弹性应力对复合防腐涂层防护性能的影响
发布时间：2019-01-02 16:27
【摘要】：为研究海洋工程防腐涂层在海水环境和结构力学响应联合作用下的防腐功能退化规律,分析了弹性应力对Q235钢板/复合防腐涂层在人工海水中的电化学阻抗谱的影响规律;同时,采用热力学方法分析了应力对水在涂层中扩散系数的影响,并对涂层中非扩散性水分含量的影响进行了探讨.结果表明:拉应力能够显著地减小涂层电阻,增大涂层吸水量,加快电解质溶液在涂层内部的扩散速率,而压应力的影响相对较小;针对所研究的涂层体系,焓对涂层中水扩散速率的影响比熵更加显著,同时涂层中非扩散性水分含量的增大能够减小水的扩散系数.
[Abstract]:In order to study the law of anticorrosion function degradation of marine engineering anticorrosive coatings under the combined action of seawater environment and structural mechanical response, the effect of elastic stress on electrochemical impedance spectrum of Q235 steel plate / composite anticorrosive coating in artificial seawater was analyzed. At the same time, the influence of stress on the diffusion coefficient of water in the coating was analyzed by thermodynamic method, and the influence of non-diffusible water content on the coating was discussed. The results show that the tensile stress can significantly reduce the resistance of the coating, increase the water absorption of the coating, accelerate the diffusion rate of electrolyte solution inside the coating, but the influence of compressive stress is relatively small. The effect of enthalpy on the diffusion rate of water in the coating is more significant than that of entropy, and the increase of non-diffusible water content in the coating can reduce the diffusion coefficient of water.
【作者单位】： 大连理工大学船舶工程学院;
【基金】：国家自然科学基金资助项目(50921001,51221961,51379031) 国家重点基础研究发展计划资助项目(2011CB013704) 工信部高技术船舶科研资助项目
【分类号】：TG174.4
，
本文编号：2398716
[Abstract]:In order to study the law of anticorrosion function degradation of marine engineering anticorrosive coatings under the combined action of seawater environment and structural mechanical response, the effect of elastic stress on electrochemical impedance spectrum of Q235 steel plate / composite anticorrosive coating in artificial seawater was analyzed. At the same time, the influence of stress on the diffusion coefficient of water in the coating was analyzed by thermodynamic method, and the influence of non-diffusible water content on the coating was discussed. The results show that the tensile stress can significantly reduce the resistance of the coating, increase the water absorption of the coating, accelerate the diffusion rate of electrolyte solution inside the coating, but the influence of compressive stress is relatively small. The effect of enthalpy on the diffusion rate of water in the coating is more significant than that of entropy, and the increase of non-diffusible water content in the coating can reduce the diffusion coefficient of water.
【作者单位】： 大连理工大学船舶工程学院;
【基金】：国家自然科学基金资助项目(50921001,51221961,51379031) 国家重点基础研究发展计划资助项目(2011CB013704) 工信部高技术船舶科研资助项目
【分类号】：TG174.4
，
本文编号：2398716
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