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Atomic Layer Deposited TiO2 and Al2O3 Thin Films as Coatings for Aluminum Food Packaging Application

机译:原子层沉积的TiO2和Al2O3薄膜作为铝食品包装用涂料

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摘要

Titanium dioxide (TiO2) and aluminum oxide (Al2O3) coatings have been investigated in a wide range of bio-applications due to their biodegradation and biocompatibility properties, that are key parameters for their use in the food packaging and biomedical devices fields. The present study evaluates and compares the electrochemical behavior of the non-coated, commercial resin-coated, TiO2-coated and Al2O3-coated aluminum in commercial beer electrolyte. For this, TiO2 and Al2O3 thin films were deposited on aluminum (Al) substrates using atomic layer deposition (ALD). The evaluation of the corrosion barrier layer properties was performed by linear sweep voltammetry (LSV) during 10 min and electrochemical impedance spectroscopy (EIS). In addition, profilometry, grazing incidence X-ray diffractometry (GIXRD), scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR) analyses were performed to investigate the physical and chemical properties of the pristine and / or corroded samples. TiO2 and Al2O3 films presented an amorphous structure, a morphology that follows Al substrate surface, and a thickness of around 100 nm. Analysis of LSV data showed that ALD coatings promoted a considerable increase in corrosion barrier efficiency being 86.3% for TiO2-coated Al and 80% for Al2O3-coated Al in comparison with 7.1% of commercial resin-coated Al. This is mainly due to the lower electrochemical porosity, 11.4% for TiO2-coated Al and 20.4% for Al2O3-coated Al in comparison with 96% of the resin-coated Al, i.e. an increase of up to twofold in the protection of Al when coated with TiO2 compared to Al2O3. The EIS results allow us to complement the discussions about the reduced corrosion barrier efficiency of the Al2O3 film for beer electrolyte once SEM and FT-IR analyzes did not show drastic changes in both investigated ALD films after the corrosion assays. The above results indicate that ALD TiO2 and Al2O3 films may be a viable alternative to replace the synthetic resin coatings frequently used in aluminum cans of use in the food industry.
机译:由于二氧化钛(TiO2)和氧化铝(Al2O3)的生物降解性和生物相容性,是在食品包装和生物医学设备领域中使用的关键参数,因此已在广泛的生物应用中进行了研究。本研究评估并比较了啤酒啤酒电解液中未涂覆,商用树脂涂覆,TiO2涂覆和Al2O3涂覆的铝的电化学行为。为此,使用原子层沉积(ALD)将TiO2和Al2O3薄膜沉积在铝(Al)基板上。腐蚀阻隔层性能的评估是通过线性扫描伏安法(LSV)在10分钟内和电化学阻抗谱(EIS)进行的。此外,进行了轮廓测定,掠入射X射线衍射(GIXRD),扫描电子显微镜(SEM)和傅里叶变换红外光谱(FT-IR)分析,以研究原始和/或腐蚀样品的物理和化学性质。 。 TiO2和Al2O3薄膜呈现出非晶态结构,其形貌遵循Al基体表面,厚度约为100 nm。对LSV数据的分析表明,与7.1%的市售树脂涂层Al相比,ALD涂层促进了TiO2涂层Al的86.3%和Al2O3涂层Al的80%的耐腐蚀效率的显着提高。这主要是由于较低的电化学孔隙率,TiO2涂层的Al的11.4%和Al 2 O 3 涂层的Al的20.4%,而树脂的比例为96%涂层的Al,即与TiO 2 O 3 相比,涂TiO 2 时对Al的保护作用提高了两倍。 EIS结果使我们可以补充有关SEM和FT-IR分析没有显示出剧烈变化的啤酒电解液中Al 2 O 3 膜降低的腐蚀阻挡层效率的讨论。腐蚀试验后,两种被研究的ALD膜的变化。以上结果表明,ALD TiO 2 和Al 2 O 3 膜可能是替代铝中常用的合成树脂涂层的可行选择。食品工业中使用的罐头。

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