海洋环境热喷涂铝复合涂层保护机理分析

通过铝复合涂层的交流阻抗及聚合铝的IR，^27Al NMR，激光Raman分析等试验，从铝的腐蚀产物形态分析，酸度对聚合铝无机高分子稳定性的影响角度，研究了铝复合涂层的保护机理，分析了海洋对环境铝复合涂层保护效果的影响，得出酸度影响是常见保护失效的主要原因。     

海洋工程应用水下涂装防污涂料的研究

将叠氮基团接枝到环氧树脂上以提高环氧树脂的湿态附着强度,然后将其与环氧树脂618按不同比例复配制备成水下涂装防污涂料,并对涂料的附着强度、铜离子渗出率及海洋防污性能进行研究。研究表明,随着叠氮化环氧树脂用量的增加,水下防污涂层的附着强度先升高后降低;铜离子渗透出率测定和实海浸泡表明该水下涂装防污涂料具有一定的防污性能。     

锌铝合金表壳体镀覆金属陶瓷复合膜

随着压铸技术和真空镀技术的发展,成本较低的锌铝合金成为越来越多表壳体基材的首选材料,本公司研制、被国家科技部列为"863高技术发展计划"的金属陶瓷复合膜(CCF),用于锌铝合金表壳体电镀后的复合真空镀表面处理,极大地提高了其装饰性和功能性,具有广阔的市场应用价值和发展前景.     

等离子喷涂六钛酸钾涂层工艺研究

为了探索六钛酸钾热障涂层的制备工艺,通过正交试验分析方法,采用等离子喷涂工艺制备了钛酸钾热障涂层.研究了喷涂工艺对涂层物相结构的影响,采用定量金相分析了涂层组织.结果表明:喷涂工艺对涂层的物相结构有显著影响,随喷涂工艺的改变,涂层由类似于八钛酸钾的某种结构转变为以六钛酸钾结构为主的相结构;涂层孔隙分布均匀,孔隙率在10%左右.     

ZnNi合金用作热喷涂防腐蚀涂层材料

探讨了ＺｎＮｉ合金中镍含量对合金材料脆性的影响,结果表明,随着镍含量的增加,合金脆性增大,镍含量大于７％时,已难以制出电弧喷涂间要讨论了镍对合金喷涂层耐蚀性的作用,添加镍的Ｚｎ合金涂层的耐蚀性均高于Ｚｎ涂层,且耐蚀性随着Ｚｎ涂层,且耐蚀性能ｉ含量的增加而提高。     

Microstructure of Nanostructured WC-Co Coating Prepared by Thermal Spraying

Nanostructured WC-Co coatings were produced with Atmospheric Plasma Spraying (APS) and Low Pressure Plasma Spraying (LPPS). Microstructure characteristics and phase compositions of the coatings were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The microstructure compositions were analyzed with EDS. During APS deposition the existence of oxygen causes the decarburization of the coating, and the coating was composed of melted area and the WC/12Co powder. Besides WC phase, there was W2C phase. However in the coating deposited by LPPS the content of oxygen was so low that there were a limit degradation of the WC/12Co powder. The coatings were made up of compact block and loosen porosity area. There were large quantities of nanostructure WC grains and a small quantity of microstructure WC grains presented in the coating. Besides WC phase, a little W2C and WC1-x or Co6W6C phases occured. Consideration of the characteristics of the highly porous, spherical-shell morphology of nano-WC/12Co power, heterogeneous melting and localized superheating of the power were two main factors which caused the microstructure and phase composition of nano-WC-Co coatings.     

热喷涂Zn-Al合金防腐涂层技术的研究进展

热喷涂Zn-Al合金涂层技术是一项新发展起来的防腐技术.介绍了近年来分别利用火焰喷涂技术和电弧喷涂技术制备Zn-Al合金涂层及其喷涂材料的研究应用现状,分析了涂层的形成及其耐蚀机理,并展望了热喷涂Zn-Al合金涂层技术的发展趋势.     

Characterization of Gradient Ni-Fe/SiC Composite Coating on Mild Steel by Thermal Spraying in Combination with Laser Cladding

0 IntroductionMetal matrix composites(MMCs)can usuallyprovide a high stiffness to weight ratio and high wearresistance,and a material with a surface MMC hasthe potential to develop these properties on its sur-face[1].And laser cladding has been found to be anefficient technique to prepare MMC coatings on thesubstrates such as Al-based alloy,steel,brass andbronze[2~4].Among various MMC coatings preparedby laser cladding,those reinforced with oxides(mainly Al2O3)and carbides(TiC,SiC,B4C,…     

混凝土表面热喷涂陶瓷防护涂层的可行性试验研究

针对水泥混凝土长期耐久性防护的迫切需求,将热喷涂技术创新性引入混凝土表面防护领域.通过涂层与基体附着力及粘结面微观结构的初步测试,试验验证了混凝土表面等离子热喷涂陶瓷涂层的可行性.结果表明,通过原材料优选与热喷涂工艺优化,热喷涂过程的瞬间高温对混凝土基体并无损伤.涂层总厚度约0.3 mm,表面结构相对完整均匀,但未能完全封闭基体表面原有的大孔洞.热喷涂层与混凝土基体界面粘接良好,平均附着力达3.88 MPa,超过了基体本身的抗拉强度.涂层依靠物理抓固与基体粘接,微观结构相对致密、无明显空洞或缺陷.研究旨在拓宽热喷涂应用领域及混凝土功能防护涂层材料技术体系,提升混凝土耐磨、防腐及热防护等综合保障能力.     

热喷涂涂层与基体结合界面研究进展EI北大核心CSCD

热喷涂再制造过程中,由于材料原因,涂层与基体之间往往存在一个异质界面问题。异质界面的形成与存在对再制造涂层服役性能有非常重要的影响。本文综述了热喷涂涂层与基体结合界面的研究发展现状,主要是结合界面形成机理和结合界面对涂层性能影响的研究发展现状。分析了热喷涂涂层与基体结合界面研究目前还存在的问题,并针对这些问题提出采用新技术与新手段深入研究涂层与基体结合界面的生长形成过程,揭示结合界面形成机理,并利用新表征方法实现涂层与基体结合界面形貌结构定量化表征,构建结合界面与涂层各项性能之间量化关系等的发展建议,进而为实现涂层性能的设计控制及寿命预测奠定基础。