纳米SiO2改性环氧涂层海洋腐蚀规律  

Marine Corrosion Law of Epoxy Coatings Modified by Nano-SiO_2

作　　者：田惠文[1,2] 李伟华[1] 侯保荣[1] 

机构地区：[1]中国科学院海洋研究所,山东省腐蚀科学重点实验室,青岛266000 [2]中国科学院研究生院,北京100049

出　　处：《腐蚀与防护》2010年第7期515-519,577,共6页Corrosion & Protection

基　　金：国家科技支撑计划:海洋工程钢筋混凝土结构防腐关键技术及示范工程项目(2007BAB27B03);中国科学院知识创新工程重要方向项目(KZCXZ-YW-210)

摘　　要：以本实验室开发的无溶剂环氧防腐蚀涂料专利配方为纳米复合涂层的载体，通过9个周期的模拟海洋环境挂片腐蚀失重试验，研究了该涂层在大气区、浪溅区、潮差区和全浸区的基本腐蚀规律，结合强极化稳态电化学试验对结果进行了验证。分析发现海气界面区的腐蚀电流密度是全浸区的5～10倍，其腐蚀速度主要受阴极还原反应控制；大气区和全浸区主要发生均匀的全面腐蚀，而浪溅区和潮差区则发生以点腐蚀为主要形式的较为严重的局部腐蚀。The solvent-free epoxy heavy duty coatings with the patent formulation of our laboratory were used as the basic carrier for nano-SiO2, 9 cyclical sea simulation tests were performed in order to study the corrosion laws of the nano-hyhrid coating/steel samples hanged in different zones of marine environment such as atmospheric zone, splash zone, tidal zone and immersion zone, and then the potentiodynamic polarization curves were tested to prove the test results. The results showed that the corrosion current density in the air-sea interface zone was 5-10 times of that in the immersion zone. The corrosion rate was primarily controlled by cathodic reducing reaction. The general corrosion mainly took place in the atmospheric and immersion zones, but the pitting corrosion appeared in the splash and tidal zones.

关 键 词：纳米SIO2 环氧涂层 海洋腐蚀规律 极化曲线 腐蚀形貌 

分 类 号：TG174.46[金属学及工艺—金属表面处理]