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Study on Wettability and Corrosion Behavior of Al 2 O 3 Doped Polyurea Coatings
Protection of Metals and Physical Chemistry of Surfaces ( IF 1.1 ) Pub Date : 2020-11-17 , DOI: 10.1134/s2070205120050275
Jiaao Yan , Zhiming Gao , Qingchao Tan , Xian Yang , Wenbin Hu

Abstract

The Al2O3 powder was added as a filler to polyurea and the effect of doping amount on Shore hardness and wetting property were investigated. The electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion resistance of coating/aluminum alloy system in 0.1 mol/L NaOH solution. The results showed that with the increase of the doping amount, the Shore hardness of the coating increased and the contact angle on the aluminum alloy matrix decreased. By analyzing the results of the characteristics of EIS and the fitting results, doped Al2O3 powder can improve the coating corrosion resistance, but it may affect the density of the coating and reduce the impedance modulus during the initial stage of immersion. The relationship between the doping amount of Al2O3 powder and the corrosion resistance in this test was 5 wt % > 10 wt % > 15 wt % > 0 wt %. In general, in the doping range of this test, since the powder was uniformly distributed in the polyurea coating, the cohesive force of the polyurea can be lowered to cause an increase in the wetting property. At the same time, excessive dopped Al2O3 powder may deteriorate the compactness of the polyurea and the binding property of the polyurea itself may decrease, resulting in deterioration of corrosion resistance. However, the proper doping of Al2O3 powder in polyurea improves its overall performance.



中文翻译:

Al 2 O 3掺杂聚脲涂层的润湿性和腐蚀行为研究

摘要

将Al 2 O 3粉末作为填料添加到聚脲中,研究了掺杂量对肖氏硬度和润湿性的影响。电化学阻抗谱(EIS)用于研究涂层/铝合金体系在0.1 mol / L NaOH溶液中的耐腐蚀性。结果表明,随着掺杂量的增加,涂层的肖氏硬度增加,铝合金基体的接触角减小。通过分析EIS的特征结果和拟合结果,得出掺杂Al 2 O 3粉末可以提高涂层的耐腐蚀性,但是在浸入初期,它可能会影响涂层的密度并降低阻抗模量。在该试验中,Al 2 O 3粉末的掺杂量与耐腐蚀性之间的关系为5重量%> 10重量%> 15重量%> 0重量%。通常,在该试验的掺杂范围内,由于粉末均匀地分布在聚脲涂层中,因此可以降低聚脲的内聚力,从而提高润湿性。同时,过量掺杂的Al 2 O 3粉末可能会降低聚脲的密实性,并且聚脲本身的粘合性能可能会下降,从而导致耐腐蚀性下降。然而,在聚脲中适当地掺杂Al 2 O 3粉末可改善其整体性能。

更新日期:2020-11-17
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