共查询到19条相似文献,搜索用时 983 毫秒
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脉冲技术电沉积铅镉合金的研究 总被引:1,自引:0,他引:1
通过对氨基磺酸盐体系中铅、镉产铅-镉镀液的阴极化曲线的研究,结果表明镀液中加入添加剂间苯二酚,显著增加电极化及改善镀层性能;用脉冲电沉积代替常规直流电沉积铅-镉,结果表明,脉冲电沉积所得镀层质量上流法有明显改善;原子吸收分光光度法测定表明,直流电沉积和脉冲电沉积可以得到不同含量的铅镉合金镀层。 相似文献
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采用直流(DC)、脉冲(PC)和超声脉冲(UPC)电沉积方式在Q235钢表面制备Ni-Sn-Mn合金镀层,利用扫描电子显微镜(SEM)、辉光放电光谱仪(GDS)、X射线衍射仪(XRD)、Tafel曲线和电化学阻抗谱(EIS)研究了不同电沉积方式对镀层表面形貌、元素含量、沉积速率、相结构和耐蚀性的影响。结果表明,分别采用直流、脉冲、超声脉冲电沉积方式制备的镀层,Ni和Sn质量分数依次减小,Mn质量分数依次增大,沉积速率依次提高;直流电沉积镀层晶粒粗大,存在裂纹和孔隙,耐蚀性较差;脉冲电沉积镀层晶粒细化,无明显缺陷,耐蚀性较高;超声脉冲电沉积镀层均匀致密,呈非晶结构,在3.5%Na Cl溶液中具有最正的自腐蚀电位(-0.346 V)、最低的自腐蚀电流密度(3.162×10~(-8)A/cm~2)和最大的电荷转移电阻(9 143Ω·cm~2),镀层耐蚀性最好。 相似文献
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以瓦特镀镍液为基础,在Q235A钢基体上分别采用直流电沉积和脉冲电沉积方法在不同温度下制备了镍镀层,采用线性扫描伏安法测试了不同温度下,Ni2+在Q235A钢基体上发生氧化还原的电化学行为;采用表面轮廓测量仪以及纳米力学测试系统对镍镀层表面粗糙度、显微硬度及弹性模量进行了表征。实验结果表明,随着电解液温度的上升,镍在电沉积过程中的极化程度会下降。直流电沉积制备的镀层在电解液θ为40℃时的粗糙度最小;脉冲电沉积制备的镀层在电解液θ为50℃时的粗糙度最小。直流电沉积及脉冲电沉积制备的镀层的显微硬度和弹性模量在电解液θ为50℃时达到最大值。 相似文献
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采用脉冲电沉积方法制得纳米晶Fe-Ni-Cr合金镀层,并研究了脉冲频率对镀层成分及结构的影响。结果表明:脉冲频率对Fe-Ni-Cr合金镀层影响很大。当脉冲频率为5 000 Hz时,FeNi-Cr合金镀层的形貌质量最好,厚度为25.41μm,其中Fe的质量分数为63.25%,Cr的质量分数为26.19%,Ni的质量分数为5.89%。脉冲频率为5 000 Hz时制备的Fe-Ni-Cr合金镀层结晶度好,晶粒尺寸为13.44nm,晶面间距为1.887nm。通过脉冲电沉积实现了材料表面纳米化,提高了材料的表面性能。 相似文献
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脉冲电镀镍及其性能的研究 总被引:3,自引:0,他引:3
采用瓦特镀镍液,研究了脉冲占空比、平均电流密度、温度对电沉积速率,镀层光亮度和镀层在w=3.5%的NaCl溶液中耐蚀性的影响.用扫描电镜研究了直流和脉冲镍镀层的表面形貌.结果表明:电沉积速率随脉冲占空比、平均电流密度及温度的增大而加快;镀层耐蚀性,光亮度随脉冲占空比增大而变差,随温度、平均电流密度的增大先变好后变差.较佳脉冲电镀条件为:平均电流密度0.75 A/dm~2,脉冲占空比5%,温度45~50 ℃,pH 2.5~3.0.X射线衍射分析结果表明,与直流镀镍相比,脉冲镍镀层在(111)晶面存在择优取向,镀层更致密,性能更好. 相似文献
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M.S. Chandrasekar 《Electrochimica acta》2008,53(8):3313-3322
A review on pulse and pulse reverse techniques for electrodeposition have been attempted. Pulse electrodeposition (PED) of some metals and alloys are reported. The effects of mass, transport, electrical double layer pulse parameters and current distribution on surface roughness and morphology are presented. Applications, advantages and disadvantages of PC and PRC techniques are discussed along with theoretical aspects and mechanism. 相似文献
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The electrodeposition of cuprous iodide (CuI) within the pores of interconnected TiO2 particles has been investigated using current pulse electrodeposition and continuous current electrodeposition techniques, both in the dark and under illumination. Under illumination, the solar cells fabricated using the electrodes prepared by pulse electrodeposition, provide a collection efficiency of 3.28% with N-719 dye, whereas those prepared by continuous electrodeposition give only 0.75% efficiency, both in the absence of triehylammine hydrothiocyanate (THT, a crystal growth inhibiter) and under simulated AM 1.5 illumination. The CuI films were also grown by combining pulse electrodeposition (without THT) with drop-by-drop solution casting (with THT). The cells prepared by these electrodes give an even higher collection efficiency of 3.85%, as compared with the 3.38% efficiency of films prepared by only solution casting CuI in the presence of THT. This is the first report of the use of pulse electrodeposition to prepare CuI for dye-sensitized solid-state solar cells. 相似文献
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Seok-Soon Kim 《Electrochimica acta》2006,51(18):3814-3819
Pt electrodes were prepared by direct and pulse current electrodeposition for use as counter electrodes in dye-sensitized solar cells. Scanning electron microscope and transmission electron microscope images confirmed the formation of uniform Pt nanoclusters of ∼40 nm composed of 3 nm nanoparticles, when the pulse current electrodeposition method was used, as opposed to the dendritic growth of Pt by the results from direct current electrodeposition. By applying pulse electrodeposited Pt which has a 1.86 times higher surface area compared to direct current electrodeposited Pt, short-circuit current and conversion efficiency were increased from 10.34 to 14.11 mA/cm2 and from 3.68 to 5.03%, respectively. In addition, a flexible solar cell with a pulse current electrodeposited Pt counter electrode with a conversion efficiency of 0.86% was demonstrated. 相似文献
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