Effect of nano-Fe2O3 particles on the corrosion behavior of alkyd based waterborne coatings

A nano-composite coating was formed by adding nano-Fe₂O₃ to a specially developed alkyd based waterborne coating system. The interaction of nano-particles with the polymer functionalities was confirmed using FTIR. Curing behavior of the coating was determined by DSC. The uniformity of coating and dispersion of nano-particles in the polymer matrix was investigated using SEM and AFM. The performance of the coating was investigated in terms of their corrosion resistance, UV-resistance, mechanical properties and optical properties. Composite coatings so formed showed enhanced, corrosion resistance, better mechanical properties such as abrasion and scratch hardness and improved UV blocking properties.     

UV固化有机硅改性聚氨酯易清洁涂层的制备及性能研究

目的 研究聚二甲基硅氧烷(PDMS)相对分子质量、官能度及添加量对紫外光(UV)固化聚氨酯丙烯酸酯易清洁涂层防污性能的影响。方法 以聚乙二醇(PEG)、异佛尔酮二异氰酸酯(IPDI)、羟基封端的PDMS和季戊四醇三丙烯酸酯(PETA)为原料,采用一锅法制备了有机硅改性聚氨酯丙烯酸酯易清洁树脂,并UV固化得到易清洁涂层。结果 添加5 000相对分子质量PDMS(PDMS–5000)的涂层比添加1 000相对分子质量PDMS(PDMS–1000)的涂层具有更高的接触角、更低的滑动角、更好的油性记号笔笔迹收缩效果和耐磨性能,但涂层透过率明显降低;添加双羟基封端的PDMS(PDMS–B)的涂层比添加单羟基封端的PDMS(PDMS–A)的涂层具有更好的油性记号笔笔迹收缩效果和耐磨性能。随着涂层中PDMS的添加量从0.5%提高到2.0%,防污性能逐渐提高。同时根据XPS分析可知,当涂层中PDMS的添加量提高到2%时,涂层表面的Si含量接近饱和,防污性能达到最佳。易清洁涂层即使经过1 000次的磨损循环测试后,依然具有油性记号笔笔迹收缩效果。结论 PDMS–B改性的聚氨酯丙烯酸酯涂层比PDMS–A改性的聚氨酯丙烯酸酯涂层具有更优异的记号笔笔迹收缩性能和耐磨性能,而且PDMS–5000改性的聚氨酯丙烯酸酯涂层比PDMS–1000改性的聚氨酯丙烯酸酯涂层具有更好的易清洁性能。当PDMS的添加量从0.5%提高到2.0%时,涂层的疏水疏油性能逐渐提高。     

SiC颗粒尺寸对镍基复合镀层耐磨性和耐蚀性的影响

在正交实验基础上,对比研究微米SiC(平均粒径1.5 μm)和纳米SiC(平均粒径20 nm)增强复合镍基镀层的摩擦磨损行为和耐腐蚀性能.通过TEM、SEM、EDX和XRD等手段研究颗粒分散状态以及复合镀层的表面和截面形貌、成分及相结构.采用球-盘滑动摩擦磨损试验机研究复合镀层的耐磨性.电化学阻抗谱测量在3.5%的NaCl水溶液中进行.结果表明:微米级颗粒增强复合镀层可以获得更高的表面硬度,两种增强复合镀层具有相似的摩擦磨损行为.电化学阻抗谱分析表明:SiC颗粒的加入可以提高镀层的耐腐蚀性,且纳米颗粒复合镀层具有更好的耐蚀性.     

