تطور السيليكا طلاءات الجسيمات النانوية البوليستر على السطوح المعرضة لأشعة الشمس
Summary
نوعين من الأسطح والصلب المغلفة البوليستر والبوليستر المغلفة بطبقة من جزيئات النانو السيليكا، وتمت دراسة. تعرضت كل السطوح لأشعة الشمس، والتي وجدت لتسبب تغيرات كبيرة في الكيمياء والنانو تضاريس السطح.
Abstract
تآكل الأسطح المعدنية هو السائد في البيئة ويشكل مصدر قلق كبير في العديد من المجالات، بما في ذلك الجيش، والنقل، والطيران، والبناء والصناعات الغذائية، وغيرها. وقد استخدمت على نطاق واسع البوليستر والطلاء تحتوي على كل من البوليستر والجسيمات النانوية السيليكا (شافي 2 NPS) لحماية الطبقات التحتية الصلب من الصدأ. في هذه الدراسة، ونحن تستخدم الأشعة السينية الضوئية الطيفي، الموهن الانعكاس الكلي الأشعة تحت الحمراء الطيفي الجزئي، والقياسات زاوية الاتصال المياه، والتنميط البصرية ومجهر القوة الذرية لتوفير نظرة ثاقبة كيف التعرض لأشعة الشمس يمكن أن يسبب تغيرات في الجزئي وسلامة النانوية من الطلاء. تم الكشف عن أي تغيير كبير في السطح الصغيرة الطبوغرافيا باستخدام profilometry البصرية، ومع ذلك، تم الكشف عن التغييرات النانو ذات دلالة إحصائية على السطح باستخدام مجهر القوة الذرية. تحليل الضوئية الطيفي للأشعة السينية والموهن التفكير الكلي الصغرى الأشعة تحت الحمراءكشفت بيانات التحليل الطيفي أن تدهور المجموعات استر وقعت خلال التعرض للأشعة فوق البنفسجية لتشكيل سجع ·، -H 2 C ·، -O ·، -co · المتطرفين. خلال عملية التحلل، وأنتجت أيضا أول أكسيد الكربون وثاني أكسيد الكربون 2.
Introduction
Environmental corrosion of metals in the environment is both prevalent and costly1-3. A recent study conducted by the Australasian Corrosion Association (ACA) reported that corrosion of metals resulted in a yearly cost of $982 million, which was directly associated with the degradation of assets and infrastructure through metallic corrosion within the water industry4. From an international perspective, the World Corrosion Organization estimated that metallic corrosion was responsible for a direct cost of $3.3 trillion, over 3% of the world’s GDP5. The process of galvanizing as a corrosion preventative method has been widely used to increase the lifespan of steel material6. In humid and subtropical climates, however, water tends to condense into small pockets or grooves within the surface of the galvanized steel, leading to the acceleration of corrosion rates through pit corrosion7,8. Thermosetting polymer coatings based on polyesters have been developed to coat the galvanized steel substrata increasing their ability to withstand humid weathering conditions for items such as satellite dishes, garden furniture, air-conditioning units or agricultural construction equipment9-11. Unfortunately polymer coatings on steel surfaces have been found to be considerably adversely affected by the presence of high levels of ultraviolet (uv) radiation12-14. Coatings comprised of silica nanoparticles (SiO2) spread over a polymer layer have been widely used with a view to increasing their corrosion-, wear-, tear- and degradation-resistance15,16. The tendency of the protective polymeric coatings to form pores and cracks can be reduced by incorporating nanoparticles (NPs), which contribute to the passive obstruction of corrosion initiation17,18. Also, the mechanical stability of the protective polymeric layer can be improved by NPs inclusion. However, these coatings act as passive physical barriers and, in comparison to the galvanization approach, cannot inhibit corrosion propagation actively.
An in-depth understanding of the effect that high-levels of ultraviolet light exposure under humid conditions upon these metal coatings is yet to be obtained. In this paper, a wide range of surface analytical techniques, including X-ray photoelectron spectroscopy (XPS), attenuated total reflection infrared micro-spectroscopy (ATR IR), contact angle goniometry, optical profiling and atomic force microscopy (AFM) will be employed to examine the changes in the surface of steel coatings prepared from polyester- and silica nanoparticle-coated polyester (silica nanoparticles/polyester) after exposure to sunlight. Furthermore, the aim of this work is to give a concise, practical overview of the overall characterization techniques to examine weathered samples.
Protocol
Representative Results
Discussion
وقد استخدمت الطلاء البوليستر على نطاق واسع لحماية الطبقات التحتية الصلب من التآكل التي يمكن أن تحدث على سطح غير المصقول بسبب تراكم الرطوبة والملوثات. التكسية البوليستر يمكن أن تحمي الحديد من التآكل؛ لكن فعالية على المدى الطويل من هذه الطلاءات للخطر إذا تعرضوا لمستو…
Disclosures
The authors have nothing to disclose.
Acknowledgements
Funding from the Australian Research Council Industrial Transformation Research Hubs Scheme (Project Number IH130100017) is gratefully acknowledged. Authors gratefully acknowledge the RMIT Microscopy and Microanalysis Facility (RMMF) for providing access to the characterisation instruments. This research was also undertaken on the Infrared Microscopectroscopy beamline at the Australian Synchrotron, Victoria, Australia.
Materials
| polyester-coated steel silica nanoparticle-polyester coated steel substrata |
BlueScope Steel | Samples provided by company | |
| Millipore PetriSlideTM | Fisher Scientific | PDMA04700 | Storing samples |
| Thermo ScientificTM K-alpha X-ray Photoelectron Spectrometer |
Thermo Fisher Scientific, Inc. | IQLAADGAAFFACVMAHV | Acquire XPS spectra |
| Avantage Data System | Thermo Fisher Scientific, Inc. | IQLAADGACKFAKRMAVI | Analyse XPS spectra |
| A Bruker Hyperion 2000 microscope | Bruker Corporation | Synchrotron integrated instrument | |
| Bruker Opus v. 7.2 | Bruker Corporation | ATR-IR analysis software | |
| Contact angle goniometer, FTA1000c | First Ten Ångstroms Inc., VA, USA | Measuring the wettability of surfaces | |
| FTA v. 2.0 | First Ten Ångstroms Inc., VA, USA | Anaylyzing water contact angle | |
| Optical profiler, Wyko NT1100 | Bruker Corporation | Measure surface topography | |
| Innova atomic force microscope | Bruker Corporation | Measure surface topography | |
| Phosphorus doped silicon probes, MPP-31120-10 | Bruker Corporation | AFM probes | |
| Gwyddion software | http://gwyddion.net/ | Software used to measure optical profiling and AFM data |
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