还原氧化石墨烯对Ni-P化学镀层的组织结构和性能的影响

Effects of RGO on the Microstructure and Properties of Ni-P Electroless Coating

目前将还原氧化石墨烯(RGO)相关的复合材料用于低碳钢复合镀防护的研究较少。在Q235钢上进行Ni-P-还原氧化石墨烯(RGO)化学复合镀,利用X射线衍射仪、扫描电镜、显微硬度计分析了不同RGO添加量对Ni-P-RGO复合镀层的晶体结构、表面形貌和硬度的影响,通过全腐蚀浸泡试验测试Ni-P-RGO复合镀层的腐蚀速率,通过极化曲线和电化学阻抗谱研究Ni-P-RGO复合镀层在3.5%NaCl溶液中的电化学腐蚀行为。结果表明,Ni-P-RGO复合镀层为非晶结构。硬度测试、全腐蚀浸泡、极化曲线和电化学阻抗谱结果表明,RGO添加量为60 mg/L时镀层的硬度最高、耐腐蚀性能最好。

At present,there are few researches on the composite materials related to reduced graphene oxide(RGO)for composite plating protection of low carbon steel.Ni-P-reduced graphene oxide composite coating was prepared on Q235 steel by electroless composite plating.The crystal structure,morphology and hardness of the Ni-P-RGO composite coating at different added content of RGO were analyzed using X-ray diffractometer,scanning electron microscope and microhardness tester.The corrosion rate of Ni-P-RGO composite coating was measured by total immersion corrosion test.The electrochemical corrosion behavior of Ni-P-RGO composite coating in 3.5%NaCl solution was examined by polarization curves and electrochemical impedance spectroscopy.Result showed that the Ni-P-RGO composite coating was amorphous.The hardness test,immersion corrosion test,polarization curves and electrochemical impedance spectroscopy result indicated that when the added content of RGO was 60 mg/L,Ni-P-RGO composite coating had the best hardness and corrosion resistance.