolidating capability was further tested in laboratory on slab stones, and in situ on the Angera Church, a valuable 6th century monumental site. New crystals formation was observed inside pores and significant decrease in water absorption (up to 16.7%) in BCF treated samples. A little cohesion increase was observed in the treated area of the Angera Church, showing the potential of this application, even though further improvements are needed. 相似文献
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The stained glass windows of the Pavia Carthusian Monastery are an important testimony of medieval glass making in which a wood-ash flushing component was used. Glass surfaces reveal alteration processes extending to depth, with evidence of microbial corrosion. Electron microprobe analyses coupled with EDS data allow the identification of different steps in the alteration process. Microbial attack occurs in an early stage and determines component leaching of the glass, with the development of reactions in which the crystallisation of gypsum is favoured. 相似文献
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Bailong (White Dragon) Cave locates in theBailong hill occupied by Middle Triassic calcareousdolomite in Mile County, 200 km south to Kunming,Yunnan Province, China. The cave entrance is lo-cated in N 24°11′55.2″, E 103°20′59.7″, 1500 mabove sea level. The tourist trail in the two-level caveis 1118.8 m long: the upper level is 477 m long andthe lower level 641.8 m long. The cave is in sub-tropical semi-humid and plateau climate zone withannual average temperature of 17.3 °C and av… 相似文献
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Stavroula Golfomitsou 《文物保护研究》2016,61(3):55-60
In recent years Qatar has invested a significant sum of money on exhibitions of contemporary artists and public art. This paper discusses decision-making processes in the conservation of contemporary artworks installed in newly emerging art markets such as Qatar, where there are no established practices. In 2014, Richard Serra's East–West/West–East, an installation of four vertical plates made of weathering (Corten?) steel, which span one kilometre at heights so as to reach the level of the surrounding gypsum plateaus, was installed in the Brouq Nature Reserve near Zekreet desert, two kilometres from the sea in the western part of Qatar. The artwork is already considered by some a landmark for the isolated area. The plates have started to develop protective corrosion layers, although Corten? is not completely corrosion resistant when located near coastal sites. They have also started to bend and are heavily inscribed by visitors. Conservation of public art is complex, as site-specific artworks are linked with the landscape and defined by the relationships they develop with the public. Art installations of this magnitude demand not only conservation measures but also a management plan. The isolated location, the scale of the artwork, the aggressive environment, and the lack of supervision and monitoring of the area challenge current practices but offer an opportunity to develop methods to preserve art of site-specific art in new environments and diverse audiences. Monitoring will allow a better understanding of the interactions of visitors with the artwork and will shed light on the material's behaviour in this specific environment. 相似文献
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