纳米钛基杂化材料对水性环氧涂层组织结构和耐蚀性能的影响  

Effect of Nano-titanium Polymer on Microstructure and Corrosion Resistance of Water-based Epoxy Coatings

作　　者：焦志强 魏世丞 韩庆[1] 王博 陈建设[1] 李斌川[1] JIAO Zhi-qiang;WEI Shi-cheng;HAN Qing;WANG Bo;CHEN Jian-she;LI Bin-chuan(Northeastern University,Shenyang 110819,China;National Key Laboratory for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China)

机构地区：[1]东北大学,沈阳110819 [2]陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《表面技术》2023年第9期189-198,共10页Surface Technology

基　　金：国家重点研发计划(2019YFB2005300);国家自然科学基金(51905543);国防科技卓越青年科学基金(2017-JCJQ-ZQ-001);中国博士后科学基金(2018M643857)。

摘　　要：目的研究不同纳米钛基杂化材料含量对水性环氧树脂涂层组织结构和耐腐蚀性能的影响。方法以纳米钛基杂化材料为填料,采用物理共混法对水性环氧涂料进行改进,通过铅笔硬度测试、十字划格附着力测试、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、电化学测试以及盐雾试验等方法对涂层的力学性能、微观形貌、组织结构及耐蚀性能进行检测。结果随着纳米钛基杂化材料含量的增加,涂层硬度逐渐上升,由HB变为3H,并且涂层的附着力保持为0级,同时涂层的防腐性能随纳米钛基杂化材料含量的增加先增强后减弱。当纳米钛基杂化材料质量分数为10%时,涂层最为致密,涂层的腐蚀电位最高,为‒1.0249 V,腐蚀电流密度最小,为8.09×10^(‒8)A/cm^(2),涂层低频部分的阻抗模值最大,为7.6×10^(5)Ω·cm^(2),较纯水性环氧树脂涂层提升了3倍,并且在60d的盐雾试验后涂层表面状况最佳,表现出良好的防腐性能。结论纳米钛基杂化材料可以明显改善环氧树脂乳胶颗粒团聚的现象,提升涂层的致密性,增加涂层的铅笔硬度,增强涂层的防腐性能。To study the effect of different nano-titanium polymer(NTP)contents on the microstructure and corrosion resistance of water-based epoxy resin coatings.In this experiment,NTP was used as fillers to improve the water-based epoxy coatings for the first time by physical blending.Pencil hardness test,cross-cut adhesion test,scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FT-IR),electrochemical test and salt spray test were taken to detect the microscopic morphology,microstructure and anti-corrosion properties of the coatings.The pencil hardness of the coating was improved from HB to 3H by adding NTP and all coating adhesion grades were 0,which indicated good adhesion between the coating and the substrate.SEM test results showed that adding NTP could significantly reduce the agglomeration of epoxy resin latex particles,but agglomeration would occur when NTP was added in excess.Only when the addition amount was 10wt.%,the surface defects of the coating were the least.EIS tests were performed on the coatings.And the results of each group of coatings were fitted with two different models.The penetration process of corrosive medium in the coating was analyzed by fitting the results and the improvement mechanism of NTP on the coating was explained by combining the SEM results:NTP could significantly alleviate the agglomeration of epoxy resin latex particles and could participate in the cross-linking curing reaction of the coating to enhance the denseness of the coating,but it could not be added in excess.When the addition amount of NTP was 10wt.%,the coating was the densest and the capacitive arc radius of the coating in the high frequency band was the largest,and the impedance modulus value in the low frequency band was the largest,which was three times higher than that of the pure water-based coating.The results of Tafel curve showed that the addition of NTP positively shifted the corrosion potential of the coating.When the content of NTP was 10wt.%,the corrosion potential of the coating was the

关 键 词：纳米钛基杂化材料 水性环氧树脂 组织结构 防腐性能 电化学测试 

分 类 号：TG172[金属学及工艺—金属表面处理]