硅酸钾-硅溶胶基水性无机重防腐涂料的制备

以高模数硅酸钾溶液为主要原料,采用简单物理共混法与活性锌粉按1∶2.6的质量比进行物理混配制备得到水性无机富锌涂料。并系统研究了高模数硅酸钾水性无机富锌涂料的基本性能、搅拌时间,硅酸钾的模数,锌粉目数和配比对高模数硅酸钾水性无机富锌涂料的影响,结果表明,搅拌0.5~1 h,锌粉目数在400~500目左右,高模数硅酸钾模数在4.8~5.5之间,而基料∶锌粉=1∶2.6时,涂膜性能最佳。     

水性无机富锌涂料的研制

以低模数的硅酸钾溶液和硅溶胶为原料,制备成稳定性良好的高模数硅酸钾溶液。讨论了温度、硅烷偶联剂种类和搅拌速度等因素对制备高模数硅酸钾溶液的影响。比较了研制的水性无机富锌涂料和国内外同类产品的性能。介绍了水性无机富锌涂料的施工工艺。     

高模数硅酸钾及其富锌涂料的制备

研究了不同硅溶胶、硅酸钾和烷氧基硅烷对高模数硅酸钾制备的影响；探讨了温度、时间和搅拌速度对高模数硅酸钾制备的影响；进行了高模数硅酸钾富锌涂料的配方实验，并与国外样品的性能进行了比较。     

还原氧化石墨烯对水性无机富锌涂料防腐性能的影响

为提高水性无机富锌涂层的防腐性能，以高模数硅酸钾溶液和氟碳乳液为成膜物质，片状锌粉为主要功能填料，并添加适量还原氧化石墨烯分散液作为辅助填料，制备了硅酸盐水性无机富锌涂料。采用物理性能测试、电化学测试、盐雾试验等测试方法，探究了还原氧化石墨烯添加量对涂层防腐性能的影响。结果表明：加入适量还原氧化石墨烯，可以增强水性无机富锌涂料的防腐性能，当涂料中还原氧化石墨烯分散液添加量达到6%时，涂层的力学性能及耐腐蚀性最佳，经过腐蚀后的主要腐蚀产物为Zn₅(OH)₈Cl₂和ZnO。     

高模数硅酸钾溶液及其富锌涂料的制备

以低模数硅酸钾溶液、碱性硅溶胶为主要原料,采用有机硅氧烷作为改性剂制备了稳定的高模数硅酸钾溶液,与锌粉按30:70的质量比例配制富锌涂料.探讨了模数、固含量、有机硅氧烷的种类以及添加量对高模数硅酸钾溶液贮存稳定性和富锌涂料性能的影响.结果表明:硅酸钾溶液的模数在5.5、固含量在25%、γ-缩水甘油醚丙基三甲氧基硅烷(Z-6040)占总质量的3%时,贮存稳定期超过30 d(50℃),由改性后的高模数硅酸钾溶液所配制的富锌涂料涂膜致密且防腐性能优异,可作为长效重防腐涂料使用.     

水利工程钢结构用水性无机富锌涂料的制备及性能研究

简单介绍了水利工程钢结构用水性无机富锌涂料的应用要求,并对水性无机富锌涂料用原材料及制备工艺进行了阐述。重点研究了水性无机富锌涂料中基料、锌粉、硅烷偶联剂等原材料对涂料性能的影响,并进行了初步分析。结果表明:(1)采用高模数硅酸钾、硅溶胶与硅丙乳液作为涂料的基料,可以显著提高机械性能和防腐能力;(2)水性无机富锌涂料颜料选择球状锌粉和片状锌粉搭配使用,既提高了涂层的致密性,又提高了涂层外观平整度以及防腐能力。(3)硅烷偶联剂可以有效地提高水性无机富锌涂料的致密性与附着力。     

硅丙乳液改性高模数硅酸钾水性无机富锌涂料的研究

以硅溶胶、氢氧化钾为主要原料,硅丙乳液为改性剂,制备了一种稳定的高模数硅酸钾有机-无机复合基料,与锌粉以1∶2比例配制高模数硅酸钾水性无机富锌涂料.探讨了模数、固含量、反应时间、硅丙乳液用量对高模数硅酸钾溶液贮存稳定性和涂料性能的影响.采用正交实验的方法,确定了涂料的最优工艺条件.制备的水性无机富锌涂料是一种经济实用的绿色涂料.     

