ZHU Jinhai*,JIANG Fazheng,WANG Keqi.Effect of Additives on Corrosion Resistance of Conversion Coating on 6063 Aluminum Profiles[J].Plating & Finishing,2022,(10):17-23.[doi:10.3969/j.issn.1001-3849.2022.10.003]
添加剂对建筑6063铝型材表面转化膜耐蚀性能的影响
- Title:
- Effect of Additives on Corrosion Resistance of Conversion Coating on 6063 Aluminum Profiles
- Keywords:
- additives ; 6063 aluminum alloy ; conversion film ; film thickness ; corrosion resistance
- 分类号:
- U463.343
- 文献标志码:
- A
- 摘要:
- 为了提升建筑铝型材的耐蚀性能,采用转化膜处理法在 6063 铝型材表面制备了 Ce-Mn 转化膜,对比分析了无添加剂和加入硼酸、硫酸锆、氟化钠、氟化氢、氟硼酸钠和氟锆酸钠作为添加剂时转化膜的成膜速度和耐蚀性能,并探讨了添加剂的作用机理。结果表明:当添加剂为氟化钠和氟硼酸钠时,形成黄色转化膜的时间为 8 min ,优于无添加剂时黄色转化膜形成时间( 16 min )。 Ce-Mn 转化液中加入添加剂后得到的转化膜对耐点滴时间和耐浸泡时间的影响趋势相同,即氟化钠、氟化氢和氟硼酸钠的添加可以起到减缓剂的作用。点滴试验、浸泡试验、极化曲线和电化学阻抗谱测试结果相吻合,即添加剂为氟化钠、氟硼酸钠和氟化氢时可以提升转化膜的耐腐蚀性,这主要与 6063 铝合金表面形成了 Mn 和 Ce 的氧化物和氢氧化物,阻碍了腐蚀介质与铝合金基体发生反应有关。 6063 铝合金 Ce-Mn 转化液中适宜的添加剂为氟化钠。
- Abstract:
- : In order to improve the corrosion resistance of architectural aluminum profiles , Ce-Mn conversion film was prepared on 6063 aluminum profile by conversion coating method. The film forming speed and corrosion resistance of the conversion films without additives and with boric acid , zirconium sulfate , sodium fluoride , hydrogen fluoride , sodium fluoborate and sodium fluozirconate as additives were compared and analyzed , and the action mechanism of additives was also discussed. The results showed that when the additives were sodium fluoride and sodium fluoborate , the formation time of yellow conversion film was 8 min , which was better than that of the yellow conversion film without additives ( 16 min ) . The effect of additives on the drip resistance time and soaking resistance time was same , and the addition of sodium fluoride , hydrogen fluoride and sodium fluoborate can act as a mitigating agent. The results of drip test , immersion test , polarization curve and electrochemical i mpedance spectroscopy were consistent , and the corrosion resistance of the conversion film can be improved when the additives were sodium fluoride , sodium fluoborate and hydrogen fluoride. This was mainly related to the formation of Mn and Ce oxides and hydroxides on the surface of 6063 aluminum alloy , which hindered the reaction between the corrosion medium and the aluminum alloy matrix. The results showed that the suitable additive for Ce-Mn conversion solution on 6063 aluminum alloy was sodium fluoride.
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备注/Memo
收稿日期: 2021-09-06 修回日期: 2021-10-25 作者简介: 朱金海( 1980 —),男,硕士,副教授, email : 13507788005@139.com 基金项目: 2021 年度广西高校中青年教师基础能力提升项目( 2021KY1419 );国家自然科学基金( 51201017 ); 广西科学研究与技术开发计划(桂科合 14125008-1-17 )