共查询到19条相似文献,搜索用时 156 毫秒
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在45钢表面进行Ni-P合金化学镀取代2Cr13不锈钢作为异型材挤出定型模板用材。同磨损、腐蚀试验结果和实际应用表明,以45钢为基体的表面Ni-P合金镀层具有优异的防腐耐磨性能,作为塑料异型材挤出定型模板用材是经济实用。 相似文献
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化学镀Ni—P合金与热处理复合工艺在铸模中的应用 总被引:1,自引:0,他引:1
简述了化学镀Ni-P合金和热处理复合工艺的理论依据,电解液组成和工艺条件;详细地研究了Ni-P镀层和复合涂层的耐腐蚀、耐磨性能和结构以及在铸模中的应用效果。 相似文献
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铜合金化学镀Ni—P表面强化的探讨 总被引:4,自引:2,他引:4
研究了铜合金化学镀Ni-P合金的工艺条件:时效温度、时效时间对镀层晶态转变、硬度与基体结合力的影响,比较了化学镀前后的耐磨性、耐蚀性。结果表明,化学镀Ni-P合金后,铜合金的表面硬度、耐磨性、耐蚀性都显著提高。 相似文献
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化学镀Ni—W—P合金研究 总被引:2,自引:0,他引:2
在化学镀Ni-P合金的基础上,添加钨酸盐获得Ni-W-P镀层。研究了各工艺参数对镀层成分,镀层性能的影响,并利用X射线衍射分析了热处理对镀层结构和性能的影响。 相似文献
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在自行研制的腐蚀磨损试验机上,研究了腐蚀学地化学镀Ni-P合金腐蚀磨损行为的影响。结果表明,当NaCl浓度为3.5%时,化学镀Ni-P合金的腐蚀磨损速率,摩擦系数和腐蚀磨损协同作用率具有峰值特性。NaCl浓度升高将引起Ni-P合金的自腐蚀电位负移,温度升高将引起Ni-P合金的腐蚀磨损率增大,协同作用率上升。化学镀Ni-P合金可以作为G105钢在NaCl溶液中抵抗腐蚀磨损的表面改性材料。 相似文献
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化学镀镍合金的功能分类及应用 总被引:9,自引:0,他引:9
综述了化学镀镍Ni-P,Ni-B,Ni的三元合金等镀层及复合化学镀镍合金镀层的特性。根据其特性从功能的角度进行了分类,并对化学镀镍合金的最新应用作以概述。 相似文献
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在自行研制的腐蚀磨损试验机上,研究了腐蚀学因素对化学镀Ni-P合金腐蚀磨损行为的影响。结果表明,当NaCl浓度为3.5%时,化学镀Ni-P合金的腐蚀磨损速率、摩擦系数和腐蚀磨损协同作用率具有峰值特性。NaCl浓度升高将引起Ni-P合金的自腐蚀电位负移,温度升高将引起Ni-P合金的腐蚀磨损速率增大,协同作用率上升。化学镀Ni-P合金可以作为G105钢在NaCl溶液中抵抗腐蚀磨损的表面改性材料。 相似文献
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W.X. Zhang 《Surface & coatings technology》2007,201(8):4594-4600
A phosphate-manganese conversion film was proposed as the pretreatment layer between Ni-P coating and AZ91D magnesium alloy substrate, to replace the traditional chromium oxide plus HF pretreatment. The subsequent Ni-P deposited on the layer was also characterized by its structure, morphology, microhardness and corrosion-resistance. The pretreatment layer on the substrate not only reduces the corrosion of magnesium during Ni-P plating process, but also reduces the potential difference between the matrix and the second phase. Thus, a Ni-P coating with fine and dense structure was obtained on the AZ91D magnesium alloy, which shows better corrosion resistance than the Ni-P with chromium oxide plus HF as pretreatment. 相似文献
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以长效自润滑耐磨、耐蚀复合镀层制备技术,采用45#钢为基体材料、Ni-B为基底合金、Ni-W-P为基质合金、添加耐磨人造金刚石微粒和固体润滑剂(CF)n微粒,镀制Ni-B和Ni-W-P/金刚石-(CF)n双层复合镀层。试验结果表明:该工艺得到的Ni-B和Ni-W-P/金刚石-(CF)n双层复合镀层表面光亮,质感均匀,粗糙度为Ra0.2;镀层结合力良好;耐蚀性优良;经过相同次数磨损试验,磨损量仅为未镀试件的21.2%。 相似文献
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Coating Ni-P films on AZ31 magnesium alloys via electroless plating and organic coatings (organsilicon heat-resisting varnish), was studied. An organic coating was proposed as the interlayer between Ni-P coating and AZ31magnesium alloy substrate, to replace the traditional chromium oxide plus HF pretreatment. The Ni-P deposited on the interlayer was also characterized by its structure, morphology and corrosion-resistance. The interlayer on the substrate not only reduces the corrosion of magnesium during Ni-P plating process, but also reduces the potential difference between the matrix and the second phase. The result of the cross-cut test indicates the adhesion between the substrate and the interlayer is good enough. A Ni-P film with fine and dense structure was obtained on the AZ31 magnesium alloy. The electrochemical measurements show that the sample with Ni-P film exhibits lower corrosion current density and more positive corrosion potential than the substrate. Furthermore, the Ni-P coating on the AZ31 magnesium alloy exhibits high corrosion resistance in the rapid corrosion test illustrated in this paper. The method proposed in this work is environmentally friendly: no fluoride or hexacalent chromium compounds are used. In addition, it provides a new concept for plating the metals, which are considered difficult to plate due to high reactivity. 相似文献
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目的探寻无氰镀银层高温变色的原因,以增强无氰镀银层的防高温变色性能。方法采用硫代硫酸盐体系在紫铜片上镀银,并进行无惰性气体保护的300℃×1 h烘烤。借助扫描电镜(SEM)观察镀层高温烘烤后的微观形貌,采用能谱仪(EDS)检测镀层中各元素的含量与分布,探讨银层厚度、供电方式、后处理工艺对镀层防高温变色性能的影响。结果当直流电镀层厚度达到9μm,脉冲电镀层厚度达到6μm时,镀层经高温烘烤后不变色。而经水溶性银保护剂、重铬酸钾、PMTA处理后的镀层(厚6μm)均在高温烘烤后发生了变色情况。扫描电镜观察显示,高温变色镀层表面有凸起状裂纹,能谱仪检测到有铜原子外渗现象。结论高温下铜原子的外渗导致了镀层变色。采用脉冲方式进行电镀,可以使镀银层孔隙率降低。通过增加镀银层厚度和采用脉冲电镀,能够提高镀银层的防高温变色性能。 相似文献
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为了赋予镁合金微弧氧化(MAO)涂层以导电特性,对MAO涂层进行化学镀铜处理。通过测试镀层的显微组织、耐蚀性和导电性,研究镀覆温度和络合剂浓度对化学镀铜层性能的影响。结果表明,最优镀覆温度为60℃,最佳络合剂浓度为30 g/L。在此条件下,可获得完整、致密的镀层。分析镀层在镁合金MAO涂层上的形成机制,提出镀覆过程的三阶段模型。镀后试样的表面方阻在经历第三阶段后降低至0.03Ω/。通过化学镀铜,MAO样品在未明显降低耐蚀性的同时获得了良好的导电性。 相似文献