Ammar Ameen Uddin, Shahid Muhammad, Ahmed Muhammad Khitab, Khan Munawar, Khalid Amir, Khan Zulfiqar Ahmad
School of Chemical & Materials Engineering, National University of Sciences & Technology, Islamabad 46000, Pakistan.
Bournemouth University, NanoCorr, Energy & Modelling (NCEM) Research Group, Poole House P123, Talbot Campus, Fern Barrow, Poole BH12 5BB, UK.
Materials (Basel). 2018 Feb 25;11(3):332. doi: 10.3390/ma11030332.
Coating is one of the most effective measures to protect metallic materials from corrosion. Various types of coatings such as metallic, ceramic and polymer coatings have been investigated in a quest to find durable coatings to resist electrochemical decay of metals in industrial applications. Many polymeric composite coatings have proved to be resistant against aggressive environments. Two major applications of ferrous materials are in marine environments and in the oil and gas industry. Knowing the corroding behavior of ferrous-based materials during exposure to these aggressive applications, an effort has been made to protect the material by using polymeric and ceramic-based coatings reinforced with nano materials. Uncoated and coated cast iron pipeline material was investigated during corrosion resistance by employing EIS (electrochemical impedance spectroscopy) and electrochemical DC corrosion testing using the "three electrode system". Cast iron pipeline samples were coated with Polyvinyl Alcohol/Polyaniline/FLG (Few Layers Graphene) and TiO₂/GO (graphene oxide) nanocomposite by dip-coating. The EIS data indicated better capacitance and higher impedance values for coated samples compared with the bare metal, depicting enhanced corrosion resistance against seawater and "produce water" of a crude oil sample from a local oil rig; Tafel scans confirmed a significant decrease in corrosion rate of coated samples.
涂层是保护金属材料免受腐蚀的最有效措施之一。为了在工业应用中找到耐用的涂层来抵抗金属的电化学腐蚀，人们对各种类型的涂层进行了研究，如金属涂层、陶瓷涂层和聚合物涂层。许多聚合物复合涂层已被证明能够抵抗侵蚀性环境。黑色金属材料的两个主要应用领域是海洋环境和石油与天然气工业。鉴于了解黑色金属基材料在这些侵蚀性应用中的腐蚀行为，人们已努力通过使用用纳米材料增强的聚合物和陶瓷基涂层来保护材料。通过采用电化学阻抗谱（EIS）和使用“三电极系统”的电化学直流腐蚀测试，对未涂层和涂层铸铁管道材料的耐腐蚀性进行了研究。通过浸涂法，用聚乙烯醇/聚苯胺/少层石墨烯（FLG）和二氧化钛/氧化石墨烯（GO）纳米复合材料对铸铁管道样品进行了涂层处理。EIS数据表明，与裸金属相比，涂层样品具有更好的电容和更高的阻抗值，这表明其对海水和来自当地石油钻井平台的原油样品的“产出水”具有更强的耐腐蚀性；塔菲尔扫描证实涂层样品的腐蚀速率显著降低。
