三种导电防腐涂层的耐蚀性能研究

分别制备聚苯胺改性石墨烯、纳米粒子改性石墨烯和石墨/炭黑复合物三种导电防腐涂料,并将其分别涂覆在Q235钢表面制备导电防腐涂层接地材料。采用接触角仪、电化学阻抗谱、Tafel极化曲线和光学显微镜,研究了该上述涂层在酸性土壤模拟液中的腐蚀性能。结果表明:三种导电防腐涂层均具有优良的防腐性能和较大的接触角。纳米粒子改性石墨烯涂层和聚苯胺改性石墨烯涂层防腐效果大于石墨/炭黑复合导电涂层。纳米粒子改性石墨烯涂层和聚苯胺改性石墨烯涂层的保护效率分别高达92.09%和91.44%。     

高导电特种粉体材料及导电涂料研究

采用快速凝固雾化技术制备Cu-Ag(质量分数为10%～30%)系列超细铜银合金粉末,再结合化学镀的方法制备了Ag/Cu-Ag包覆粉末.通过扫描电子显微镜(SEM)、X射线衍射(XRD)以及电阻测量等方法对粉末及涂料性能进行表征,检测了涂料的表面电阻、电阻率等.结果表明:银包覆超细铜银合金粉末为球形和近球形、表面致密、镀银层均匀,制作的导电涂料表现出优异的导电性能;并且随着银质量分数的增加,涂料的表面电阻和电阻率减小,趋近于纯银涂料.银包覆超细铜银合金粉末既克服了铜粉易氧化的缺陷,又解决了银粉价格高等问题.还对导电涂料的导电机理、影响因素及应用领域进行了分析和说明.     

聚苯胺/石墨烯原位复合水性防腐涂料耐蚀性能的研究

目的研究聚苯胺/石墨烯水性防腐涂料的耐蚀性能。方法采用盐酸为掺杂酸,以聚乙烯基呲咯烷酮(PVP-K30)为空间稳定剂,利用原位聚合法,以苯胺和石墨烯为原料,过硫酸铵为氧化剂,制备聚苯胺/石墨烯复合材料。将聚苯胺/石墨烯、纯聚苯胺、石墨烯分别添加到HG-54C乳液中制备水性防腐涂料,利用动电位极化曲线和盐雾试验对比分析聚苯胺/石墨烯、纯聚苯胺、石墨烯水性涂层的防腐性能,再通过傅里叶红外光谱(FTIR)、扫描电镜(SEM)对比分析其结构和微观形貌。结果聚苯胺均匀地覆盖在石墨烯的片层结构上形成氧化插层结构。当复合材料浸泡在3.5%Na Cl溶液中,腐蚀电流密度为2.3955×10-7A/cm2。盐雾试验表明,聚苯胺/石墨烯的防腐性能优于添加纯聚苯胺和石墨烯的性能。结论聚苯胺/石墨烯涂层具有良好的耐蚀性能,其耐蚀性能优于纯聚苯胺涂层和石墨烯涂层。     

SSA 掺杂的苯胺 / 吡咯导电共聚物的制备及结构表征和防腐蚀性能

在磺基水杨酸(SSA)的酸体系中,以过硫酸铵为氧化剂,采用化学氧化聚合法,调整聚合单体配比,制备了SSA掺杂的苯胺/吡咯导电共聚物(PANI/PY-SSA),通过FT-IR,SEM和XRD等测试手段对其分子结构、微观结构和有序化程度进行了表征。同时,将该导电共聚物加入到环氧树脂涂料中,通过Tafel极化曲线和EIS阻抗谱研究了PANI/PY-SSA对低碳钢材料的防腐蚀性能。结果表明,PY共聚改性明显提高了聚苯胺对金属的保护能力,且当聚合单体配比n(AN)∶n(PY)=3∶7时,制备的PANI/PY-SSA防腐蚀性能最好,涂层的Ecorr为-0.335 V,Jcorr为7.972×10-8 A/cm,RC为2.103×105Ω·cm2,CC为1.646×10-8 F/cm2。     

高氯酸掺杂聚苯胺复合阴极的制备及性能研究

目的 为提高聚苯胺海水电池正极的导电性和放电性能,研究各种制备工艺条件对电极性能的影响。方法 采用电化学的方法,以石墨纸为载体,在高氯酸体系中制备聚苯胺（PANI）/二氧化锰（MnO₂）/氧化石墨烯（GO）复合电极,研究复合电极制备的最优条件。采用X射线衍射仪、红外光谱仪和扫描电镜表征复合电极,采用交流阻抗法、循环伏安法和极化曲线研究电极的电化学性能。结果 石墨纸在室温下经30 mA/cm²的电流密度氧化60min后,在磺基水杨酸（SSA）质量浓度为15g/L,硫酸锰浓度为0.2mol/L的苯胺-高氯酸溶液里以电流密度18mA/cm²聚合20min,可制备出较优的PMGO复合电极,它与镁合金组成海水电池,以200 mA/g恒流放电至1 V,其比能量可达600 W·h/kg。PMGO复合电极的表面微观形貌是由纳米线组成的三维立体网状结构,聚苯胺与二氧化锰成功复合到氧化石墨烯表面。结论 高氯酸体系掺杂的聚苯胺导电性增强,氧化使石墨纸表面形成大量的氧化石墨烯,为苯胺聚合、复合提供大量活性点,复合后电极比表面积增大,与电解液充分...     

