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Active corrosion performance of magnesium by silane coatings reinforced with polyaniline/praseodymium
Progress in Organic Coatings ( IF 6.5 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.porgcoat.2019.105504
Amir Samadi Najibzad , Reza Amini , Mehran Rostami , Pooneh Kardar , Michele Fedel

Abstract In recent years, many researches are conducted to find a good replacement for conversion coatings due to envirenmental issues. Silane-based coatings containing corrosion inhibitors can be good candidates. In this study, a composite containing praseodymium (Pr) and polyaniline (PANI) with different ratios was synthesized and prepared. SEM and FE-SEM images along with EDS and MAP were prepared to investigate the synthesis and confirmation of formation of PANI and Pr structure. Different concentrations of inhibitors were used and dispersed in the silane hybrid matrix and deposited it by dipping in an AZ31 magnesium alloy. The results of the identification and analysis indicate the formation of composite of these two organic-inorganic inhibitors and the replacement of praseodymium particles in the aniline structure. Subsequently, anti-corrosion properties of this composite in a 3.5 % solution were evaluated. Adding Pr-PANI to the silane coating resulted in an increase in contact angle. This increase in the contact angle of the sample with ratio of 2000 ppm was more than that in the sample with the ratio of 1000 ppm, indicating the presence of more OH groups in the coating. These results confirm the output of FT-IR and TGA data. In addition, the magnesium sample coated with silane was completely degraded after 24 h and the corrosion products are observed on the sample, but the coating of silane samples with Pr-PANI was less damaged after 24 h and also the sample with concentration of 2000 ppm of this inhibitor showed better performance than other concentrations.

中文翻译:

聚苯胺/镨增强硅烷涂层对镁的活性腐蚀性能

摘要 近年来,由于环境问题,进行了许多研究以寻找转化涂层的良好替代品。含有缓蚀剂的硅烷基涂料可能是不错的选择。在这项研究中,合成并制备了含有不同比例的镨 (Pr) 和聚苯胺 (PANI) 的复合材料。准备 SEM 和 FE-SEM 图像以及 EDS 和 MAP 以研究合成和确认 PANI 和 Pr 结构的形成。使用不同浓度的抑制剂并将其分散在硅烷杂化基体中,然后通过浸入 AZ31 镁合金进行沉积。鉴定和分析结果表明,形成了这两种有机无机抑制剂的复合物,并取代了苯胺结构中的镨颗粒。随后,评估了该复合材料在 3.5% 溶液中的抗腐蚀性能。在硅烷涂层中加入 Pr-PANI 导致接触角增加。比例为 2000 ppm 的样品接触角的增加大于比例为 1000 ppm 的样品,表明涂层中存在更多的 OH 基团。这些结果证实了 FT-IR 和 TGA 数据的输出。此外,硅烷包覆的镁样品在 24 h 后完全降解,在样品上观察到腐蚀产物,但 Pr-PANI 的硅烷涂层在 24 h 后受到的破坏较小,浓度为 2000 ppm 的样品也是如此。这种抑制剂表现出比其他浓度更好的性能。在硅烷涂层中加入 Pr-PANI 导致接触角增加。比例为 2000 ppm 的样品接触角的增加大于比例为 1000 ppm 的样品,表明涂层中存在更多的 OH 基团。这些结果证实了 FT-IR 和 TGA 数据的输出。此外,硅烷包覆的镁样品在 24 h 后完全降解,在样品上观察到腐蚀产物,但 Pr-PANI 的硅烷涂层在 24 h 后受到的破坏较小,浓度为 2000 ppm 的样品也是如此。这种抑制剂表现出比其他浓度更好的性能。在硅烷涂层中加入 Pr-PANI 导致接触角增加。比例为 2000 ppm 的样品接触角的增加大于比例为 1000 ppm 的样品,表明涂层中存在更多的 OH 基团。这些结果证实了 FT-IR 和 TGA 数据的输出。此外,硅烷包覆的镁样品在 24 h 后完全降解,在样品上观察到腐蚀产物,但 Pr-PANI 的硅烷涂层在 24 h 后受到的破坏较小,浓度为 2000 ppm 的样品也是如此。这种抑制剂表现出比其他浓度更好的性能。表明涂层中存在更多的 OH 基团。这些结果证实了 FT-IR 和 TGA 数据的输出。此外,硅烷包覆的镁样品在 24 h 后完全降解,并在样品上观察到腐蚀产物,但 Pr-PANI 的硅烷涂层在 24 h 后受到的破坏较小,浓度为 2000 ppm 的样品也是如此。这种抑制剂表现出比其他浓度更好的性能。表明涂层中存在更多的 OH 基团。这些结果证实了 FT-IR 和 TGA 数据的输出。此外,硅烷包覆的镁样品在 24 h 后完全降解,在样品上观察到腐蚀产物,但 Pr-PANI 的硅烷涂层在 24 h 后受到的破坏较小,浓度为 2000 ppm 的样品也是如此。这种抑制剂表现出比其他浓度更好的性能。
更新日期:2020-03-01
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