Abstract In a primer coating system used in aerospace applications to protect aluminum alloy substrate, praseodymium is added as corrosion inhibitors while CaSO4 is primarily added as filler materials. The interaction of Pr and CaSO4 is unknown. The goal of this study is to characterize any cooperative or synergistic inhibition between these two. Cooperative inhibition can be defined when one inhibitor enhances inhibiting effect of the other that already has inhibiting ability. Synergistic inhibition can be defined when one inhibitor activates the inhibiting effect of the other that originally does not inhibit. Optical profilometry, electrochemical techniques and X-ray photoelectron spectroscopy were used to characterize corrosion results. The results showed that several pit parameters will affirm the inhibition effect. Electrochemical results cannot always detect modest corrosion inhibitors. Cooperative inhibition was detected in pH 5 while synergistic inhibition was observed in pH 8. Synergistic inhibition occurs because SO4 2− helps with gelation of Pr to passivate the surface.

中文翻译：

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镨和 CaSO4 协同协同缓蚀 AA 7075-T6

摘要 在航空航天应用保护铝合金基材的底漆涂层系统中，镨作为缓蚀剂添加，而CaSO4主要作为填充材料添加。Pr 和 CaSO4 的相互作用是未知的。本研究的目标是表征这两者之间的任何合作或协同抑制。当一种抑制剂增强另一种已经具有抑制能力的抑制作用时，可以定义协同抑制。当一种抑制剂激活另一种原本不抑制的抑制作用时，可以定义协同抑制。使用光学轮廓测定法、电化学技术和 X 射线光电子能谱来表征腐蚀结果。结果表明，几个坑参数将肯定抑制效果。电化学结果并不总能检测到适度的缓蚀剂。在 pH 5 中检测到协同抑制，而在 pH 8 中观察到协同抑制。发生协同抑制是因为 SO4 2- 有助于 Pr 凝胶化以钝化表面。