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通过OCP和EIS对3种无溶剂环氧防腐涂层在60℃不同流速(2,4和6 m/s)下,含1%(质量分数)石英砂的模拟海水环境中的失效行为进行了研究,并利用CLSM观察了冲刷后涂层的表面形貌,利用SEM和EDS对涂层底部Q345E钢表面的腐蚀产物进行了分析,探讨了无溶剂环氧防腐涂层在模拟海水冲刷条件下的失效机理。结果表明,冲刷条件下,3种涂层的失效过程大大缩短,流速对水在涂层中的传输速率影响不明显,涂层加速失效的原因主要有两点:一方面,砂粒对涂层的磨损作用导致涂层表面产生凹坑或孔洞,缩短了腐蚀介质扩散到达涂层/金属界面的距离;另一方面,流速加速了Cl-在涂层中的传输从而使涂层失效加速。
The failure behavior of three kinds of solvent-free epoxy anticorrosive coatings in simulated seawater with 1% (mass fraction) quartz sand at different flow rates of 2, 4 and 6 m / s at 60 ℃ was investigated by OCP and EIS The surface morphology of the coatings after scouring was observed by CLSM. The corrosion products of Q345E steel on the bottom of the coating were analyzed by SEM and EDS. The effects of solvent-free epoxy anticorrosive coatings Failure mechanism. The results show that under the condition of scouring, the failure process of the three kinds of coatings is greatly shortened, the influence of the flow rate on the transmission rate of the water in the coating is not obvious. There are mainly two reasons for the accelerated failure of the coating: on the one hand, Abrasion can lead to pits or holes in the coating surface, shortening the distance that the diffusion of the corrosion medium reaches the coating / metal interface. On the other hand, the flow velocity accelerates the transmission of Cl-in the coating and accelerates the coating failure.