表面接枝含氟树脂改性HGB的制备及性能研究

目的对中空玻璃微珠(HGB)进行表面接枝含氟树脂改性,以其为填料制备含氟树脂涂料,并进行性能研究。方法将中空玻璃微珠分别经NaOH溶液、硅烷偶联剂KH550、HDI三聚体、含氟树脂处理,并通过FTIR、SEM、EDS等表征手段对接枝情况进行验证。以制备的表面接枝含氟树脂HGB(F-HGB)为填料,制备了含氟树脂隔热涂料,研究了HGB改性温度、时间对F-HGB接触角的影响,以及HGB粒径、添加量、改性、涂层厚度对涂料的疏水性能、隔热性能、拉伸强度的影响。结果成功制备出F-HGB,50℃下接枝含氟树脂反应8h,F-HGB与纯水的静态接触角为149.21°。与HGB/含氟树脂涂料相比,F-HGB/含氟树脂涂料的疏水性能、隔热性能、拉伸强度均有较大幅度的提高和改善。当F-IM16K添加量为20 phr时,F-HGB/含氟树脂涂层与水的接触角为100°,模拟曝晒实验涂层试板温差为7.4℃,拉伸强度为10.39 MPa。当F-K1添加量为20 phr时,F-HGB/含氟树脂涂层的导热系数为0.0701 W/(m·K),同时涂层隔热性能随HGB粒径、添加量的增大而增强,拉伸强度随之降低,但表面改性能有效减小涂料拉伸强度的降低幅度。结论 F-HGB具有疏水、隔热、与含氟树脂相容性好的特点,可作为功能填料制备疏水、隔热、力学性能优良的多功能涂料。     

聚苯胺/改性石墨复合材料的电化学制备及其防腐蚀性能研究

采用恒电流法、恒电流阶跃电流法、循环伏安法及自聚合法等4种方法将聚苯胺(PANI)原位沉积在自制的改性石墨(MGE)上,制备出聚苯胺/改性石墨复合材料(PANI/MGE)。利用扫描电镜和红外光谱对PANI/MGE的微观形貌和分子结构进行了表征,利用电化学阻抗谱研究了不同聚合方法所得复合材料的防腐蚀性能。结果表明,4种聚合方法所得复合材料微观形貌与聚合前的改性石墨相似,都呈现平面的片层结构,没有聚合物团簇聚集现象产生。4种聚合方法均能成功实现聚苯胺的原位沉积,聚苯胺与改性石墨之间存在较强的相互作用,且以恒电流阶跃所得复合材料中两者的相互作用最强。5种不同涂层中,恒电流阶跃聚合所得涂层的防腐蚀性能最好,稳定的自腐蚀电位及涂层阻抗最高;循环伏安聚合及恒电流聚合所得两种复合涂层的阻抗及自腐蚀电位均随时间的延长而逐渐下降,涂层很快失效。     

电聚合表面改性对电容器用高纯铝箔侵蚀行为的影响

在铝箔表面电聚合制备导电聚合物薄膜,进行表面改性,并在硫酸-盐酸-硝酸钠电解质体系中采用直流方式进行电蚀,研究电聚合表面改性对铝箔电蚀的行为的缓蚀效果及缓蚀机制。研究结果表明:聚合物薄膜通过傅里叶红外检测为酸掺杂态。导电聚合物薄膜覆盖在铝箔表面使其维持高电位,腐蚀介质透过聚合物膜层,使铝发生溶解,在膜层处生成气相,导电聚合物膜层起到阴极作用,促进了铝箔腐蚀形成孔径大小相似的隧道孔,提高了发孔密度和隧道孔长度,气相破坏膜层且阴极薄膜发生氧化还原反应,对铝箔表面过蚀行为起到缓蚀作用。对比聚苯胺薄膜和聚吡咯薄膜对铝箔直流电蚀行为影响,通过扫面电镜图(SEM)和金相断面(OM)分析,表明聚苯胺薄膜的缓蚀效果更为明显,有效提高了表面发孔密度,改善了铝箔表面的过蚀现象,改善了隧道的孔形貌。     

纳米SnO_2/聚苯胺/环氧复合涂层的防腐蚀性能

采用原位氧化聚合法合成了不同质量比的纳米SnO2/聚苯胺复合材料,运用扫描电镜(SEM)、原子力显微镜(AFM)和X射线衍射(XRD)对材料进行表征,并在304不锈钢表面制备了纳米SnO2/聚苯胺的环氧涂层,利用电化学工作站和浸泡增重试验研究其耐蚀性能。结果表明,纳米SnO2/聚苯胺复合材料的防腐蚀效果优于聚苯胺,且当SnO2在复合材料中的质量分数为4%时,防腐蚀性能最佳。依据不锈钢表面复合涂层的结构,建立合理的等效电路,结合电化学阻抗谱数据,研究了纳米SnO2/聚苯胺/环氧复合涂层耐蚀性增强的机制。     

不锈钢表面聚苯胺纳米纤维/改性氧化石墨烯/水性环氧复合涂层的制备与防护性能研究

在氧化石墨烯纳米片(GO)改性的基础上,于非盐酸介质中采用原位共聚法合成了聚苯胺纳米纤维/改性氧化石墨烯复合材料(PANI-F/CTGO),将其作为防腐增效组分引入到水性环氧聚合物乳液(WEP)中构建复合涂料.采用电化学方法和盐雾实验研究了涂料在加速腐蚀条件下对不锈钢的腐蚀防护作用,对腐蚀产物结构进行了分析.复合材料中...     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.