建筑用钢表面镀层制备与耐蚀性能研究  

Preparation and corrosion resistance of surface coatings on steel for construction

作　　者：蒋伟勤 马大朝 Jiang Weiqin;Ma Dachao(School of Civil Engineering and Architecture,Liuzhou Institute of Technology,Liuzhou 545616,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China)

机构地区：[1]柳州工学院土木建筑工程学院,广西柳州545616 [2]广西大学资源环境与材料学院,广西南宁530004

出　　处：《电镀与精饰》2024年第7期58-63,共6页Plating & Finishing

基　　金：广西科技重大专项(桂科AA23073018);广西高校中青年教师科研基础能力提升项目(2022KY1692)。

摘　　要：为了提升建筑用Q345钢的表面耐蚀性能,采用化学镀的方法在建筑用钢表面制备了Ni-P和Ni-P-PTFE(聚四氟乙烯)复合镀层,考察了PTFE乳液浓度对表面镀层显微形貌和耐蚀性能的影响。结果表明,Ni-P镀层和Ni-P-PTFE镀层中均可见非晶态结构,在镀液中加入PTFE后Ni-P-PTFE镀层中还形成了Fe_(3)C和P_(4)S_(3)相。在镀液中加入不同浓度PTFE乳液后,Ni-P-PTFE镀层的Ni/P原子比有不同程度降低(介于4.08~5.04),但随着PTFE乳液浓度增加,镀层中F元素含量逐渐升高、Ni/P原子比逐渐增大。PTFE乳液浓度为0.4 mL/L时Ni-P-PTFE镀层表面较为平整、光滑,镀层表面由于脱氢反应而形成的微孔消失。不同浓度PTFE乳液的Ni-P-PTFE镀层的耐蚀性能都优于Ni-P镀层,且PTFE乳液浓度为0.4 mL/L时镀层的耐蚀性最好,在建筑用Q345钢表面制备Ni-P-PTFE镀层可以获得良好的耐蚀性,适宜的PTFE乳液浓度为0.4 mL/L。In order to improve the surface corrosion resistance of Q345 steel for construction,Ni-P and Ni-P-PTFE (polytetrafluoroethylene) composite coatings were prepared on the surface of construction steel by electroless plating.The effect of the concentration of PTFE colloid on the surface morphology and corrosion resistance were investigated.The results showed that amorphous structures were visible in both Ni-P and Ni-P-PTFE coatings.After adding PTFE to the plating solution,Fe_(3)C and P_(4)S_(3) phases were also formed in the Ni-P-PTFE coating.After adding different concentrations of PTFE colloid into the plating solution,the Ni/P atomic ratio of the Ni-P-PTFE coating decreases in varying degrees(between 4.08 and 5.04).With the increase of the concentration of PTFE lotion,the content of F element in the coating gradually increases,and the Ni/P atomic ratio gradually increases.When the concentration of PTFE colloid is 0.4 mL/L,the Ni-P-PTFE coating surface is relatively flat and smooth,and the micropores formed on the coating surface due to the dehydrogenation reaction disappear.The corrosion resistance of Ni-P-PTFE coatings with different concentrations of PTFE colloid is better than that of Ni-P coating,and the coating has the best corrosion resistance when the concentration of PTFE colloid is 0.4 mL/L.Ni-P-PTFE coating on Q345 steel for construction can obtain good corrosion resistance,and the appropriate concentration of PTFE colloid is 0.4 mL/L.

关 键 词：建筑用钢 表面镀层 PTFE乳液浓度 显微形貌 耐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]