有机-无机杂化对无机富锌涂料性能的影响

以硅酸钾溶液与硅溶胶为原料,制备了不同模数的硅酸钾溶液,采用四甲基氢氧化铵对硅丙乳液进行催化水解,用适度水解的硅丙乳液对硅酸钾溶液与硅溶胶的反应物进行改性,制得涂料基料,通过有机-无机杂化的方式将涂料基料与锌粉按质量比1.0∶2.6进行混合,制备了一种水性无机硅酸钾富锌涂料。考察了硅酸钾溶液模数、硅酸钾溶液固含量、适度水解的硅丙乳液掺量等对水性无机富锌涂料性能的影响,并对相关作用机理进行了分析。结果表明:当硅酸钾模数为3.3,硅酸钾溶液固含量为25.0%,适度水解的硅丙乳液的添加量为硅酸钾溶液固含量的5%~10%时,涂膜的硬度为5H,柔韧性为4 mm,附着力为1级,7 d耐水性和耐人工海水性能较好,所配制涂料的综合性能优异。     

水性无机富锌底漆研制及其在重防腐领域的应用

用高模数硅酸钾溶液、锌粉及功能填料制备了水性无机富锌涂料,研究了水性无机富锌涂料性能特点,并与环氧富锌涂料进行了性能对比,阐述了水性无机富锌涂料在重防腐领域的应用情况。     

有机-无机杂化对无机富锌涂料的性能影响研究

以硅酸钾溶液与硅溶胶的反应物为基料,选用四甲基氢氧化铵对硅丙乳液进行催化水解,并以适度水解的硅丙乳液改性硅酸钾溶液与硅溶胶基料,通过有机-无机杂化的方式将其与1:2.6的锌粉进行混合,制备了一种水性无机硅酸钾富锌涂料。考察了模数、固含量、经适度水解的硅丙乳液掺量等对水性无机富锌涂料性能的影响,并对相关作用机理进行了分析。结果表明：当硅酸钾模数 为3.3,硅酸钾溶液固含量为25.0%,经适度水解的硅丙乳液的添加量为硅酸钾溶液固含量的5%～10%时,涂膜的硬度为5H,柔韧性为4mm,附着力为1级,7d耐水性和耐人工海水性能较好,所配制涂料的综合性能最优。     

Tribomechanical and microstructural properties of cathodic arc-deposited ternary nitride coatings

Sintered carbides are promising materials for surfaces that are exposed to extreme wear. Owing to their high service load, ceramic-based thin films are coated on carbides using different techniques. In this study, non-toxic and cobalt-free powder metallurgy-sintered carbide samples were coated with TiN, TiAlN, CrAlN, and TiSiN ceramic-based thin film coatings by cathodic arc physical vapor deposition. The microstructure (phase formation, coating thickness, surface roughness, and topography), mechanical properties (hardness, modulus of elasticity, and plasticity indices), and tribological properties (nanoscratch and wear behavior) of the thin film coatings were investigated. No cracks or defects were detected in these layers. The ceramic-based ternary nitride thin film coatings exhibited better mechanical performance than the TiN coating. The TiN thin film coating had the highest average surface roughness, which deteriorated its tribological performance. The ternary nitride thin film coatings exhibited high toughness, while the TiN thin film coating exhibited brittle behavior under applied loads when subjected to nanoscratch tests. The wear resistance of the ternary nitride coatings increased by nearly 9–17 times as compared to that of the TiN coating and substrate. Among all the samples investigated, the substrate showed the highest coefficient of friction (COF), while the TiSiN coating exhibited the lowest COF. The TiSiN thin film coating showed improved mechanical and tribological properties as compared to other binary and ternary nitride thin film coatings.     

耐温耐磨双组分瓷膜涂料的研制

瓷膜涂料具有高硬度、耐磨、耐腐蚀等优异特性,以甲乙两组分按一定比例混合熟化8。24h后,喷涂至工件上,于180℃烘烤20-40min,制得瓷膜涂层。研究了甲、乙组分配比,以及纳米氧化铝和碳化硅用量对涂膜综合性能的影响。通过在烫发器上的应用,进一步表明瓷膜涂料具有优异的耐温和耐磨特性。     

双组分改性聚氨酯水工防腐涂层性能研究

采用柔性材料防护水利过流部件解决其运行过程中气蚀、磨蚀及其联合作用导致的破坏问题。以化学改性的方式在聚氨酯侧链上引入氟碳链及疏水性基团,合成兼具聚氨酯弹性体、氟碳化合物双组分性能的涂层材料。通过对涂层制备过程中喷涂压力、温度等喷涂工艺参数优化制备性能最佳涂层。对材料进行疏水性、冲蚀磨损、人工老化等测试,采用扫描电镜对涂层微观形貌进行观察,分析磨蚀机理对涂层性能及防护效果影响。结果表明：所制备涂层可有效提升过流部件的防腐耐磨性能。     

氧化铝增强无机硅酸锌涂层的电化学阻抗谱研究

无机硅酸锌涂层是一种广泛使用的钢铁重防腐涂层。采用在涂料填料中加入氧化铝的方法可以得到具有更好耐磨性能的富锌涂层。本实验研究利用电化学阻抗谱法(EIS)研究了氧化铝的加入对涂层腐蚀防护性能的影响,结果表明氧化铝颗粒的加入使涂层的腐蚀防护性能略有提高。     

Electrodeposited Ni-B alloy coatings: Structure, corrosion resistance and mechanical properties