酸碱复合催化溶胶-凝胶法制备 SiO2减反膜及膜性能研究

采用酸催化法、碱催化法和酸碱复合催化法制备了SiO2溶胶,进而制得SiO2减反膜。表征了薄膜的表面形貌,测定了薄膜的透射率和硬度。结果表明,不同催化溶胶制得的膜层在表面形貌、减反效果和薄膜硬度等方面存在明显差异:酸催化得到的薄膜,孔隙率和透过率最低,但硬度和抗划伤性最好;碱催化得到的薄膜,孔隙率和透过率最高,但硬度和抗划伤性最差;酸碱复合催化得到的薄膜,孔隙率、透过率、硬度和抗划伤性能介于以上二者之间,性能与酸碱复合催化溶胶的制备工艺密切相关。     

Tribological Properties of the Oxide Coatings Produced onto 6061-T6 Aluminum Alloy in the Hard Anodizing Process

The aim of this work was to establish the influence of the thickness of the anodic coatings on their mechanical properties and to understand the relation between their hardness and the abrasion resistance. The coatings were produced in the hard anodizing process onto the 6061-T6 aluminum alloy. Their thickness was in the range between 19 and 43 µm. The abrasion resistance was determined by using Taber abrasion test. The weight losses of the coatings obtained were in the range between 15 and 11 mg and decreased with their increasing thickness. It has been shown that the hardness measured on the cross sections of the coatings did not correspond to their abrasion resistance. Thus, the new approach has been proposed. The hardness of the coatings was estimated on the basis of the results of the scratch test performed at the constant load. The results obtained correspond to the abrasion resistance of the coatings.     

Effect of adding WC powder to the feedstock of WC-Co-Cr based HVOF coating and its impact on erosion and abrasion resistance

HVOF grade powders are now commercially available and being used in large scale for different components prone to abrasion/erosion. The literature on HVOF coatings based on WC-Co powder shows that there is a huge difference in hardness between the pure WC powder and WC-Co based HVOF coatings. The objective of this study was to improve the hardness of WC based HVOF coatings by adding pure WC powder to the commercially available powder. The hardness data shows that 20% addition of WC powder will improve the hardness of HVOF coating from 1106 to 1395 Hv_0.3. Hardness increase is due to the embedding of tungsten carbide hard metal matrix. This HVOF coated sample was tested for dry sand abrasion and slurry erosion as per ASTM standards. These tests show that abrasion and erosion resistance of HVOF coated samples goes down with the addition of tungsten carbide powder even though coating hardness has gone up. To understand the negative trend, porosity and SEM studies were carried out. SEM studies show that the porosity of the HVOF coating is higher than the conventional HVOF coating. With increase in WC content (30%), the porosity of the HVOF coating increased up to 10%. The higher porosity is believed to be the reason for poor abrasion and slurry erosion resistance.     

Effect of slurry mechanical damage on the properties of an organic coating system

Organic coatings are the most commonly used system for protection from corrosion of a metallic product. The required properties of paints include protection from corrosion phenomena, resistance to abrasion and good aesthetic aspect. This is particularly important for the automotive and transport industry, building trade, domestic products, and packaging.The aim of this work is to investigate the effect of wet abrasion and erosion on the protective and aesthetic properties of an organic coating system. Falling abrasive test and Taber test were chosen to produce the mechanical damage, using different abrasive slurries in order to evaluate the influence of the viscosity of the liquid mean and the hardness and shape of the abrasive agents. The level of aesthetic damage was evaluated through gloss measurements; 20° was the most sensitive angle to gloss changes; with this geometry, samples with different damage level could be compared. The correlation between the changes of gloss and the damage was investigated using optical microscopy and environmental scanning electron microscopy. The level of loss of protective properties was evaluated through electrochemical impedance spectroscopy measurements.     

某油气田项目316L不锈钢海底管道表面绝缘涂层的筛选

某海上油气田开发项目设计要求对316L海底管道内表面涂覆涂层以保证绝缘。分别在316L不锈钢表面涂覆7种涂层,通过高温高压反应釜模拟海底管道内部服役环境进行浸泡试验,对比浸泡试验前后涂层的表观、附着力、耐磨性、硬度、剪切强度、耐划伤等性能。结果表明:涂层2、涂层5和涂层3等3种涂层性能优异,这为油气田开发工程设计的涂层选择提供了参考依据。     

