Abstract A thin stand-alone waterborne coating that combines hydrophobicity and a built-in ability to in-situ phosphatize low carbon steel substrates, avoiding flash rust in the interface is presented. Despite the hydrophobicity of the coating is enhanced by the presence of a fluorinated comonomer, the barrier protection is substantially decreased as compared with a pure acrylate coating. The bad performance is independent of the thickness and it is mostly attributed to the lack of coalescence of the copolymer particles containing fluorinated comonomer (detected by Scanning Electron Microscopy (SEM)). The best way to hinder this harmful effect is to trigger the formation of the in-situ phosphatization layer on the metallic surface; namely slowly drying the coating at 60 % of relative humidity (R.H.). The combination of Electrochemical Impedance Spectroscopy (EIS) and Scanning Kelvin Probe (SKP) has shown the beneficial effect of having a protected interface when it is exposed either to bulk electrolyte or to a droplet of 3.5 wt.% NaCl. A methodology using both techniques to evaluate coatings with an artificial defect has proved that the phosphatization is governing the corrosion protection for these coatings.

中文翻译：

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SKP 和 EIS 评估原位磷化对涂有氟化水性粘合剂的钢的耐腐蚀性的影响

摘要 提出了一种薄的独立水性涂料，它结合了疏水性和内建的低碳钢基材原位磷化能力，避免了界面闪锈。尽管氟化共聚单体的存在增强了涂层的疏水性，但与纯丙烯酸酯涂层相比，屏障保护显着降低。性能不佳与厚度无关，主要归因于含有氟化共聚单体的共聚物颗粒缺乏聚结（通过扫描电子显微镜（SEM）检测）。阻止这种有害影响的最好方法是触发金属表面原位磷化层的形成；即在 60% 的相对湿度 (RH) 下缓慢干燥涂层。电化学阻抗谱 (EIS) 和扫描开尔文探针 (SKP) 的组合显示出在接触大量电解质或 3.5 wt.% NaCl 液滴时具有受保护界面的有益效果。使用这两种技术来评估具有人工缺陷的涂层的方法已经证明，磷化控制着这些涂层的腐蚀保护。