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Synthesis and evaluation of a novel fluorinated poly(hexafluoroisopropyl methacrylate) polymer coating for corrosion protection on aluminum alloy
Surface & Coatings Technology ( IF 5.3 ) Pub Date : 2020-09-23 , DOI: 10.1016/j.surfcoat.2020.126444
Waleed K. Yaseen , Sreekar B. Marpu , Teresa D. Golden , Mohammad A. Omary

The hydrophobic and corrosion resistive film of cross-linked poly(hexafluoroisopropyl methacrylate) was successfully prepared by a simple photopolymerization method. The starting materials were a monomer of 1,1,1,3,3,3-hexafluoroisopropyl methacrylate, a photoinitiator of hydroxycyclohexyl phenyl ketone, and a cross-linker of poly (ethyleneglycol diacrylate). A very simple coating technique of drop-casting was used to deposit the fluorinated polymer onto an aluminum alloy substrate (AA 3003). The polymer coating was stable over a 60-day period when exposed to an aqueous solution of 3.5% NaCl as measured by open circuit potential technique. The fluorinated polymer coating had high corrosion protection when measured by potentiodynamic polarization with a reduction of 90% in the corrosion current density for the polymer-coated aluminum alloy over the bare substrate. The corrosion current density decreased to 0.065 μA/cm2 for the aluminum alloy coated with the polymer film compared to 0.708 μA/cm2 for uncoated aluminum alloy. Fourier-transform infrared spectroscopy was used to monitor the polymerization process. The dynamic contact angle technique was used to measure the hydrophobicity for the fluorinated polymer coating and increased from 65° to 100° for the uncoated and coated substrate, respectively. Contact angle measurements before and after treatment with strong acid were carried out to confirm the chemical resistance of the polymer coating. The thermal stability of the fluorinated polymer was measured using thermogravimetric analysis showing thermal stability up to 200 °C.



中文翻译:

新型氟化聚甲基丙烯酸六氟异丙酯聚合物涂层的合成与评价

通过简单的光聚合方法成功地制备了交联的聚(甲基丙烯酸六氟异丙基酯)的疏水性和耐腐蚀膜。起始材料是甲基丙烯酸1,1,1,3,3,3-六氟异丙基酯的单体,羟基环己基苯基酮的光引发剂和聚乙二醇二丙烯酸酯的交联剂。使用非常简单的滴铸涂覆技术将氟化聚合物沉积到铝合金基材(AA 3003)上。当通过开路电势技术测量时,当暴露于3.5%NaCl的水溶液中时,聚合物涂层在60天的时间内是稳定的。当通过电位动力极化法测量时,该氟化聚合物涂层具有高的腐蚀防护性能,该聚合物涂层的铝合金在裸露的基材上的腐蚀电流密度降低了90%。腐蚀电流密度降至0.065μA/ cm涂覆有聚合物膜的铝合金为2,而未涂覆的铝合金为0.708μA/ cm 2。使用傅立叶变换红外光谱法监测聚合过程。动态接触角技术用于测量氟化聚合物涂层的疏水性,未涂覆和涂覆的基材分别从65°增加到100°。在用强酸处理之前和之后进行接触角测量,以确认聚合物涂层的耐化学性。氟化聚合物的热稳定性使用热重分析法测量,显示出高达200°C的热稳定性。

更新日期:2020-09-30
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