POSS改性丙烯酸涂层的耐刮擦及紫外防护性能

丙烯酸树脂基涂层具有良好的耐候性,但其力学性能较差,耐刮擦及摩擦磨损性能不足等缺点易导致其使用寿命降低。为改善其耐刮擦及摩擦磨损性能,进一步提高其耐候性和延长使用寿命,采用溶胶凝胶法合成了八乙烯基多面体低聚倍半硅氧烷(OvPOSS),进一步将其与丙烯酸树脂(PMB)原位复合改性制备了不同OvPOSS添加量的有机无机杂化树脂。利用光镜、接触角测量仪、显微硬度仪等表征了OvPOSS改性树脂制备的涂层在紫外辐照前后的表面形貌、接触角、硬度等;采用纳米划痕仪和摩擦试验机研究了涂层改性前后的耐刮擦和摩擦磨损性能。结果表明：当添加OvPOSS质量分数为10%时,改性涂层的各方面性能最佳。与未改性的丙烯酸涂层相比,OvPOSS的加入显著改善了OvPOSS/PMB复合涂层的硬度,抗紫外线性,耐刮擦和摩擦磨损等性能。     

无限冷激铸铁表面等离子束合金化强化研究

利用优化的等离子束工艺参数对无限冷激铸铁表面进行合金化强化处理,并经650℃高温回火处理,获得高硬度、耐磨的合金化层组织.利用扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计对等离子束合金化层进行分析,并对摩擦磨损性能进行了分析.试验结果表明,合金化层与基体之间实现了冶金结合,并形成了以莱氏体、马氏体、碳化物为主的显微组织,合金化层的细晶强化和回火弥散析出强化等强化作用,使显微硬度高达1200 HV0.2,合金化加回火处理后的耐磨性相对于基体提高了大约2倍.     

Effect of plasma surface treatment on mechanical and corrosion protection properties of UV-curable sol-gel based GPTS-ZrO2 coatings on mild steel

Hybrid sol-gel based nanocomposite coatings derived from hydrolysis and condensation of a photopolymerizable silane precursor 3-Glycidoxypropyltrimethoxy silane in combination with zirconium-n-propoxide were deposited on mild steel substrates by a dip coating technique. In some cases, substrates were subjected to an atmospheric air-plasma surface pre-treatment prior to coating deposition. The coatings were subsequently densified by exposure to ultraviolet radiation followed by a thermal treatment at 250 °C. Characterization of the coatings with respect to thickness, water contact angle, pencil scratch hardness, adhesion and abrasion resistance was carried out. Corrosion testing was carried out on the coatings for a 1 h exposure to a 3.5% NaCl solution by electrochemical polarization and impedance measurements. The hybrid sol-gel coatings were found to improve the mechanical properties and corrosion resistance of mild steel. Plasma surface pre-treatment was found to improve the adhesion of coatings significantly and decreased the corrosion rate from 0.2652 mpy obtained for coatings without any surface pre-treatment to 0.0015 mpy, which was nearly 600 times lower than that of bare mild steel.     

CeO2-filled sol–gel coatings for corrosion protection of AA2024-T3 aluminium alloy

Hybrid organic–inorganic sol–gel-matrices, with up to 20 wt.% incorporated ceria nanoparticles, have been employed as coatings for an AA2024-T3 aluminium alloy. The morphology of the coatings and associated nanoparticles has been examined by conventional and high-resolution transmission electron microscopy, revealing a relatively uniform distribution of 5 nm size nanoparticles across the coating thickness. Electrochemical studies indicate a general beneficial effect of incorporation of ceria nanoparticles, although the performance of the coated alloy depends on the nanoparticle content. Electrochemical polarisation behaviour revealed that the coating decreased the anodic current density by about seven orders of magnitude compared with the uncoated alloy, with high breakdown potentials in chloride-containing solution. Accelerated salt spray testing showed that corrosion in an artificial scratch is blocked most efficiently by high ceria contents, whereas general corrosion is inhibited effectively with comparatively low ceria contents. Electrochemical impedance spectroscopy indicated degradation of the barrier properties of coatings with increased amounts of incorporated nanoparticles. Assessment of the abrasion and scratch resistance, and hydrophobicity also revealed additional beneficial functional properties of the coatings containing nanoparticles.     

