共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
3.
采用复合电沉积技术制备了Ni-Fe-TiO2复合镀层.通过正交实验对复合电沉积工艺进行了优化,并对所得镀层的硬度、耐蚀性等综合性能进行了表征.结果表明:当TiO2的质量浓度为3g/L时,镀层的耐蚀性最好,硬度明显提高,此时TiO2微粒沉积在镀层中. 相似文献
4.
Ni-α-Al2O3纳米复合电镀工艺条件的研究 总被引:4,自引:0,他引:4
将纳米α-Al2O3浆料ABN加入基础镀镍液中进行电沉积,获得了Ni-α-Al2O3纳米复合镀层,并对其工艺条件进行了较详细的研究.结果表明:随着镀液中纳米粉体含量的增加,沉积速率减小,而共析量和耐蚀性都是先增加,达到最大值后下降;随着电流密度的增加,沉积速率和耐蚀性增加,而共析量先增加后下降;随着搅拌强度的增大,3个测定量都是先增加后降低;随着pH值的增大,3个测定量都是先增大,然后达到一定值后几乎保持不变;电镀时间对沉积速度与共析量的影响不明显.确定了适宜的工艺范围:纳米粉体浓度为25~30 g/L,电镀时间为10~15 min,电流密度为3~4 A/dm2,pH值为3.7~4.5,通气搅拌强度为1.8~2.2 m3/h,电镀温度为45~55 ℃. 相似文献
5.
为了改进钢材表面性能,采用复合化学镀技术制备( Ni-P) -Al2O3纳米微粒复合镀层,由于纳米微粒独特的物理化学特性致使使得到的复合镀层具有多种优良性能.通过Ni-P合金镀层、(Ni-P) -Al2O3纳米微粒复合镀层和热处理后的(Ni-P) -Al2O3纳米微粒复合镀层硬度和耐磨性能测试,得出(Ni-P)-Al2... 相似文献
6.
对随热处理温度升高Ni-Mo-P、(Ni-Mo-P)-Al2O3及(Ni-Mo-P)-聚苯硫醚镀层的耐蚀性能变化作了对比研究;并对(Ni-Mo-P)-聚苯硫醚镀层进行表面复合涂敷,研究了涂敷后试样的截面形貌及其耐蚀性,结果表明,(Ni-Mo-P)-聚苯硫醚镀层耐蚀性良好,高温(85℃)10%H2SO4腐蚀速率为Ni-Mo-P镀层的1/3;复合涂敷层具有极良好的耐蚀性,涂敷层与镀层间无明显间隙。 相似文献
7.
8.
为了进一步提高Ni-W-P合金镀层的硬度和耐蚀性,用脉冲电沉积法制备了(Ni-W-P)-TiO2复合镀层,并研究了镀液中TiO2加入量对镀层硬度和表面形貌的影响,且通过极化曲线和电化学阻抗谱研究了镀层在3.5%NaCl溶液中的耐蚀性能。结果表明,(Ni-W-P)-TiO2复合镀层的性能优于Ni-W-P镀层,而当镀液中TiO2质量浓度为6g/L时,复合镀层的硬度较高,表面形貌及耐蚀性能较优。自腐蚀电位较正,腐蚀电流密度较小,极化电阻较大,其交流阻抗谱对应的电阻值也较大。 相似文献
9.
10.
11.
This paper focused on the corrosion resistance of cold spray Al–Al_2O_3composite coatings used on carbon steel pipe surfaces under thermal insulation. Al–Al_2O_3coatings were produced on the carbon steel pipe surface by cold spray(CS) technology. Experimental apparatus was built to test the corrosion resistance of coatings beneath mineral wool insulation under isothermal, thermal cycling and wet/dry conditions. The results showed that when α-Al_2O_3 was added in spraying powder, the coating could obtain higher hardness and a denser microstructure. From corrosionunder-insulation(CUI) tests, Al–Al_2O_3CS coatings were proven to be efficient in protecting carbon steel pipe from CUI mainly owning to lamellar microstructures of coatings. There was no evidence to show that α-Al_2O_3 might bring any negative effect on corrosion resistance. Al–Al_2O_3CS coatings were sensitive to the chloride ion concentration. When these coatings were exposed to higher concentrations of NaC l, the coating's exhibited faster degradation. 相似文献
12.
向Zn-Ni合金镀液中加入AI2O3溶胶,获得了Zn-Ni-AI2O3复合镀层。研究了A12O3溶胶的体积分数对镀层的相结构、表面形貌、横截面形貌、显微硬度、耐磨性及耐蚀性的影响。结果表明:当A12O3溶胶的体积分数低于6 mL/L时,不会对镀层的相结构产生影响。但当A12O3溶胶的体积分数较高时,会改变镀层的相结构,并影响镀层的致密性。当AI2O3溶胶的体积分数为6 mL/L时,镀层的耐磨性和耐蚀性均最佳。 相似文献
13.
在乙醇中,分别以盐酸、醋酸为催化剂,以正硅酸乙酯、钛酸正丁酯、硝酸铝、氧氯化锆为金属醇盐前躯体,通过分步水解法制备了SiO2-TiO2-Al2O3-ZrO2复合溶胶,利用浸渍法将陈化后的复合溶胶涂覆到不锈钢表面制得透明的复合涂层。对SiO2-TiO2-Al2O3-ZrO2复合涂层进行了差热分析(DTA)、失重分析(TG)、红外光谱(IR)、X射线衍射分析(XRD)以及耐HCl、CuSO4和FeCl3溶液浸泡腐蚀实验。结果表明,涂层中存在TiO、SiO、AlO键的氧化物网状结构,其XRD图中出现了锐钛矿和板钛矿的相结构。该涂层致密,具有良好的耐蚀性能。 相似文献
14.
15.
16.
17.
Nano-composite coatings were formed by incorporating 3 wt% nano-ZnO in a polyurethane-based waterborne coating. The nano-ZnO based composite coatings were applied on standard phosphated steel panels by cathodic electrodeposition. The electrodeposited nano-composite coatings were then baked for 20 min at 165 °C. To investigate the corrosion resistance of the coatings, the coated panels were immersed in 3.5 wt% NaCl solutions for 2880 h (120 days). The improvement in corrosion performance of the composite coatings was evaluated using electrochemical impedance spectroscopy technique. It was found that the films containing nano-sized ZnO particles show a corrosion resistance of 2 orders of magnitude higher than that of the neat films. 相似文献
18.
19.