Ni-B alloy coatings with different boron content ranging from 4 to approximately 28 at.% were prepared by electrodeposition in a nickel-plating bath containing sodium decahydroclovodecaborate as a boron source. The influence of the boron concentration in the coatings on their structure, morphology, electrochemical and corrosion behavior, physico-mechanical and electrical properties was investigated using X-ray diffractometry (XRD), scanning electron microscopy (SEM), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and other methods. It was found that the electrodeposited Ni-B coatings with relatively low boron content (≤8 at.%) are nanocrystalline and comprise a solid solution of boron in f.c.c. Ni lattice having a mixed substituted-interstitial type. Further increase in the boron content (up to 10-15 at.%) leads to the appearance of heterogeneous amorphous-nanocrystalline structure, and the coatings with a high boron content (20 at.% and above) are X-ray amorphous. Polarization measurements in neutral NaCl solutions showed that the Ni-B coatings with relatively low boron content demonstrate a potential region of low anodic currents associated with the passive film formation at the alloy surface. The anodic current in this potential region increases significantly with increasing the boron content above 10 at.%, suggesting the non-protective nature of the anodic film formed on the amorphous Ni-B alloys. Immersion tests monitored by EIS measurements revealed a significantly better corrosion performance of the Ni-B coatings with low boron content (4 at.%) in comparison with that of the amorphous coatings. The microhardness and wear resistance of the Ni-B coatings essentially increases with increasing the boron content. Maximum microhardness and wear resistance were found for the coatings containing 8 at.% B.     

粘接剂对热化学反应法陶瓷耐磨性影响

采用不同的粘接剂,相同的陶瓷骨料以及固化工艺制备两种陶瓷涂层,通过相组成、结构、结合强度以及耐磨性分析讨论粘接剂对于热化学反应法陶瓷涂层耐磨性的影响,实验结果证明:粘接剂的不同不会影响到陶瓷增强相的生成,但磷酸铝粘接剂陶瓷涂层致密性和结合强度以及耐磨性均不如水玻璃粘接剂陶瓷涂层。     

Evaluation of the corrosion resistance of phosphate coatings obtained by anodic electrochemical treatment

The corrosion resistance of phosphate coating obtained by anodic electrochemical treatment at 4–6 mA/cm² is addressed in this paper. The corrosion performance of these coatings is also compared with the coatings obtained by chemical treatment. The regenerated phosphoric acid under the influence of anodic current causes a large variation in morphological features of the coatings. Immersion and salt spray tests indicate the ability of these coatings to act as a barrier film on mild steel. Polarization and electrochemical impedance spectroscopic (EIS) studies indicate that the corrosion resistance of phosphate coatings obtained by anodic treatment decreases with increase in current density employed for deposition. In spite of their higher coating weight, the corrosion resistance of phosphate coatings obtained by anodic treatment is inferior to those obtained by chemical treatment. The porosity or discontinuities created due to the dissolution of the coating under the influence of anodic current are considered responsible for the inferior corrosion resistance of these coatings. The study concludes that anodic treatment has only a limited scope for preparing phosphate coatings with improved corrosion resistance.     

Effects of graphene content in alkaline silicate electrolyte on AA1060 pure aluminum micro-arc oxidation coating

Ceramic coatings were obtained by micro-arc oxidation (MAO) on the surface of AA1060 pure aluminum in alkaline silicate electrolyte with the addition of graphene. The effects of graphene contents in the range of 0–.30 g/L in the electrolyte on surface morphology, corrosion resistance, and wear resistance of the ceramic coatings were investigated. The outer surface structure, outer surface element content, coating cross-section structure, coating cross-section element content, coating/substrate interface structure, and coating phase were characterized by scanning electron microscope and X-ray diffraction. Potentiodynamic polarization and electrochemical impedance spectroscopy were used to evaluate the corrosion behavior of MAO samples in a 3.5-wt% NaCl solution. In addition, the resistance to sliding and abrasive wear of the oxide coating were studied experimentally. The results show that the alkaline silicate electrolyte with the addition of graphene has a significant effect on the characteristics of MAO coating. The performance of micro-arc oxide coatings is best when the graphene content in the electrolyte is .15 g/L, the average thickness of the film is 7.24 μm, the average pore size is 6.07 μm, the impedance value is approximately 4.01 × 106 Ω, and its friction coefficient is .55.     

封闭型异氰酸酯固化马来酸酐聚丁二烯水性涂料的研究

以马来酸酐化低分子聚丁二烯(MALPB)为原料,通过加入过氧化物和封闭型异氰酸酯Bayhydur BL5140双固化剂体系制备了耐腐蚀性能优异的水性涂料,研究了双固化剂体系中封端型异氰酸酯固化剂BL5140对水性涂料的固化过程和性能的影响。试验结果表明:涂层厚度为20μm;硬度为3H～4H;附着力为0～1级。BL5140的加入可大幅提高涂层的耐热性能;而且BL5140的加入可提高镀锌板、镁合金的自腐蚀电位而对金属表面起到很好的保护作用,盐雾试验也表明该涂料耐蚀性能突出。