Micro-scale Abrasion and Medium Load Multiple Scratch Tests of PVD Coatings

THIN film coatings such as titanium nitride(TiN)orDiamond Like Carbon(DLC)are commonly used toprovide wear resistance to tools and mechanicalcomponents.Many tests have been developed to assesstheir characteristics;these tests can determine thehardness,the adhesion and the wear resistance of thecoatings;they can be performed as part of a QualityControl(QC)procedure or as a way of investigating thecoatings properties.As wear by abrasion is an important cause of wearproblems in industry and…     

钛合金表面百微米级Ti/TiN多层复合涂层性能研究

目的提高TiN硬质涂层的厚度及各项力学性能。方法采用等离子增强PVD技术在钛合金(TC4)基体表面制备多层复合Ti/TiN涂层,对涂层进行扫描电镜(SEM)分析,采用划痕法表征涂层的结合强度,用维氏显微硬度计测试涂层的显微硬度,利用销盘式摩擦磨损试验仪评价涂层的摩擦磨损性能。结果制备的多层复合Ti/TiN涂层厚度最高可达100μm,且未发生剥落等失效,结合强度相对于单层TiN提高了近3倍。由于Ti、TiN的多层复合调制作用,制备的Ti/TiN显微硬度测试表明复合涂层的显微硬度高达2700 HV0.025,同时,涂层在原有耐磨性能优良的基础上具备自润滑减摩作用,经过近20 000 m的磨损测试,复合涂层的摩擦系数低至0.25左右,且未完全失效。结论多层复合结构能够有效提高TiN硬质涂层的厚度,制备的Ti/TiN多层复合涂层的各项力学性能显著提高。     

Abrasive wear resistance of plasma-sprayed glass-composite coatings

A ball-milled mixture of glass and alumina powders has been plasma sprayed to produce alumina-glass composite coatings. The coatings have the unique advantage of a melted, ceramic secondary phase parallel to the surface in an aligned plateletlike-composite structure. The alumina raises the hardness from 300 HV for pure glass coatings to 900 HV for a 60 wt.% alumina-glass composite coating. The scratch resistance increases by a factor of 3, and the wear resistance increases by a factor of 5. The glass wears by the formation and intersection of cracks, while the alumina wears by fine abrasion and supports most of the sliding load. The wear resistance reaches a maximum at 40 to 50 vol.% alumina, above which there is little further improvement. This critical alumina content corresponds to the changeover from a glass to a ceramic matrix.     

Metallurgical Characteristics of TiAlN/AlCrN Coating Synthesized by the PVD Process on a Cutting Insert

TiAlN/AlCrN coating was deposited on a tungsten carbide insert, using the plasma-enhanced physical vapor deposition (PEPVD) process. The microstructure of the coating was examined and it was found that the TiAlN/AlCrN coating was uniform, highly dense, and less porous. The different phases formed in the coating were analyzed using the x-ray diffraction. The hardness and scratch resistance were measured using the nanoindentation tester and scratch tester, respectively. TiAlN/AlCrN exhibited higher hardness, higher Young’s modulus, and superior scratch resistance when compared to the conventional coatings, such as TiAlN, AlCrN, and TiN. The surface morphology of the coating was characterized using the atomic force microscope (AFM). The surface roughness was found to be lesser in the TiAlN/AlCrN coating. The TiAlN/AlCrN coating has proved to have better corrosion resistance, compared to the uncoated carbide substrate.     

Effect of Submicron and Nano SiC Particles on Erosion Wear and Scratch Behavior of Plasma-Sprayed Al2O3/8YSZ Coatings

This paper reports studies into the effect of submicron and nano SiC particles on microstructure, phase composition, hardness, erosion wear, and scratch behavior of Al₂O₃-20wt.%8YSZ (ZrO₂ + 8 wt.% Y₂O₃) coatings fabricated by atmospheric plasma spraying. The failure mode of erosion wear and scratch for coatings was established and analyzed. The hardness, density, erosion wear, and anti-scratch resistance of coatings fabricated from plasma treating feedstocks were higher than that of coatings made from sintering feedstocks. The erosion wear rate of coatings with SiC was evidently decreased, and there was some small debris on worn surface with characteristic of translamellar fracture. The spallation, fracture, plough, and cracking were main failure mechanism for coatings. In the scratch process, the critical load of coating with SiC was increased. The crack growth resistance of coatings was analyzed from crack length at end of scratch test.     

