Metal's corrosion is an important parameter affecting the steel lifetime. Nowadays, because of the widespread industrial applications of mild steel, the corrosion protection of this material has become a challenging item. The modification of the metal surface (i.e., mild steel, MS) via thin hydrophobic layers is one of the most efficient/promising protocols for the improvement of the metal's anti-corrosion properties.

In this work, the MS sample surface was treated by a novel thin-film based on the europium (Eu) oxide. Using stearic acid (STA) and palmitic acid (PAA) molecules, a hydrophobic layer was constructed on the Eu-treated sample. The EDS and GIXRD tests were utilized for the analysis of the elemental/phase compositions of the treated and untreated samples. The FE-SEM and AFM tests were used for studying the surface morphology and topography of the treated and untreated samples. The corrosion protection durability of the coated metals was checked via electrochemical approaches, i.e., EIS and potentiodynamic polarization. The EDS/Mapping analysis demonstrated that the europium conversion coating (EuCC) was successfully deposited on the MS surface. Besides, a high concentration of the Eu-containing compounds in the GIXRD patterns proved the sufficient Eu-based conversion coating formation on the sample. The contact angle (CA) measurements displayed that after surface modification with the hydrophobic layer, the CA was drastically improved by about 40%. The FE-SEM micrographs ensured the precipitation of a uniform protective layer without obvious cracks on the MS surface. The Tafel curves illustrated that the EuCC-STA could diminish the steel corrosion by mixed anodic and cathodic inhibition mechanisms. The EIS reports evidence that the existence of the EuCC-STA hydrophobic film could diminish about 66% of corrosion activities during 24 h of iron exposure to the harsh 3.5% chloride media.

金属的腐蚀是影响钢寿命的重要参数。如今，由于低碳钢的广泛工业应用，这种材料的腐蚀防护已成为一项具有挑战性的项目。通过疏水薄层对金属表面（即，低碳钢，MS）进行改性是提高金属抗腐蚀性能的最有效/最有前景的方案之一。

在这项工作中，通过基于氧化（的新型薄膜处理了MS样品表面。使用硬脂酸（STA）和棕榈酸（PAA）分子，在Eu处理的样品上构建了疏水层。EDS和GIXRD测试用于分析处理和未处理样品的元素/相组成。FE-SEM和AFM测试用于研究已处理和未处理样品的表面形态和形貌。通过电化学方法，即EIS和电位动力学极化，检查了涂层金属的耐腐蚀耐久性。EDS /映射分析表明，the转化膜（EuCC）已成功沉积在MS表面上。除了，GIXRD图谱中高浓度的含Eu化合物证明样品上形成了足够的Eu基转化膜。接触角（CA）测量表明，在对疏水层进行表面改性后，CA显着提高了约40％。FE-SEM显微照片确保了均匀保护层的沉淀，而MS表面上没有明显的裂纹。Tafel曲线表明，EuCC-STA可以通过混合的阳极和阴极抑制机理来减少钢的腐蚀。EIS报告的证据表明，在铁暴露于苛刻的3.5％氯介质的24小时内，EuCC-STA疏水膜的存在会减少约66％的腐蚀活性。接触角（CA）测量表明，在对疏水层进行表面改性后，CA显着提高了约40％。FE-SEM显微照片确保了均匀保护层的沉淀，而MS表面上没有明显的裂纹。Tafel曲线表明，EuCC-STA可以通过混合的阳极和阴极抑制机理来减少钢的腐蚀。EIS报告的证据表明，在铁暴露于苛刻的3.5％氯介质的24小时内，EuCC-STA疏水膜的存在会减少约66％的腐蚀活性。接触角（CA）测量表明，在对疏水层进行表面改性后，CA显着提高了约40％。FE-SEM显微照片确保了均匀保护层的沉淀，而MS表面上没有明显的裂纹。Tafel曲线表明，EuCC-STA可以通过混合的阳极和阴极抑制机理来减少钢的腐蚀。EIS报告的证据表明，在铁暴露于苛刻的3.5％氯介质的24小时内，EuCC-STA疏水膜的存在会减少约66％的腐蚀活性。Tafel曲线表明，EuCC-STA可以通过混合的阳极和阴极抑制机理来减少钢的腐蚀。EIS报告的证据表明，在铁暴露于苛刻的3.5％氯介质的24小时内，EuCC-STA疏水膜的存在会减少约66％的腐蚀活性。Tafel曲线表明，EuCC-STA可以通过混合的阳极和阴极抑制机理来减少钢的腐蚀。EIS报告的证据表明，在铁暴露于苛刻的3.5％氯介质的24小时内，EuCC-STA疏水膜的存在会减少约66％的腐蚀活性。