Effects of coating thickness and surface treatment on the corrosion protection of diglycidyl ether bisphenol-A based epoxy coated carbon steel

The corrosion resistance of carbon steel specimens was compared, using different surface treatment methods such as blasting and zinc phosphate treatment on carbon steel followed by application of different coating thickness. Specimen surface morphology was observed by SEM. The corrosion performance of epoxy coated carbon steel was examined by electrochemical impedance spectroscopy (EIS), along with immersion test in 0.5N-NaCl solution and NORSOK M 501 cyclic test, respectively. EIS results showed that higher thickness of epoxy coating and zinc phosphate treatment on carbon steel showed better corrosion protection than rest of the specimens. Specimens with no treatment and blasting treatment followed by epoxy coating, showed poor corrosion protection. Results of NORSOK M 501 cyclic test showed similar trend as those of EIS results however degradation of specimens was more severe than those from immersion test.     

环氧树脂/氧化锌晶须/氮化硼导热绝缘复合材料的研究

以环氧树(脂EP)为基体,分别以氧化锌晶(须ZnOw)和ZnOw/氮化硼(BN)混合物为导热填料,制备了EP导热绝缘复合材料。研究了填料含量对复合材料导热性能、电绝缘性能及力学性能的影响,并利用扫描电镜对复合材料的断面形貌进行了观察。结果表明:随着导热填料含量的增大,复合材料的导热系数和介电常数增大,体积电阻率下降,而拉伸强度呈先增大后减小的趋势;在填料含量相同的情况下,EP/ZnOw/BN复合材料比EP/ZnOw复合材料具有更好的导热性能;当填料体积分数为15%时,EP/ZnOw/BN复合材料的热导率为1.06W/(mK)而,EP/ZnOw复合材料的热导率仅为0.98W/(mK)。     

稀土铈掺杂纳米氧化锌抗菌聚乙烯的性能研究

以PE为基体树脂，选用自制的Ce^4＋／ZnO复合抗菌剂，通过熔融共混挤出工艺制备了PE抗菌功能塑料，并对其抗菌活性以及抗菌机理进行了分析与探讨。研究结果表明，掺杂稀土Ce^4＋明显提高了纳米ZnO的抗菌能力。当抗菌剂粉体的添加量为PE质量的1％时，PE抗菌塑料的性价比达到最佳，具有优异、长效的抗菌性能，其对大肠杆菌和金黄色葡萄球菌的抗菌率均达到97％以上，并且对大肠杆菌的抗菌效果要优于金黄色葡萄球菌。     

Seed/catalyst-free growth of zinc oxide nanostructures on multilayer graphene by thermal evaporation

We report the seed/catalyst-free growth of ZnO on multilayer graphene by thermal evaporation of Zn in the presence of O₂ gas. The effects of substrate temperatures were studied. The changes of morphologies were very significant where the grown ZnO structures show three different structures, i.e., nanoclusters, nanorods, and thin films at 600°C, 800°C, and 1,000°C, respectively. High-density vertically aligned ZnO nanorods comparable to other methods were obtained. A growth mechanism was proposed based on the obtained results. The ZnO/graphene hybrid structure provides several potential applications in electronics and optoelectronics.     

会理锌矿选矿废水循环利用的研究

为解决四川会理锌矿选矿废水循环利用的问题,对自然降淀、混凝沉淀、吸附分离等处理方法分别进行了小试,并将处理后的选矿废水进行闭路试验。结果表明,混凝沉淀—活性炭吸附法处理选矿废水可有效去除COD,回用作选矿水不会影响选矿指标,可实现选矿厂废水的零排放。     

Zn和RE对Mg-9Al合金热裂倾向性的影响

用热裂环法考察合金的热裂倾向性，并对合金的冷却曲线和铸态组织进行了分析。Zn加入Mg—9Al合金降低了合金的凝固结束温度，平均每增加0．1％，合金的凝固结束温度降低0．7℃。Zn促进了Mgl7Al12相在晶界的析出，降低了凝固结束温度，并显著增加了合金的热裂倾向性。RE对Mg—9Al合金的热裂倾向性和凝固结束温度影响很小。但当Zn含量超过0．8％时，RE的加入可以显著降低Mg—9Al-Zn合金的热裂倾向性。     

国外某金矿提高锌粉置换率试验研究(增刊)

国外某金矿从全泥氰化技改为先进行硫浮选,然后硫浮选精矿进行浸出的工艺流程后,贵液锌粉置换率低,金属流失,回收金效果差,贵液品位约1.5～1.8 g/t,相比相比技改前期上升27%左右。通过开展氰化钠浓度、锌粉用量、醋酸铅用量、PH值单因素试验,优化药剂制度,提高氰化钠与醋酸铅用量,金作业置换率稳定在99.0％以上,贫液金品位降低至0.015 ppm以内,尾矿带走水分中金含量下降,彻底解决了因置换率低造成金属流失的问题,保证了锌粉置换作业技术指标。     

Solution-based synthesis of ZnO nanoparticle/CdS nanowire heterostructure

The heterostructure of ZnO nanoparticle (NP)/CdS nanowire (NW) was successfully fabricated by a two-step chemical solution method. The first, CdS nanowires were synthesized by a simple solvothermal route. The second, ZnO nanoparticles were grown on the surface of CdS nanowires in a chemical solution of Zn(CH₃COO)₂·2H₂O and anhydrous ethanol at 200 °C. The heterostructure of synthesized ZnO NP/CdS NW was characterized by transmission electron microscopy (TEM). The effects of reaction conditions, such as different reaction time of CdS nanowires synthesized and deposition reaction time were investigated. Moreover, the formation mechanism of the ZnO NP/CdS NW heterostructure has been phenomenologically discussed.     

FPS节能减摩剂组分的研究

报道了FPS节能减摩剂、二硫代磷酸钼(MoDTP)和二硫代磷酸锌(ZnDTP)的~(31)P—NMR谱,并用~(31)P—NMR法研究了其组分的构成和变化。结果表明,FPS节能减摩剂是由31.0％有机Mo—S化合物、53.8％有机Zn—S化合物、3.5％有机P=S化合物和11.7％有机P=O化合物组成的有机磷混合物。     

SiC纳米粒子增强锌铝基耐蚀涂层的制备及性能研究

为解决锌铝基耐蚀涂层在高速、强摩擦等特殊服役条件下的使用问题，探索性地添加SiC纳米粒子对锌铝基耐蚀涂层进行改性，以提高涂层的硬度和强度。研究了SiC纳米粒子及其添加量对涂层硬度、附着强度、耐冲击性能和耐腐蚀性能的影响，并对涂层的微观组织和成分进行了分析。结果表明，添加SiC纳米粒子可显著提高锌铝基耐蚀涂层的硬度，且没有对涂层的附着强度、耐冲击性能和耐腐蚀性能带来负面影响。SiC纳米粒子在涂层中的均匀分散是保障涂层综合性能优异的必要条件。