纳米氧化硅复合环氧和聚氨酯涂料耐磨性与耐蚀性研究

    利用两步法制备了纳米氧化硅复合环氧涂料和聚氨酯涂料.并对其耐磨性与耐蚀性进行了研究.其结果表明：与未加入纳米氧化硅的涂层相比,纳米氧化硅复合环氧涂层和聚氨酯涂层的显微硬度分别提高7%、6.2%,耐磨性有很大提高,同时纳米氧化硅聚氨酯涂层耐蚀性有明显提高,纳米氧化硅环氧涂层的耐蚀性没有下降.        

碳纳米管改性无机-有机水性富锌涂料的制备及其性能

在常见的水性无机硅酸盐富锌涂料中添加适量的硅丙乳液及碳纳米管,制成了无机-有机复合水性富锌涂料。对几种不同配比涂层的主要力学性能、电化学性能、耐盐雾性能及耐空蚀性能进行了测试分析,结果表明当硅丙乳液和碳纳米管分别占基料的20%和1%,颜基比为2:1时,涂料的基料稳定,喷涂粘度适中;同时涂层在保持了无机富锌涂料优异耐腐蚀性能的基础上,其耐空蚀性能也得到了很大提高。     

4种涂料的耐老化性能对混凝土表面裂缝追随性的影响

    选用4种最常用的混凝土涂料配套方案，通过比较涂料的耐老化性能和耐老化性实验前后的裂缝追随性能，研究了涂料耐老化性能和裂缝追随性的关系.结果表明，涂料的耐老化性能是裂缝追随性的重要影响因素，氟树脂面涂的耐老化性能最高且其涂装体系追随性在老化试验后得到良好的保持.     

磷酸锌对涂层耐腐蚀性能的影响

涂料一般是由树脂,填料、溶剂和助剂构成的,其中对涂层性能影响最大的是树脂和填料.在树脂种类确定的情况下,填料是影响涂料性能的主要因素.合理地选择颜填料的种类及其含量是决定防腐蚀涂料耐腐蚀性能的关键.本文注重研究了不同含量的磷酸锌对涂层耐腐蚀性的影响,并对磷酸锌耐腐蚀机理进行了探讨.     

钛添加剂对无铬达克罗防护性能的影响

    通过极化曲线、EIS等电化学手段研究了钛添加剂对无铬达克罗涂层防护性能的影响.结果表明：1%添加剂量对提高涂层防护能力有明显作用,延长了耐盐雾腐蚀时间;这是由于钛添加剂的加入使涂层具有更长的牺牲阳极保护时间以及较低的腐蚀电流,而大于或小于此值都不能提高防护性能.     

磷酸对氯乙烯-丙烯酸共聚物带锈涂层防腐性能的影响

制备了一种以氯乙烯-丙烯酸共聚物为成膜物质,磷酸作为转化剂的转化型带锈涂料,通过对添加不同质量分数磷酸的涂料样板进行盐雾实验、电化学测试及分析,研究了磷酸含量对带锈涂料性能的影响。通过涂层表面的微观分析,研究了磷酸与铁锈之间的反应情况。结果表明:磷酸主要与铁锈中较活泼的纤铁矿反应,将其转化为致密的磷酸铁膜对基底进行保护。添加10%磷酸的涂层在盐雾实验和电化学实验中较其他涂层表现出了最佳的综合耐蚀性能。     

聚氨酯涂层球墨铸铁管的研制

研制了一种专用于球墨铸铁管的聚氨酯涂层,研究了涂料配比对粘度、流平性、固化速度、附着力、硬度等涂料性能的影响,分析了工艺参数如温度、压力对涂层质量的影响.     

无溶剂环氧涂料的抗阴极剥离性能

研究了环氧涂层抗阴极剥离性能的主要影响因素,结果表明,涂料自身性能、表面处理状况以及阴极保护电位均对涂层的抗阴极剥离性能产生影响。     

缓蚀剂对硅烷锌铝涂层性能的影响

    在涂层中添加缓蚀剂以改进硅烷锌铝涂层的防腐性能，研究了三种环保型缓蚀剂的影响，结果表明，缓蚀剂的加入改善了涂层的防腐性能，极化曲线结果显示，缓蚀剂主要是降低了涂层中锌铝粉的腐蚀电流，从而延缓了金属粉的消耗.通过对三种不同的缓蚀剂的对比研究发现，磷钼酸盐的缓蚀率高于氯化铈及钼酸盐.     

