• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Investigation on the composition and corrosion resistance of cerium-based conversion treatment by alkaline methods on aluminum alloy 6063
【24h】

Investigation on the composition and corrosion resistance of cerium-based conversion treatment by alkaline methods on aluminum alloy 6063

机译：铝合金碱性方法对铈基转化处理的组成和耐腐蚀性研究6063

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Cerium conversion coating (CeCC) and Ce–Mo conversion coating (CeMCC) were prepared on aluminum alloy 6063 (AA6063) by immersion in alkaline conversion baths. Surface morphology and composition of the conversion coatings were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). And electrochemical measurements were used to assess corrosion performance of the coatings. The SEM observations showed that CeMCC possessed a smoother and more uniform structure than CeCC, and the thickness of CeCC and CeMCC was about 0.8 and 1.2 μm respectively. The XPS depth analysis indicated that CeMCC contained a considerable amount of molybdenum and the cerium content was higher than that of CeCC at all coating depths. CeCC comprised of Al _(2) O _(3) , Ce _(2) O _(3) , CeO _(2) , and cerium hydroxides, and the composition of CeMCC also included MoO _(2) , MoO _(3) , Al _(2) (MoO _(4) ) _(3) and Na _(2) MoO _(4) besides the above mentioned components. A potentiodynamic polarization (PDP) test revealed that the corrosion current density ( i _(corr) ) values for bare alloy and CeCC were 13.36 and 4.38 μA cm ~(?2) respectively in 3.5 wt% NaCl solution, while CeMCC exhibited the lowest i _(corr) value of 0.24 μA cm ~(?2) , about two orders of magnitude lower than that of the substrate. Furthermore, the results obtained from both a cupric sulfate drop test and electrochemical impedance spectroscopy (EIS) characterization suggested that CeMCC possessed higher corrosion resistance in comparison with CeCC.
机译：通过浸入碱性转化浴中，在铝合金6063（AA6063）上制备铈转化涂层（CECC）和CE-MO转化涂层（CEMCC）。通过扫描电子显微镜（SEM）和X射线光电子谱（XPS），表征转化涂层的表面形态和组成。和电化学测量用于评估涂层的腐蚀性。 SEM观察结果表明，CEMCC具有比CECC更平滑，更均匀的结构，CECC和CEMCC的厚度分别为约0.8和1.2μm。 XPS深度分析表明CEMCC含有相当多的钼，铈含量高于所有涂层深度的CECC。 CECC由Al _（2）O _（3），CE _（2）O _（3），CEO _（2）和氢氧化铈，以及CEMCC的组成也包括MOO _（2），MOO _ （3），Al _（2）（moo _（4））_（3）和na _（2）moo _（4）除了上面提到的组件。电位动力学极化（PDP）测试显示裸合金和CECC的腐蚀电流密度（I _（COR））分别为3.5wt％NaCl溶液中的裸合金和CECC的值为13.36和4.38μAcm〜（Δ2），而CEMCC表现出最低的I _（COR）值为0.24μAcm〜（Δ2），大约两个数量级低于基板的数量级。此外，从硫酸硫酸铜滴测试和电化学阻抗谱（EIS）表征中获得的结果表明，与CECC相比，CEMCC具有更高的耐腐蚀性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号