Effect of Nanoadditives with Surfactant on the Surface Characteristics of Electroless Nickel Coating on Magnesium-Based Composites Reinforced with MWCNT

IF 1.5 Q3 ENGINEERING, MECHANICAL

Advances in Tribology Pub Date : 2013-12-29 DOI:10.1155/2013/315965

R. Dhinakaran, R. Elansezhian, Arunachalam Arumugam Lalitha

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引用次数: 17

Abstract

An experimental investigation has been carried out on optimizing process parameters of electroless nickel-phosphorous coatings on magnesium composite reinforced with carbon nanotube. A comprehensive experimental study of electroless Ni–P coatings on magnesium composite reinforced with multiwalled carbon nanotube under specific coating conditions was performed. The electroless coating bath consists of nickel sulphate (26 g/L), sodium hypo-phosphite (30 g/L) as reducing agent, sodium acetate (16 g/L) as stabilizer, and ammonium hydrogen difluoride (8 g/L) as the complexing agent. The surfactant SLS was added in the solution for better wetting and spreading of coating on substrate. The stabilizer thiourea (1 ppm) was added in the bath to prevent decomposition of bath. Different nanoadditives such as ZnO, Al2O3, SiO with various concentrations were used in the bath and their influence on coating process characteristics were studied The nano additives such as ZnO, Al2O3, SiO were added at concentrations of 0.1%, 0.5%, 1%, and 2% in the EN bath. The output parameters such as surface roughness, microhardness, specific wear rate, and surface morphology were measured. Surface morphology was studied using scanning electron microscope. The results showed that the proposed method resulted in significant improvement on the quality of the coatings produced.

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表面活性剂纳米添加剂对MWCNT增强镁基复合材料化学镀镍表面特性的影响

对碳纳米管增强镁复合材料化学镀镍磷涂层工艺参数的优化进行了实验研究。在特定的涂层条件下，对多壁碳纳米管增强镁复合材料化学镀Ni-P涂层进行了全面的实验研究。化学镀液由硫酸镍(26 g/L)、次亚磷酸钠(30 g/L)为还原剂、乙酸钠(16 g/L)为稳定剂、二氟化氢铵(8 g/L)为络合剂组成。在溶液中加入表面活性剂SLS，使涂层在基体上的润湿性和铺展性更好。在熔槽中加入稳定剂硫脲(1ppm)，防止熔槽分解。研究了不同浓度的ZnO、Al2O3、SiO等纳米添加剂对EN镀液涂层工艺特性的影响。在EN镀液中分别添加0.1%、0.5%、1%、2%的ZnO、Al2O3、SiO等纳米添加剂。测量了输出参数，如表面粗糙度、显微硬度、比磨损率和表面形貌。用扫描电镜对其表面形貌进行了研究。结果表明，该方法可显著提高涂层的质量。

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