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 107. 5 Ω·cm2以上，极化电阻可达 345 303 Ω·cm2，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。
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
Abstract: In order to find a green and efficient passivation method to improve thecorrosion 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 bysilanized 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 spraytest. 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 passivatedby silanized cerium salt/tannic acid and sealed by epoxy resin was the best，with the impedance modulus at 10-2 Hz exceeding 107. 5 Ω ·cm2，a polarization resistance of 345 303 Ω ·cm2，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 ofsamples sealed by epoxy resin+amino resin. The presence of cerium salt and tannic acid couldgenerate 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 corrosionresistance of the materials. The anticorrosion mechanism of this passivation method mainlycombines 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 meetsthe requirements of environmental protection.
Key words:
cerous nitrate,
tannic acid,
epoxy resin,
amino resin,
electrochemical properties,
corrosion mechanism
中图分类号:
张天源, 沈剑, 杨乐庭, 等. 铈盐/单宁酸改性硅烷钝化-树脂封闭对热镀锌钢耐蚀性能的影响[J]. 涂料工业, 2025, 55(4): 39-46.
ZHANG Tianyuan, SHEN Jian, YANG Leting, et al. Effect of Silanized Cerium/Tannic Acid Passivation Combined with Resin Sealing on Corrosion Resistance of Hot-dip Galvanized Steel[J]. Paint & Coatings Industry, 2025, 55(4): 39-46.