非晶态Cr-C合金镀层的制备研究

Study on Preparation of Amorphous Cr-C Alloy Coating

通过对添加剂酒石酸的优化研究,研究电沉积制备非晶态Cr-C合金镀层的新配方。用X射线衍射和扫描电子显微镜对镀层结构和形貌进行表征,并对镀层硬度及结合力进行测试。结果表明,当酒石酸加入量为40 g/L时,镀层的X射线衍射图出现非晶态的宽化峰,镀层的硬度和结合力最高,表面平整、致密,无裂纹和针孔,异类原子的加入和酒石酸对表面活性点的吸附作用是形成非晶态结构的主要原因。

A new formula used to prepare amorphous Cr-C alloy coating by electrodepositing was studied with optimization study on tartaric acid additive.The microstructure and surface morphology of the coating was detected by X-ray diffraction and SEM.The microhardness and adhesion of the coating was tested.The results show that a broad diffraction peaks appeares on the X-ray diffraction pattern and the coating has a smooth,dense surface without pinhole and crack,and has maximum microhardness and binding force when the dosage of tartaric acid is 40 g/L.The main reasons to result in generation of amorphous Cr-C alloy coating are that alien atoms mixed into Cr layer and the active point on the layer surface are adsorbed by tartaric acid in the process of electrodeposition.