凹凸棒土-CeO2对舰船高温排烟管表面复合镀层组织和抗氧化性能的影响

目的 提高舰船高温排烟管表面的抗氧化性能.方法 采用电沉积和化学镀技术,在舰船高温排烟管用16Mn表面制备纳米复合镀层.通过抗高温氧化性试验,研究凹凸棒土、稀土氧化物CeO2对复合镀层抗氧化性能的影响,并通过扫描电子显微镜和光学显微镜对复合镀层的微观形貌、组织结构进行分析.结果 当镀液中纳米凹凸棒土颗粒的质量浓度小于1.5 g/L时,随凹凸棒土浓度的增加,复合镀层晶粒细化,镀层致密,且随着镀液中纳米CeO2颗粒浓度的增加,镀层表面平整、致密;当镀液中凹凸棒土的质量浓度为0.5 g/L时,氧化增重最小,复合镀层的抗氧化性最好;复合镀层的氧化增重随镀液中的CeO2浓度先降低后增加,当镀液中CeO2的质量浓度为1.5 g/L时,复合镀层的抗氧化性最好.结论 镀液中添加凹凸棒土和纳米CeO2对复合镀层氧化物形貌和抗氧化性产生了明显的影响.

Effect of Attapulgite-CeO2 on the Microstructure and Oxidation Resistance of the Composite Coating on the Surface of Exhaust Pipe of Ship

Objective To improve the oxidation resistance of exhaust pipe of ship. Methods In this paper, the nano composite coating was obtained on the surface of exhaust pipe of ship by electro/ electroless deposition techniques. The effect of CeO2 on the oxidation resistance of the composite coating was studied by high temperature oxidation test, and the micro-morphology and microstructure of nano composite coating were analyzed by scanning electron microscope and optical microscope. Results When the concentration of nano attapulgite particles in the plating liquid was lower than 1. 5 g / L, the grains of composite coating became refiner and more compact with the increase of the attapulgite concentration; and the coating surface became smoother and denser with the increasing concentration of nano-CeO2 particles. When the attapulgite clay concentration in the plating liquid was 0. 5 g / L, the oxidation weight gain of composite coating was the minimum and the oxidation resistance was the best. The oxidation weight gain of composite coatings increased firstly and then decreased with the increasing concentration of nano-CeO2 particles. When the CeO2 concentration was 1. 5 g / L, the composite coating had the highest antioxidant activity. Conclusion The addition of nano attapulgite and nano CeO2 in the plating solution had a significant effect on the morphology and antioxidation performance of the composite coatings.