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Corrosion Resistance of Epoxy Coatings Modified by Bis-Silane Prepolymer on Aluminum Alloy

机译:双硅烷预聚物在铝合金上改性环氧涂层的耐腐蚀性

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In this communication, a bis-silane prepolymer was used to modify epoxy resin, aiming to enhance the corrosion resistance of epoxy coatings on aluminum alloy substrates. The bis-silane prepolymer was prepared by tetraethoxysilane (TEOS) and γ-glycidoxypropyl trimethoxysilane (GPTMS). The corrosion behavior of silane-epoxy coatings was studied. Compared with silane monomer-modified epoxy coatings, bis-silane-modified epoxy coatings have lower coating capacitance (Cc), higher charge transfer resistances (Rdl), and lower double layer capacitance (Cdl) during long-time immersion. It indicates that bis-silane-modified epoxy coating has stronger waterproof permeability and substrate corrosion protection ability. In addition, due to the leaching of the silane component and cross-linking reaction between different silanes during the immersion process, the bis-silane-modified epoxy coatings exhibit much stronger “self-healing” ability.
机译:在该通信中,使用双硅烷预聚物来改变环氧树脂,旨在增强环氧涂层对铝合金基材的耐腐蚀性。 通过四乙氧基硅烷(TEOS)和γ-缩水甘油氧基丙基三甲氧基硅烷(GPTM)制备双硅烷预聚物。 研究了硅烷 - 环氧涂层的腐蚀行为。 与硅烷单体改性的环氧树脂涂料相比,双硅烷改性的环氧树脂涂层具有较低的涂布电容(CC),在长时间浸没期间具有较低的电荷转移电阻(RDL)和较低的双层电容(CDL)。 它表明双硅烷改性的环氧涂层具有较强的防水渗透性和基材腐蚀保护能力。 另外,由于硅烷组分的浸出和在浸渍过程中不同硅烷之间的交联反应,双硅烷改性的环氧涂料具有更强烈的“自我愈合”能力。

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