This study introduces a novel environmentally friendly chemical conversion coating based on neodymium (Nd) oxide for mild steel surface treatment. The Nd-based nanofilm impact on the polyester/melamine coating adhesion to metal surface and corrosion protection properties was examined. The Nd film composition and morphology were analyzed by XPS, AFM, SEM, and contact angle measurements. The uniform deposition of Nd-oxide/hydroxide compounds on steel surface was proved by surface characteristic analyses. Pull-off adhesion test results evidenced the wet adhesion bonding strength improvement of coating on steel treated by Nd-oxides/hydroxide compounds. Furthermore, the coating delamination rate remarkably decreased in the presence of Nd film. The significant effect of Nd film on the anti-corrosion properties of steel/coating system was demonstrated by accelerated salt spray corrosion test and electrochemical impedance spectroscopy test results. Additionally, molecular dynamics simulation results clarified the stronger coating molecules adsorption to neodymium oxide substrates as compared with iron oxides.

这项研究介绍了一种基于氧化钕（Nd）的新型环保化学转化涂层，用于低碳钢表面处理。研究了基于Nd的纳米膜对聚酯/三聚氰胺涂层对金属表面的附着力和防腐性能的影响。通过XPS，AFM，SEM和接触角测量分析了Nd膜的组成和形貌。通过表面特性分析证明了Nd-氧化物/氢氧化物在钢表面的均匀沉积。剥离附着力测试结果证明了用Nd-氧化物/氢氧化物处理的钢上涂层的湿附着强度得到了提高。此外，在存在Nd膜的情况下，涂层的分层速率显着降低。加速盐雾腐蚀试验和电化学阻抗谱测试结果证明了Nd膜对钢/涂层系统防腐性能的显着影响。此外，分子动力学模拟结果表明，与氧化铁相比，涂层分子对氧化钕基材的吸附性更强。