碳钢表面化学镀Ni-P及Ni-P-PTFE纳米非晶镀层研究

STUDY OF Ni-P AND Ni-P-PTFE COATINGS ON CARBON STEEL VIA ELECTROLESS DEPOSITION

用化学镀技术在碳钢表面制备Ni-P及Ni-P-PTFE纳米非晶镀层,探索镀层制备关键技术与工艺;通过扫描电镜(SEM)、X射线能谱仪(EDS)、X射线衍射技术(XRD)进行镀层微观结构、化学组成、相组成的分析与表征;用电化学参数测试及腐蚀增重评价镀层试样防腐性能。结果表明:在碳钢表面成功制备了具有非晶特点的Ni-P及Ni-P-PTFE镀层,Ni-P镀层表面致密平整,Ni-P-PTFE镀层具有表面孔洞的形貌特征;电化学测试及腐蚀增重分析表明,Ni-P镀层防腐性能良好,Ni-P-PTFE镀层则由于复合界面的存在而防腐性能稍逊,但二者均可实现对基材碳钢明显的防腐保护作用。

The Ni-P and Ni-P-PTFE coatings were experimentally electroless deposited on the surface of carbon steel in the present study.The key preparing process was explored and the as-prepared coatings of Ni-P and Ni-P-PTFE were then characterized using SEM,EDS and XRD.The electrochemical polarization curves and the weight increases of the coated samples in the seawater were conducted to assess the anti-corrosion behaviors of the two coatings.The results indicated that the Ni-P and Ni-P-PTFE coatings have been successfully electroless deposited on the surface of carbon steel.The surface microstructure observations showed that the Ni-P coating was smooth and compact rather than the Ni-P-PTFE coating.Although the results from polarization curves and weight gains indicated that the Ni-P-PTFE coating had anti-corrosion behavior slightly poorer than the Ni-P coating due to the presence of the composite interface in the Ni-P-PTFE coating,the two coatings prepared in this study could provide carbon steel with valuable protection from seawater attack.