Corrosion and Nano-mechanical Behaviors of Magnetron Sputtered Al-Mo Gradient Coated Steel

A gradient three-layer Al-Mo coating was deposited on steel using magnetron sputtering method. The corrosion and nano-mechanical properties of the coating were examined by electrochemical impedance spectroscopy and nano-indentation tests and compared with the conventional electroplated cadmium and IVD aluminum coatings. Electrochemical impedance spectroscopy was performed by immersing the coated specimens in 3.5% NaCl solution, and the impedance behavior was recorded as a function of immersion time. The mechanical properties (hardness and elastic modulus) were obtained from each indentation as a function of the penetration depth across the coating cross section. The adhesion resistance of the coatings was evaluated by scratch tests on the coated surface using nano-indentation method. The results show that the gradient Al-Mo coating exhibits better corrosion resistance than the other coatings in view of the better microstructure. The impedance results were modeled using appropriate electrical equivalent circuits for all the coated systems. The uniform, smooth and dense Al-Mo coating obtained by magnetron sputtering exhibits good adhesion with the steel substrate as per scratch test method. The poor corrosion resistance of the later coatings was shown to be due to the defects/cracks as well as the lesser adhesion of the coatings with steel. The hardness and elastic modulus of the Al-Mo coating are found to be high when compared to the other coatings.     

氟硅树脂改性紫外光固化易清洁涂层的制备及性能研究

目的 以聚氨酯丙烯酸酯为基体树脂、氟硅树脂为添加剂,制备一种具有疏水、防涂鸦和耐磨性能的紫外光固化易清洁光滑涂层。方法 首先采用氨基甲酸酯化反应合成一种含硅氧烷结构的三官能度丙烯酸酯单体（TATES）。然后以1H,1H,2H,2H-全氟辛基三甲氧基硅烷（POTS）、丙基三甲氧基硅烷（MPMS）、TATES为原料,通过水解-缩聚法制备了一系列氟硅树脂（AFSR）。最后将AFSR添加到聚氨酯丙烯酸酯树脂中,经紫外光固化得到氟硅树脂改性的聚氨酯易清洁涂层。系统地研究了AFSR添加量对涂层润湿性、自清洁、防涂鸦及耐磨性的影响。结果 氟含量为92.6%（物质的量分数）的AFSR在PUA中的添加量为2.5%时,涂层表面的水和十六烷的接触角分别为112.6°和66.3°,且拥有很低的水和十六烷滑动角。随着涂层中AFSR添加量从0.5%增加到2.5%,防污性能逐渐提高,具有明显的油性记号笔收缩和自清洁效果,并且易清洁涂层经过3 000次的摩擦循环后,仍具有良好的收缩效果和持久的防污性能,表明涂层具有优异的耐磨性能。结论 随着AFSR添加量的增加,涂层中氟硅含量增加,表面能降低,使得涂层拥有高的接触角与...     

Abrasion resistance of thin film coatings as measured by diffuse optical scattering

In this study, the abrasion resistance of a reflective thin film multilayer system consisting of Chromium Nitride (CrN_x) layers deposited on specially prepared coated polymeric substrates is presented. The abrasion resistance is quantified by the Bayer abrasion test, and then correlated with the physical properties of the film. Their resistance to abrasion is identified as being defined partially by the microstructure of the layers within the multilayer system. Relative measures of the abrasion resistance are made by quantifying the surface roughness in the specific case where the substrate is the same (hardness and elastic moduli) and the elemental and phase composition of the coating is the same. Importantly, the optical measurement of the diffuse reflectance is used to assess the relative structure of the coatings prior to the abrasion test. By doing so, a useful, non-destructive technique is presented for characterising the relative abrasion resistance of sputtered thin film coatings.