石油储罐几种外防护涂层性能的评价

涂层保护是石油储罐腐蚀防护的主要措施。为此,国内曾先后开发了醇酸银粉漆、氯磺化聚乙烯涂料、高氯化聚乙烯涂料、丙烯酸聚氨酯防腐蚀涂料、常温固化型氟碳涂料等,并在不同时期的工程建设中得到应用。不同的涂料具有不同的表面性能,设计部门和使用单位往往根据涂料性能和实际需求选择涂料。醇酸银粉漆和氯磺化聚乙烯涂料因其使用寿命短而被淘汰。对高氯化聚乙烯涂层、丙烯酸聚氨酯涂层、常温固化型氟碳涂层进行了光老化、盐雾、酸碱浸泡、表面能、耐沾污性等多种表面性能的测试评价。结果表明:常温固化型氟碳涂层综合性能优于高氯化聚乙烯涂层和丙烯酸聚氨酯涂层。     

Electroless Ni-P coating of different magnesium alloys

Coating of AZ31B, AE 42 and ZRE1 wrought magnesium alloys was carried out using electroless Ni plating technique in a solution of nickel sulphate, sodium hypophosphite, ammonium hydrogen fluoride and glycine with a zinc immersion pre-treatment.The results of SEM/EDX investigations and X-ray diffraction indicate that the coat exhibit a typical surface morphology with compact nodules with good adherence to the substrate. The coat was composed of amorphous structure, which transformed to a mixture of crystalline Ni and Ni₃P precipitates after heat treatment at 673°K for 1 h. The phosphorous (P) content increased gradually from the substrate towards the surface reaching a maximum of 10 wt.% to 18 wt.% on the surface depending on the substrate alloy and the thickness of deposit. The hardness of the coat was found to increase with the P content and also after heat treatment. The electrochemical corrosion test in NaCl solution indicated a great improvement in the corrosion resistance of the Mg substrates and that a noble behaviour of Ni-P was obtained regardless of the heat treatment process. The forming ability test indicates that hot rolling of the coated substrate does not succeed to keep a continuous coat due to cracking of the coat in both as-coated and heat treated specimens.     

Influence of bond coat on shear adhesion strength of erosion and thermal resistant coating for carbon fiber reinforced thermosetting polyimide

Arc-sprayed Al, Zn, and plasma-sprayed Al, Zn, Ni3Al and Cu were deposited on carbon fiber reinforced polyimide substrate as bond coats for erosion and thermal resistant coating. Shear adhesion strength of different materials was tested, and microstructures of bond coats were analyzed with scanning electron microscope. The results showed that the substrate was thermally damaged when Ni3Al or Cu was deposited as bond coat, and the bond coat was delaminated from the substrate. Arc-sprayed and plasma-sprayed Al and Zn could be used as bond coat materials. For Zn as bond coat material, depositing method had little influence on shear adhesion strength. While for Al as bond coat material, plasma spray was superior to arc spray. Preheating could improve shear adhesion strength with plasma sprayed Al as bond coat. The maximum shear adhesion strength obtained in this paper was 14.15 MPa, with plasma-sprayed Al as bond coat, and the preheating temperature was 250 °C.     

Fe-based soft magnetic amorphous alloys with high saturation magnetization above 1.5 T and high corrosion resistance

Fe-rich amorphous alloys with minor-addition of Cr and/or Nb were examined with the aim of developing Fe-based amorphous alloys exhibiting simultaneously high saturation magnetization above 1.5 T and good corrosion properties. Fe₈₂Cr₂B₈P₄Si₃C and Fe₈₂NbB₉P₄Si₃C amorphous alloys were found to exhibit high saturation magnetizations of 1.49 T and 1.57 T, respectively, and rather good corrosion resistance in 3.5 mass% NaCl solution at 298 K. The minor-addition of Cr or Nb enables the formation of amorphous alloy particles without harmful oxide layer by water atomization process which makes these alloys suitable for applications as soft magnetic core materials. The addition of 1 at% Nb improved the corrosion resistance through the increase in E_corr value, which makes easy to reach passive state, and the suppression of pitting corrosion. Besides, it has been proved that the simultaneous addition of Nb and Cr has an effect on forming protective passive film.     

Effect of surface condition during pre-oxidation treatment on isothermal oxidation behavior of MCrAlY bond coat prepared by EB-PVD

NiCoCrAlY bond coat was deposited on Ni-based superalloy by means of EB-PVD method. Surface treatment by means of polishing and shot-peening methods were used in order to study the effect of surface conditions on the bond coat performance at 1100 °C. Oxidation resistance was found to be strongly affected by surface modification during pre-oxidation treatment.     

