非晶态Cr-C合金镀层制备及其耐腐蚀性

以酒石酸为添加剂,采用电沉积法制备了非晶态Cr-C合金镀层。用X射线衍射、扫描电子显微镜及能谱仪对镀层结构、形貌及成分进行表征,并对镀层进行电化学耐腐蚀性测试。结果表明,当酒石酸加入量为40g/L时,镀层的X射线衍射图出现非晶态的特征峰,镀层表面平整、致密,无裂纹和针孔,与普通晶态Cr镀层相比,非晶态Cr-C合金镀层具有更优良的耐腐蚀性能。

Preparation and Corrosion Resistance of Amorphous Cr-C Alloy Coating

Amorphous Cr-C alloy coating was prepared by electrodepositing in tartaric acid additive bath.The microstructure,composition and surface morphology of the coating were detected by X-ray diffraction,SEM and EDS,also the microhardness,electrochemical corrosion resistance of the coating were tested.The results showed that a broad diffraction peak appeared on the X-ray diffraction pattern,the coating had a smooth and dense surface without pinhole and crack when the dosage of tartaric acid was 40 g/L.Compared with conventional crystalline Cr coating,amorphous Cr-C alloy coating had better corrosion resistance.