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 silane coating with flaked Zn-Al powder on carbon steel was studied in 3.5％ NaCl solution using open circuit potential monitoring, potentiodynamic polarization, electrochemical impedance spectroscopy(EIS) and scanning electron microscope(SEM). The results indicated that the process of deterioration of the coating presented three stages with immersion. At the initial stage, the flaked zinc powder on the surface layer of the coating started to activate with the attack of the electrolyte; the middle stage showed the feature of electrochemical protection of the coating for the substrate; and the barrier protection of the coating predominated in the last stage. The middle stage lasted a long period while the third stage had a short time, suggesting a strong cathodic protection and a weak barrier mechanism of corrosion prevention of the silane coating with zinc and aluminum powder.
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