醇基涂料抗点燃起泡性的研究

醇基涂料的抗点燃起泡性与酚醛树脂、ＰＶＢ等高聚物形成的致密的表面膜层和酒精载液的燃烧速度有关，从提高载液浓度、破坏表面膜连续性、调节涂层燃烧速度等方面选择合适的附加物，可显著改善点燃起泡现象。     

Fracture resistance evaluation of RuO2-based thick film resistor material by in situ crack extension observation in a scanning electron microscope

Parameters for the fracture mechanics of thick film materials are scarce in the literature. One reason is that for many such materials it is very difficult to produce a bulk specimen as required for most standard tests. This paper describes an alternative method for measuring the fracture resistance of a ruthenium dioxide (RuO₂)-based thick film resistor material for electronic applications. The method is based on an in situ investigation of crack propagation in the loaded material. The investigated material is printed as a thick film on a substrate of low-temperature-co-fired-ceramic. An initial crack in the film is introduced with a Vickers indenter. The crack is subsequently loaded with a four-point bending equipment in a scanning electron microscope, which allows for in situ crack length measurement. The crack growth measurements reveal that once a certain crack length is achieved the load required to extend the crack becomes independent of the crack length. Beyond this length, the crack propagates in the so-called steady-state region, which is used in the present method to estimate the fracture resistance of the film. Both tensile stresses resulting from bending and tensile residual stresses are taken into account. Although a brittle substrate was used, the crack did not penetrate into the substrate. The measured fracture resistance of 0.69 ± 0.14 MPa√m is found to be realistic for the investigated thick film material with high silicate glass content.     

硅烷膜对有机硅涂料性能的影响

    采用红外反射吸收光谱、热失重分析、电化学交流阻抗谱等方法研究了巯丙基三乙氧基硅烷膜对有机硅涂层的附着力、耐热性以及耐蚀性的影响.结果表明,MPTES硅烷膜与金属基体发生了化学反应,界面互穿网络的形成增强了涂层与基体的结合力,提高了涂层的热分解温度,改善了涂层耐蚀性.     

成膜时间对镁合金镧盐转化膜耐蚀性的影响

稀土盐转化膜是一种绿色环保的金属表面处理技术,为探究硝酸镧成膜时间对镁合金耐蚀性的影响,在镁合金表面成功制备出不同成膜时间下的镧盐转化膜。 试验采用扫描电镜(SEM)、能谱仪(EDS)以及 X 射线衍射仪(XRD) 对膜层的表面形貌及组成进行了表征,采用点滴试验、电化学方法(EIS / Tafel)对不同成膜时间下膜层的耐蚀性进行了测试,并使用软件对结果进行拟合。 试验结果表明,镁合金表面生成了一层微米级的稀土转化膜,转化膜表面存在裂纹,其中 30 min 成膜时间的裂纹最小;点滴试验及电化学测试结果表明镧盐转化膜能够大幅度地提高镁合金耐蚀性, 30 min 成膜时间获得的膜层耐蚀性最佳,相对于空白镁合金,其自腐蚀电流密度下降了 4 个数量级,自腐蚀电位正移了 943 mV;EDS 结果表明,膜层主要由 La 和 O 元素组成,XRD 结果进一步表明 La(OH)₃ 是膜层的主要成分。     

铝合金表面四价铈盐转化膜及其耐蚀性

发展了一种新型的铝合金表面四价铈盐稀土转化膜成膜工艺-SRE工艺。考察了工艺因素对成膜耐蚀性的影响及成膜的动力学规律。经SRE工艺处理的铝合金在氯化钠溶液中的耐蚀性得到明显改善。利用AES、EPMA、ESCA考察了SRE转化膜的组成、价态及元素在膜中沿深度的分布规律。     

Effect of coating bath composition on the properties of electroless nickel-boron films

The effect of borohydride, thallium acetate, ethylenediamine and sodium hydroxide concentrations, and the coating bath temperature on both the coating rate and boron content of the electroless Ni-B films was investigated systematically. The Ni-B coating rate increased with the increase in thallium acetate and sodium hydroxide concentrations, but it was not very sensitive to the borohydride concentration. Below 90 g L^− 1 ethylenediamine concentration the coating efficiency was significantly low and above this value as the ethylenediamine concentration increased the coating rate decreased slightly. Below 85 °C the coating rate was very low and above this temperature it was insensitive to the bath temperature. The boron content of Ni-B film increased with the increase in the borohydride concentration and the bath temperature, and decreased with the increase in thallium acetate and ethylenediamine concentrations. Up to 50 g L^− 1 sodium hydroxide concentration, the boron content of the film increased and above this concentration it was insensitive to the sodium hydroxide concentration. As the boron content of Ni-B film increased, both the corrosion resistance and microhardness of Ni-B film increased. Heat treatment brought significant improvement in the microhardness but the corrosion resistance of Ni-B film was observed to decrease due to the disappearance of the amorphous characteristics of the as-deposited Ni-B film and the formation of the Ni-B compound phases.