Protection Performance of Plasma Sprayed Al_(2)O_(3)-13 wt%TiO_(2) Coating Sealed with an Organic-inorganic Hybrid Agent

An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coatings was comprehensively evaluated based on both anti-corrosion and anti-biofouling properties.The results reveal that the sealing treatment is remarkably useful to decrease the porosity of the coating,and the porosity of the coating sealed with the hybrid agent is only 0.035%.Immersion corrosion test and Tafel polarization test reveal that the sealed coating with the hybrid agent exhibits a better corrosion resistance by compared with the coating sealed with silicone agent.The corrosion current density i_(corr) of the hybrid agent sealed coating is only 0.7×10^(-6)A·cm^(-2).Moreover,anti-biofouling tests both in the outdoor analogue hydraulic environment and in the natural marine environment prove that the mentioned novel coating presents a better combination of corrosion resistance and anti-biofouling property by compared with the other coatings,and it could be used as a protection of metal components in the marine environment.

老苹果园更新改造的关键技术

平陆县20世纪90年代已大面积种植苹果,如今这些果园普遍出现郁闭、树体衰弱、病虫害严重、土壤板结、果品品质下降等问题,加上果树树体偏高、果农年龄偏大,操作不便。提出老苹果园改造的关键技术措施,包括选择优良品种、树体改造、高接换优、土壤改良、配方施肥等。

股市泡沫形成机制及后续经济恢复研究——基于台湾地区股市的实证分析

本文回顾了90年代台湾股市危机,并研究股市泡沫的形成机制。经过格兰杰因果关系检验验证,得出如下结论:金融自由化浪潮下,台湾当局放宽外汇管制,热钱流入;为平缓台币升值速度,当局干预外汇市场,致信贷宽松;货币由信贷渠道流向资本市场,形成股市泡沫;股市泡沫破灭之后,台湾地区通过改善金融结构、实现经济脱虚向实,成功抵御住了亚洲金融危机的冲击。最后,本文借鉴台湾地区的经验教训,对大陆当前的房地产泡沫,提出了稳步推行房地产税、推动经济脱虚向实等政策建议。

等离子喷涂FeCrMoCBY铁基非晶涂层耐蚀性研究

采用等离子喷涂技术制备了FeCrMoCBY铁基非晶涂层,研究了铁基非晶涂层在3.5%NaCl溶液中浸泡不同时长后的电化学腐蚀性能和微观组织结构。结果表明,在720 h的浸泡期间,涂层的耐蚀性经历了先提高后降低的变化,在浸泡216 h时达到最优,腐蚀电流密度达到最低,为3.393×10^(-5)A·cm^(-2),且此时涂层的表面更加致密,没有明显孔隙。在经过720 h浸泡后,涂层仍能保持在一个相对较低的腐蚀电流密度6.970×10^(-5)A·cm^(-2)。