ABSTRACT

In this study, nanocrystalline ZnO (NC ZnO) films are considered as interface layers for polymer/metal bonds consisting of hot-dip galvanised steel (HDG) and epoxy resin. NC ZnO films with a thickness of less than one micrometre were deposited on HDG through hydrothermal deposition from aqueous Zn nitrate/hexamethylenetetramine electrolytes. Furthermore, 3-aminopropylphosphonic acid (APPA) and 3-aminopropyltriethoxysilane (γ-APS) were considered for molecular adhesion-promoting layers. 90°-peel tests of water-saturated epoxy films confirm the improvement of bond strength under humid environments. Electrochemical properties of the thin film coatings analysed by current density potential curves indicate effective inhibition of oxygen reduction and metal alloy dissolution. Scanning Kelvin probe (SKP) measurements confirm that the corrosive delamination of the polymer from the metal substrate is significantly slowed down by the considered surface modifications. The combination of NC ZnO films with APPA as an adhesion promoting molecule showed the best performances.

摘要

在这项研究中，纳米晶 ZnO (NC ZnO) 薄膜被认为是由热浸镀锌钢 (HDG) 和环氧树脂组成的聚合物/金属键的界面层。通过水热法沉积硝酸锌/六亚甲基四胺水溶液，将厚度小于 1 微米的 NC ZnO 薄膜沉积在 HDG 上。此外，3-氨基丙基膦酸（APPA）和3-氨基丙基三乙氧基硅烷（γ-APS）被考虑用于分子粘附促进层。水饱和环氧薄膜的 90° 剥离试验证实了在潮湿环境下粘合强度的提高。通过电流密度电位曲线分析的薄膜涂层的电化学性能表明有效抑制了氧还原和金属合金溶解。扫描开尔文探针 (SKP) 测量证实，聚合物与金属基材的腐蚀性分层通过所考虑的表面改性显着减慢。NC ZnO 薄膜与 APPA 作为粘附促进分子的组合表现出最佳性能。