环保型环氧涂层在盐雾中的劣化行为研究及不同性能参数间相关性初探  

Degradation Behavior of Environmentally Friendly Epoxy Coatings in Salt Spray and Preliminary Study on the Correlation between Different Performance Parameters

作　　者：张寒露 李自强 曹京宜 梁京龙 赵旭辉 唐聿明 左禹[2] ZHANG Hanlu;LI Ziqiang;CAO Jingyi;LIANG Jinglong;ZHAO Xuhui;TANG Yuming;ZUO Yu(Unit 92228,Chinese People's Liberation Army,Beijing 100072,China;Key Laboratory of Carbon Fiber and Functional Polymer,Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]中国人民解放军92228部队,北京100072 [2]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《装备环境工程》2025年第2期87-95,共9页Equipment Environmental Engineering

摘　　要：目的研究Q235碳钢/环保型环氧涂层在盐雾试验中的失效过程和电化学行为,探索主要性能参数之间的相关性。方法采用电化学阻抗(EIS)和开路电位(OCP),结合附着力测试、扫描电镜观察,研究水性环氧涂层和无溶剂型环氧涂层失效过程主要性能参数变化及其与涂层保护性能的关系,利用皮尔逊相关性数学方法探讨各参数之间的相关性。结果当|Z|_(0.01 Hz)降至1×10^(7)Ω·cm^(2)左右时,OCP快速下降,f_(b)达到10~2Hz,附着力衰减率接近30%,电镜下基体表面可观察到腐蚀产物。当|Z|_(0.01 Hz)降至1×10^(6)Ω·cm^(2)附近时,OCP稳定在?0.45 V(vs.SCE)附近,附着力衰减率接近45%,涂层出现锈点。低频阻抗|Z|_(0.01 Hz)、OCP、附着力和特征频率f_(b)四者之间均具有较强的相关性(相关系数r值为0.60~0.96)。结论水性环氧涂层的吸水过程与溶剂型环氧涂层不同,不存在明显的吸水饱和平台。低频阻抗|Z|_(0.01 Hz)、OCP、附着力和特征频率f_(b)可以作为评价涂层保护性能的重要参数。The work aims to study the failure processes and electrochemical behaviors of environmentally friendly water-borne epoxy coatings on Q235 carbon steel in salt spray test and explore the correlation between the main performance parame-ters.The changes of main performance parameters during the failure process of waterborne epoxy coatings and solvent-free ep-oxy coatings and their relationship with the protective properties of coatings were studied by electrochemical impedance tech-nique(EIS),open-circuit potential(OCP),adhesion test and scanning electron microscope(SEM)and the correlation between some performance parameters was studied by Pearson correlation mathematical method.When the low-frequency impedance modulus|Z|0.01 Hz dropped to about 1×10^(7)Ω·cm^(2),the OCP decreased rapidly,the break point frequency f_(b) reached 102 Hz,the decay ratio of the adhesionwas close to 30%.At this time,corrosion products were observed on the steel substrate surface un-derneath the coating by SEM.When the|Z|0.01 Hz decreased to around 1×10^(6)Ω·cm^(2),the OCP stabilized close to-0.45 V(vs.SCE),the adhesion decayed close to 45%,and meanwhile small rust spots were observed on the coating.There were strong cor-relations(correlation factor r is 0.60~0.96)between the|Z|0.01 Hz,the OCP,the adhesion and the f_(b).The water absorption process of waterborne epoxy coatings is different from that of solvent-based epoxy coatings,and there is no obvious water absorption saturation platform.Low-frequency impedance|Z|0.01 Hz,OCP,adhesion and characteristic frequency f_(b) can be used as important parameters to evaluate the protective properties of coatings.

关 键 词：水性环氧 溶剂型环氧 电化学阻抗 性能参数 相关性 性能评估 

分 类 号：TG174[金属学及工艺—金属表面处理]