采用赫尔槽试验、分散能力测定法、扫描电镜、X射线衍射、能谱分析、硬度测量及交流阻抗谱,研究指甲花萃取物(主要成分为2-羟基-1,4-萘醌)对镍从瓦特镀液中电沉积(以低碳钢为基体)的影响.在温度40 ～ 50℃和pH 4.5～ 5.0的条件下,从含60 mL/L指甲花萃取物的瓦特镀镍液中得到的镀层具有良好的耐蚀性和硬度.指甲花萃取物作为瓦特镀镍液的添加剂,极大地提高了镀液的分散能力和电流效率.在最佳指甲花萃取物浓度下所得的镀镍层为晶态,结晶细致.
The effect of henna extract (mainly composed of 2-hydroxy-1,4-naphthoquinone) on electrodeposition of nickel in Watts bath on mild steel was evaluated by Hull cell test,throwing power determination,SEM,XRD,EDAX analysis,hardness measurement,and AC impedance spectroscopy.The deposit obtained from the Watts bath with 60 mL/L of henna extract at temperature 40-50 ℃ and pH 4.5-5.0 has good corrosion resistance and high mierohardness.Henna extract plays a major role as an additive in the Watts bath,greatly improving the throwing power and current efficiency of the bath.At the optimal concentration of henna extract,the nickel deposit obtained was found to be crystalline and fine-grained.
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