碳钢表面硅烷锌铝涂层的腐蚀电化学行为  

CORROSION ELECTROCHEMICAL BEHAVIOR OF Zn-Al SILANE COATING ON CARBON STEEL

作　　者：周文娟[1] 许立坤[1] 王佳[2] 李宁[1] 薛丽莉[1] 陈光章[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护国防科技重点实验室,青岛266071 [2]中国海洋大学化学化工学院,青岛266100

出　　处：《金属学报》2007年第9期983-988,共6页Acta Metallurgica Sinica

基　　金：国防基础科研资助项目

摘　　要：在碳钢表面制备了一种由硅烷粘结剂和鳞片状锌铝粉所组成的硅烷锌铝涂层.研究了该涂层/碳钢体系在3.5%NaCl溶液中的腐蚀电化学行为.结果表明,该涂层的作用过程可以分为3个阶段:浸泡初期为表层的金属粉活化,中期为电化学保护,后期主要为阻挡层保护.硅烷锌铝涂层的阻挡层作用较弱,阴极保护为其主要防护机理.The corrosion electrochemical behavior of a Zn-Al silane coating on carbon steel was studied in 3.5%NaCl solution using open circuit potential monitoring, potentiodynamic polarization, electrochemical impedance spectroscopy （EIS） and scanning electron microscopy （SEM）. The results indicated that the action process of the coating during immersion presented three stages. At the initial stage, the flaked zinc powder on the surface layer of the coating started to activate due to the attack of the electrolyte. In the middle stage, the coating exhibited electrochemical protection for the substrate. For the third stage, the barrier protection of the coating predominated. The middle stage lasted a longer period than the third stage, indicating a strong cathodic protection and a weak barrier mechanism of corrosion prevention of the Zn-Al silane coating.

关 键 词：锌铝涂层 硅烷 腐蚀 电化学阻抗谱 碳钢 

分 类 号：TG142.2[一般工业技术—材料科学与工程]