聚多巴胺-聚偏氟乙烯复合膜在304不锈钢上的制备及防腐性能  

Preparation of polydopamine–polyvinylidene fluoride composite coating on 304 stainless steel and its anticorrosion property

作　　者：史亚伟[1] 郑洪加 李润骋 韩东梅[1] 杨卫岐[1] 

机构地区：[1]中山大学中法核工程与技术学院,广东广州510000

出　　处：《电镀与涂饰》2017年第16期866-869,共4页Electroplating & Finishing

摘　　要：采用自组装的方法用多巴胺盐酸盐溶液在经过抛光处理的304不锈钢表面形成一层聚多巴胺(PDA)薄膜,然后采用刮涂法用聚偏氟乙烯(PVDF)溶液在经过聚多巴胺改性后的不锈钢表面形成涂层。通过纳米压痕法研究了PDA–PVDF复合涂层与不锈钢基底之间的相互作用,测量了复合涂层的水接触角。借助动电位极化曲线测量和电化学阻抗谱研究了复合涂层的抗腐蚀性能。结果表明,PDA薄膜改性后的304不锈钢样品表面与PVDF涂层的粘附性大大增强,复合涂层修饰过的304不锈钢表面疏水性增强,耐腐蚀性得到了提升。A polydopamine （PDA） thin film was formed on polished 304 stainless steel by self-assembly method with a dopamine hydrochloride solution. A polyvinylidene fluoride （PVDF） coating was then coated on the PDA-modified stainless steel surface. The interaction between PDA-PVDF composite coating and stainless steel substrate was studied by nanoindentation method. The water contact angle of the composite coating was measured, and its anticorrosion property was examined by potentiodynamic polarization curve measurement and electrochemical impedance spectroscopy. The results showed that the adhesion of PVDF coating to stainless steel substrate is improved greatly by PDA modification. The hydrophobicity and corrosion resistance of 304 stainless steel are enhanced by modification with the composite coating.

关 键 词：聚多巴胺 自组装 聚偏氟乙烯 复合涂层 不锈钢:疏水性 防腐蚀 

分 类 号：TG174.46[金属学及工艺—金属表面处理] TG178[金属学及工艺—金属学]