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研究了6063铝合金阳极氧化工艺的电流密度、槽液温度、氧化时间、氧化膜表面粗糙度以及表面形貌对太阳吸收率(αs)和半球发生率(εH)的影响,确定制备低比值αs/εH热控涂层的阳极氧化工艺。研究表明6063铝合金制备低比值的αs/εH热控涂层的阳极氧化工艺:电流密度1.0 A/dm2,电解液温度18℃,氧化时间30 min,氧化膜表面的粗糙度为0.58,此种工艺制备出的氧化膜的αs/εH比值最小为0.164,同时研究发现氧化膜封孔的质量对αs/εH具有重要影响。 相似文献
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Xiao Wang Qiaoxia Li Penghui Shi Jinchen Fan Yulin Min Qunjie Xu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(48)
Hydrogen is regarded as the most promising green clean energy in the 21st century. Developing the highly efficient and low‐cost electrocatalysts for oxygen evolution reaction (OER) is of great concern for the hydrogen industry. In the water electrolyzed reaction, the overpotential and the kinetics are the main hurdles for OER. Therefore, an efficient and durable oxygen evolution reaction electrocatalyst is required. In this study, an activated graphene (AG)–black phosphorus (BP) nanosheets hybrid is fabricated for supporting Ni3N particles (Ni3N/BP‐AG) in the application of OER. The Ni3N particles are combined with the BP‐AG heterostructure via facile mechanical ball milling under argon protection. The synthesized Ni3N/BP‐AG shows excellent catalytic performance toward the OER, demanding the overpotential of 233 mV for a current density of 10 mA cm?2 with a Tafel slope of 42 mV dec?1. The Ni3N/BP‐AG catalysts also show remarkable stability with a retention rate of the current density of about 86.4% after measuring for 10 000 s in potentiostatic mode. 相似文献
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目前镁合金表面稀土-硅烷化改性多采用复合工艺,简单硅烷化处理研究较为少见。将不同含量的硝酸铈直接添加到KH-550硅烷溶液中,应用简单化学浸渍法在AZ91D压铸镁合金表面制备了铈盐改性硅烷复合膜;通过点滴腐蚀试验、全浸腐蚀试验和电化学交流阻抗谱评价了铈盐改性复合膜的耐蚀性能,利用扫描电子显微镜和椭偏仪分析了铈盐改性复合膜的表面微观形貌和厚度。结果表明:与硅烷膜相比,铈盐改性硅烷复合膜较均匀、致密、平整,厚度明显增加;随着硝酸铈含量的增加,铈盐改性硅烷复合膜的耐蚀性能先上升后下降,当硝酸铈掺杂量达到0.50 g/L时,复合膜的耐蚀性能最佳;随盐水浸泡时间的延长,复合膜的低频阻抗值先增大后减小,表明其具有一定的"自修复"能力。 相似文献