摘要： 【目的】为了提高醇酸清漆的防腐性，制备了一种棉花状纳米 Co₃O₄缓蚀剂。【方法】采用扫描电子显微镜（ SEM）、 X射线粉末衍射仪（ XRD）及傅立叶变换红外光谱仪（ FT-IR）对棉花状纳米 Co₃O₄进行表征。采用极化曲线、交流阻抗、盐水浸泡腐蚀试验及吸水率试验研究了添加棉花状纳米 Co₃O₄的醇酸涂层的性能。【结果】纯醇酸涂层腐蚀电流密度为 42. 24 μA/cm²，清漆中棉花状纳米  Co₃O₄的质量分数为 0. 12%~0. 25%时，腐蚀电流密度为 1. 02~1. 56 μA/cm²经过 20 d盐水浸泡腐蚀试验，复合涂层只是轻微腐蚀，而纯醇酸涂层腐蚀非常严重，复合涂层吸水率降低到 4%左，右，而纯醇酸涂层吸水率超过 12%。【结论】棉花状纳米  Co₃O₄能显著改善醇酸清漆的防腐性能。

关键词: 清漆, 醇酸树脂, 棉花状纳米 Co₃O₄, 涂层, 腐蚀

Abstract: ［Objective］In order to improve the anticorrosive property of alkyd varnish，a cotton-like nano  Co₃O₄ corrosion inhibitor was prepared.［Methods］The cotton-like nano- Co₃O₄ was characterized by scanning electron microscopy（SEM）， X-ray powder diffractometer（XRD） and infrared spectrometer（FT-IR），respectively. The performance of the alkyd coating with the addition of cotton-like nano-Co3O4 was tested by polarization curve，electrochemical impedance spectroscopy，salt water immersion corrosion test and water absorption rate test.［Results］The corrosion current density of pure alkyd coating was 42. 24 μA/cm²，and the corrosion current density was 1. 02-1. 56 μA/cm² when the mass fraction of cotton-like nano- Co₃O₄ in the varnish was 0. 12%-0. 25%；the composite coating was only slightly corroded，while the pure alkyd coating was very seriously corroded after 20 d salt water immersion corrosion test；the water absorption rate of the composite coating was reduced to about 4%， while the absorption rate of the pure alkyd coating was more than 12%.［Conclusion］The cotton-like  Co₃O₄ nanomaterial could significantly improve the anticorrosion performance of alkyd varnish.

Key words: varnish, alkyd resin, cotton-like nano Co₃O₄, coating, corrosion

中图分类号: 

• TQ635.2&emsp