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采用一种含有氢氟酸的酸性溶液作为活化溶液,对钛合金表面进行化学镀镍。讨论了活化液、络合剂、Ni2 及H2PO2-浓度、缓冲剂及温度的确定。分别介绍了除膜、活化、预镀镍及化学镀镍工艺规范。对该镀镍层的耐蚀性及含磷量进行了测定,并对该镀层热处理前后的硬度、厚度、结合力、氢含量、耐磨损性及表面微观形貌进行了测试与比较。结果表明,采用本工艺可在钛合金表面沉积出70μm左右的镍磷合金镀层,磷含量在8%~11%(质量分数);氢含量可控制在50mg/kg;经200℃热处理1h后镀层硬度达到600HV,镀层与基体结合力好;经350℃热处理1h后镀层硬度达850HV,耐磨损性良好。该镀层可满足航空钛合金部件的要求。 相似文献
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3.2 镀层性能的研究 3.2.1 化学镀Ni-P合金层的沉积速度和Ni-P合金层中磷的含量化学镀Ni-P合金层沉积速度平均为28μm/h。Ni-P层中磷的含量平均为10%,镍的含量为90%。 3.2.2 Ni-P合金层与基体间的结合力测试 相似文献
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The initial nickel deposition for the direct electroless nickel plating on non-catalytically active magnesium alloy is critical. The surface morphology and composition of the initial nickel plating coating are obtained by means of the scanning electron microscopy (SEM) and the energy dispersive X-ray (EDS). In addition, the mass gain/loss in the initial nickel deposition process was measured by using the electrobalance. The results showed that the MgO coating was gradually corroded by the plating solution, at the same time, MgF2 produced by F , H and MgO was deposited on the substrate during the initial electroless plating process. The nickel of the initial electroless plating was mostly growing on the boundary between the MgF2 coating and the MgO coating of the activation substrate, and then came to two sides. After that, the Ni-P coating growth rate to cover with the MgF2 coating was prior to the MgO coating. The electroless plating was in company with the substrate corrosion, but the electroless plating rate catalyzed by the exchanged nickel was more than the substrate corrosion rate. 相似文献
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在机械传动轴用40Cr钢基体上制备了化学镀Ni-P合金镀层,并对化学镀Ni-P合金镀层的厚度、表面粗糙度、结构、表面形貌及耐蚀性进行了研究。结果表明:化学镀Ni-P合金镀层属于立方结构,结晶度较好;化学镀Ni-P合金镀层表面呈现出均匀、致密的颗粒状形貌,厚度约为6.5 pm;化学镀Ni-P合金镀层的自腐蚀电位为一0.305 V,自腐蚀电流密度为36.72 ptA/cm2,耐蚀性较好。 相似文献
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在由硫酸镍31g/L、次磷酸钠22g/L、乙醇酸30g/L、乙酸钠13g/L、二甲胺0.8g/L、全氟乙基碘化铵0.1g/L及重晶石(即硫酸钡)0~25g/L组成的稳定镀液中,采用化学镀的方法在低碳钢上制备了Ni-P-BaSO4复合镀层.其表面形貌采用扫描电镜进行分析,耐蚀性以动电位极化及电化学阻抗谱测试.镍-磷合金基... 相似文献
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SiCp/Al复合材料化学镀镍工艺的研究 总被引:4,自引:0,他引:4
采用在高体分碳化硅增强铝基复合材料表面化学沉积Ni-P合金镀层的方法来改善焊接性能.本文用特殊的前处理工艺,在复合材料表面形成结合牢固、光亮、致密、均匀、连续的Ni-P合金镀层,并观察了镀层形貌和镀覆过程的差异.将不含贵金属钯的活化液应用于该复合材料的活化过程,不仅成功地化学沉积上良好的镍磷镀层,而且能够大大降低成本.采用X射线衍射、扫描电子显微镜、能谱对基体材料和镀层的结构、表面和截面的微观状态、元素组成进行了测试.结果表明:在酸性镀液中获得的镀层是微晶结构,属于中磷镀层;在碱性镀液中获得的镀层是晶态的,属于低磷镀层. 相似文献
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