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超声波作用下电沉积纳米晶Co-W合金镀层
          
Electrodeposition of Co-W Nanocrystalline Alloy Coatings under Ultrasonic Irradiation Action

摘    要
在碳钢表面电沉积纳米晶Co-W合金镀层,电沉积过程中利用超声波作用提升镀层的表面硬度及耐蚀性.利用XRD、EDX和SEM对镀层的组成和微结构进行了分析.结果表明,纳米晶Co-W合金镀层为密排六方(hcp)结构,当引入40~100 W功率的超声波作用时,镀层更加平整紧密、内应力降低,镀层晶粒也得以细化;随着超声波功率的升高,镀层中钨含量不断增加;当镀层中钨的原子质量分数为26.51%时,镀层仍旧维持纳米晶状态.超声波作用下制备的镀层晶粒尺寸小、钨含量高、表面缺陷少,进而使得镀层的表面硬度和耐腐蚀性得以提升.
标    签 Co-W镀层   纳米晶   超声波   硬度   腐蚀   Co-W coating   nanocrystalline   ultrasonic irradiation   hardness   corrosion  
 
Abstract
Ultrasonic irradiation was utilized to improve the microhardness and corrosion resistance of Co-W nanocrystalline coatings on cabon steel substrate.The composition and microstructure of the coatings were characterized by XRD,EDX and SEM.The results showed that the coatings exhibited hexagonal close-packed (hcp) crystal structure,which became compact and smooth with the decrease of grain size and internal stress due to the application of a proper ultrasonic power(40-100 W).The tungsten content in coatings increased with the increase in the applied ultrasonic power.It is interesting to find that the coatings with tungsten content higher than 20% was not exhibit amorphous.Smaller grain size,higher tungsten content and lower density of surface defects favor the improvement of the hardness and of the corrosion resistance for Co-W nanocrystalline coatings.

中图分类号 TB304

 
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所属栏目 试验研究

基金项目 国家自然科学基金(51204115)

收稿日期 2014/3/14

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备注盛敏奇(1983-),副教授,博士,从事材料腐蚀与防护相关研究.

引用该论文: Lv Chen-kai,SHENG Min-qi,ZHONG Qing-dong. Electrodeposition of Co-W Nanocrystalline Alloy Coatings under Ultrasonic Irradiation Action[J]. Corrosion & Protection, 2015, 36(2): 192


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