Summary

日光への露出表面上にシリカナノ粒子 - ポリエステルコーティングの進化

Published: October 11, 2016
doi:

Summary

表面の2種類のシリカナノ粒子の層でコーティングされたポリエステル被覆鋼およびポリエステルを、調べました。両表面は、表面の化学的性質およびナノトポグラフィーでの実質的な変化を引き起こすことが見出された日光に暴露しました。

Abstract

金属表面の腐食は、環境中で流行していると、とりわけ軍事、輸送、航空、建物や食品産業など、多くの分野での大きな関心事です。ポリエステル及びシリカナノ粒子(SiO 2のNPS)の両方を含有するポリエステル及びコーティングは広く腐食から鋼基層を保護するために使用されてきました。本研究では、X線光電子分光法、減衰全反射赤外線マイクロ分光法、水接触角測定、光学プロファイリングおよび原子間力顕微鏡は、日光への曝露は、マイクロおよびナノスケールの完全性の変化を引き起こすことができる方法への洞察を提供するために利用しましたコーティングの。表面マイクロトポグラフィーの有意な変化は、光学プロフィロメトリーを用いて検出されなかったが、表面に統計学的に有意なナノスケールの変化は、原子間力顕微鏡を用いて検出しました。 X線光電子分光法の分析と減衰全反射赤外線マイクロ分光分析データは、エステル基の分解はCOO・、H 2 C・、-O・、-CO・ラジカルを形成するために紫外線に暴露により生じたことを明らかにしました。分解プロセスの間に、CO及びCO 2も作製しました。

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

1.鋼試料商業的供給業者から厚さ1mmの鋼試料を得ます。 注:サンプルは、シリカナノ粒子でコーティングされたポリエステルまたはポリエステルのいずれかでコーティングしました。 ロックハンプトン、クイーンズランド州、オーストラリアでの太陽光にサンプルを公開:合計5年間で1年と5年の間隔後のサンプルを収集します。穴パンチャーを使用して?…

Representative Results

一方又は5年間、日光への曝露に供された被覆された鋼試料を採取し、水接触角測定は、露光面の表面疎水性の変化が生じたかどうかを決定するために実施した( 図2 )。 日光への暴露の5年間ポリエステルまたはシリカのナノ粒子/ポリエステルコーティングを有する表面?…

Discussion

ポリエステルコーティングが広く水分及び汚染物質の蓄積にコーティングされていない表面に生じる腐食から鋼基層を保護するために使用されてきました。ポリエステルコーティングの適用は、腐食から鋼を保護することができます。それらは多湿条件下で紫外線の高レベルにさらされた場合、熱帯気候で発生しかしながらこれらのコーティングの長期の有効性が、損なわれる。シリカナノ?…

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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Cite This Article
Truong, V. K., Stefanovic, M., Maclaughlin, S., Tobin, M., Vongsvivut, J., Al Kobaisi, M., Crawford, R. J., Ivanova, E. P. The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight. J. Vis. Exp. (116), e54309, doi:10.3791/54309 (2016).

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