摘要
为绿色高效提升镀锌钢的耐腐蚀性能,在热镀锌钢表面先进行铈盐/单宁酸改性硅烷钝化,再进行环氧树脂及氨基树脂封闭,并研究了样品的耐腐蚀性能及腐蚀机理。通过电化学试验和中性盐雾试验测试了材料的耐腐蚀性能,采用带有能谱仪附件的扫描电子显微镜(SEM-EDS)研究了材料的成分及微观形貌。结果表明,铈盐/单宁酸改性硅烷钝化-环氧树脂封闭样品的耐腐蚀性能最好,频率为10^(-2) Hz时阻抗模值达到10~(7.5)Ω·cm^(2)以上,极化电阻可达345 303Ω·cm^(2),防腐效率达99.98%;样品在中性盐雾试验48 h后表面几乎没有发生腐蚀;SEM-EDS结果表明,样品的表面缺陷很少。文中实验条件下环氧树脂封闭的耐腐蚀表现优于环氧树脂+氨基树脂封闭,铈盐和单宁酸的存在可以生成氧化铈等成分阻止材料进一步腐蚀,并且有助于树脂与镀锌钢板的结合,提升了材料耐腐蚀性。这种钝化方式的防腐机理主要是结合树脂的屏蔽作用、铈离子的成膜性能以及单宁酸与阳离子结合,是一种符合环保要求的性能优异的钝化方式。
In order to find a green and efficient passivation method to improve the corrosion resistance of galvanized steel,silanized cerium salt/tannic acid passivation combined with resin sealing sample was prepared,and the corrosion resistance and corrosion mechanism of the sample were studied.The surface of hot-dip galvanized steel was first passivated by silanized cerium salt/tannic acid,and then sealed by epoxy resin and amino resin.The corrosion resistance of the materials was tested by electrochemical test and neutral salt spray test.The composition and microscopic morphology of the material were studied by SEM-EDS.The electrochemical test results showed that the corrosion resistance of the samples passivated by silanized cerium salt/tannic acid and sealed by epoxy resin was the best,with the impedance modulus at 10⁻²Hz exceeding 107.5Ω·cm^(2),a polarization resistance of 345303Ω·cm^(2),and a corrosion prevention efficiency of 99.98%.After 48 hours of neutral salt spray test,the surface of the sample showed almost no corrosion;and the SEM-EDS results indicated that there were very few surface defects in the sample.Under experimental conditions in the article,the corrosion resistance performance of samples sealed by epoxy resin was better than that of samples sealed by epoxy resin+amino resin.The presence of cerium salt and tannic acid could generate cerium oxide and other components to prevent further corrosion of the materials,and enhanced the bonding between the resin and galvanized steel plate,improving the corrosion resistance of the materials.The anticorrosion mechanism of this passivation method mainly combines the shielding effect of binding resin,the film forming performance of cerium ion and the combination of tannic acid and cation,which is an excellent passivation method that meets the requirements of environmental protection.
作者
张天源
沈剑
杨乐庭
王秀娟
刘国海
鲁俊
范贤捷
刘铸汉
包梦婷
王炳棠
凤仪
ZHANG Tianyuan;SHEN Jian;YANG Leting;WANG Xiujuan;LIU Guohai;LU Jun;FAN Xianjie;LIU Zhuhan;BAO Mengting;WANG Bingtang;FENG Yi(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Hefei Hualing Co.,Ltd.,Hefei 230601,China)
出处
《涂料工业》
北大核心
2025年第4期39-46,共8页
Paint & Coatings Industry
关键词
硝酸铈
单宁酸
环氧树脂
氨基树脂
电化学性能
腐蚀机理
cerous nitrate
tannic acid
epoxy resin
amino resin
electrochemical properties
corrosion mechanism
