Ce(SO4)2浓度对电喷镀Ni-W-Ce合金镀层性能影响

Effect of Ce(SO4)2 Concentration on Properties of Ni-W-Ce Alloy Coating by Jet-Electrodeposition

摘要:

为了研究Ce(SO4)2浓度与合金镀层表面性能的关系，采用喷射电沉积法制备了一系列Ni-W-Ce合金镀层工件。用扫描电镜(SEM)观察了镀层的表面结构，并用能谱仪(EDS)检测镀层中的元素组成。XRD分析表明，镀层存在晶格畸变。LEXT4100激光共焦显微镜观察磨损痕迹，发现磨损机理发生了变化。结果表明，添加Ce(SO4)2改善了涂层的表面微观形貌，当浓度为0.5g/L时，涂层的表面质量最佳。同时，显微硬度、耐磨性和耐腐蚀性随浓度的增加呈现先好后坏的规律。当Ce(SO4)2浓度为0.5g/L时，显微硬度达到峰值519.69HV0.1。此时，镀层耐磨性最好，其耐磨性表征参数均取得最小值。且镀层的耐蚀性也最好，腐蚀电位为-0.5537V，电弧电抗半径最小。

Abstract:

In order to investigate the relationship between Ce(SO₄)₂ concentration and surface performance, a series of workpieces coated with Ni-W-Ce alloy was fabricated by Jet-Electrodeposition. The cellular structure was observed by SEM, and the composition of coating elements was analyzed by EDS. XRD analysis showed that the coating had lattice distortion. LEXT4100 laser confocal microscope observed wear mark and found that the friction mechanism was to be changed. The results indicate that the addition of Ce(SO₄)₂ improved the surface micromorphology of the coating, and the best surface quality occurred when the concentration is 0.5g/L. Meanwhile micro-hardness, wear resistance and corrosion resistance show a rule of first getting better and then getting worse with the concentration increasing. When the concentration of Ce(SO₄)₂ is 0.5g/L, the micro-hardness reached the peak value of 519.69HV_0.1.The wear resistance was the best as the wear resistance mark parameters dropped to the valley value. The corrosion resistance was also the best, which the corrosion potential was -0.5537V and the arc reactance radius of the minimum.