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Influence of deposition voltage on phase, microstructure and antioxidation property of cristobalite aluminum phosphate coatings
作者: 杨文冬, 黄剑锋, 曹丽云, 曾燮榕 主题: carbon/carbon composites, aluminum phosphate, hydrothermal electrophoretic deposition, deposition voltage, micro-structure, antioxidation 年份: 2010
摘要: cristobalite aluminum phosphate (c-alpo_4) coatings were prepared by a hydrothermal electrophoretic deposition process on sic-coated c/c composites. phase compositions and microstructures of the as-prepared coatings were characterized by xrd and sem analyses. the influence of deposition voltage on the phase, microstructure and antioxidation property of the cristobalite aluminum phosphate coatings was investigated. results show that the as-prepared coatings are composed of cristobalite aluminum phosphate crystallites. the thickness and density of cristobalite aluminum phosphate coatings are improved with the increase of deposition voltage. the deposition amount and bonding strength of the cristobalite aluminum phosphate coatings also increase with the increase of deposition voltage. the deposition mass per unit area of the coatings and the square root of the deposition time at different hydrothermal voltages satisfy linear relationship. the antioxidation property of the coated c/c composites is improved with t...
Coupling effects of influence factors on probability of corrosion initiation time of reinforced concrete
作者: 张小刚, 赵衍刚, 邢锋, 卢朝辉 主题: reinforced concrete, corrosion initiation time, coupling influence model, influence factors, natural exposure data, probability distribution 年份: 2011
摘要: the coupling model of major influence factors such as environmental relative humidity,load-induced crack and stress state affecting the chloride diffusion process in concrete is discussed.the probability distributions of the critical chloride concentration cc,the chloride diffusion coefficient d,and the surface chloride concentration cs were determined based on the collected natural exposure data.and the estimation of probability of corrosion initiation considering the coupling effects of influence factors is presented.it is found that the relative humidity and curing time are the most effective factors affecting the probability of corrosion initiation before and after 10 years of exposure time.at the same exposure time,the influence of load-induced crack and stress state on the probability of corrosion initiation is obvious,in which the effect of crack is the most one.
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