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首页> 外文期刊>American Journal of Chemical Engineering >Effects of Diamond Nanoparticles on the Microstructure, Hardness and Corrosion Resistance of Chromium Coatings
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Effects of Diamond Nanoparticles on the Microstructure, Hardness and Corrosion Resistance of Chromium Coatings

机译：金刚石纳米粒子对铬涂料微观结构，硬度和耐腐蚀性的影响

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摘要

Electrodeposited coatings of chromium and diamond nanoparticles on steel were obtained. The chromium is plated directly on the steel matrix without any intermediate layers. The influence of the electrodeposition current density, the electrodeposition time and the concentration of diamond nanoparticles in the chromium-plating electrolyte on the microstructure, the phase composition, the microhardness and the corrosion resistance of the chromium coatings were investigated. The phase and chemical compositions of the composite coating (chromium and diamond nanoparticles) were examined using X-ray Diffraction (XRD) and Scanning Electron Microscopy - Energy-Dispersive X-ray Spectroscopy (SEM-EDS) techniques. The microstructure and microhardness were examined with a metallographic microscope and a microhardness tester. The corrosion resistance was investigated in 3.5 wt % NaCl solution using the gravimetric method. The bond between the chromium coating and the steel matrix has diffusion character. A sublayer of separate irregular shape formations appears at concentration of diamond nanoparticles 25 g/l and more. The formation of these structures depends only on the concentration of diamond nanoparticles and is not influenced by the other electrodeposition parameters. With the increase of the concentration of diamond nanoparticles in the electrolyte the rate of chromium coating deposition increases and respectively the thickness of the coating increases also. This increase is more than twice the thickness of chromium coating without nanodiamonds. The microhardness of the composite coatings rises also compared to unmodified chromium coating. With the increase of the concentration of the diamond nanoparticles 2 times greater microhardness is achieved and up to 5 times greater corrosion resistance compared to monochromium coating. The values of the other electroplating parameters are constant.
机译：获得铬的电沉积涂层和金刚石纳米粒子上的钢。将铬直接镀在钢基质上而没有任何中间层。研究了电沉积电流密度，电沉积时间和金刚石纳米粒子浓度在微结构，相相组合物，微硬度和铬涂料的耐腐蚀性中的影响。使用X射线衍射（XRD）和扫描电子显微镜 - 能量分散X射线光谱（SEM-EDS）技术检查复合涂层（铬和金刚石纳米粒子）的相和化学组成。用金相显微镜和微硬度测试仪检查微观结构和显微硬度。使用重量法在3.5wt％NaCl溶液中研究了耐腐蚀性。铬涂层和钢基质之间的粘合具有扩散特征。单独的不规则形状形成的子层出现在金刚石纳米颗粒25g / L等内的浓度。这些结构的形成仅取决于金刚石纳米粒子的浓度，并且不受其他电沉积参数的影响。随着电解质中金刚石纳米颗粒的浓度的增加，铬涂层沉积速率增加，并且涂层的厚度也增加。没有纳米金刚石的铬涂层厚度的两倍多。与未改性的铬涂层相比，复合涂层的显微硬度也上升。随着金刚石纳米颗粒的浓度的增加，与单色涂层相比，实现了更大的微硬度，达到了更大的微硬度，耐腐蚀性越大较高的5倍。其他电镀参数的值是恒定的。

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