scholarly journals Thermal behaviour and corrosion resistance of nano-ZnO/polyurethane film

2018 ◽  
Vol 985 ◽  
pp. 012032 ◽  
Author(s):  
E Virgawati ◽  
B Soegijono
Keyword(s):  
Corrosion Resistance ◽  
Thermal Behaviour ◽  
Nano Zno ◽  
Polyurethane Film

Effect of nano ZnO containing sol-gel coating on galvanised iron sheet

2015 ◽  
Vol 44 (4) ◽  
pp. 239-249 ◽  
Author(s):  
Akshya Kumar Guin ◽  
Manish Bhadu ◽  
Mohua Sinhababu ◽  
Tapan Kumar Rout ◽  
G. Udayabhanu
Keyword(s):  
Corrosion Resistance ◽  
Water Permeability ◽  
Steel Sheet ◽  
Salt Spray ◽  
Sol Gel ◽  
Nano Zno ◽  
Content Type ◽  
Galvanised Steel ◽  
Passivation Treatment ◽  
Hexavalent Chrome

Purpose – This paper aims to investigate the potential of sol-gel coating as replacement for hazardous hexavalent chrome passivation treatment for galvanised iron (GI) sheet. Generally, corrosion resistance properties of the GI sheet are increased by hexavalent chrome passivation treatment. But hexavalent chrome is hazardous and not environment friendly. Design/methodology/approach – The aim of this study was to understand the effect of nano zinc oxide (ZnO) on corrosion behaviour of sol-gel coating prepared by hydrolysis of the 3-(Glycidoxy propyl) methyl diethoxy silane (GPTMS) and tetra-ethyl-orthosilicate (TEOS). The morphology of the film was characterised by a scanning electron microscope (SEM). The corrosion resistance of the coated samples was evaluated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarisation curve and salt spray test. Findings – From a different corrosion resistance study, it has been observed that sol-gel coating doped with 1 per cent nano ZnO rendered maximum corrosion protection. Beyond 1 per cent of nano ZnO, corrosion resistance property of coated galvanised steel sheet decreased drastically which may be due to agglomeration of nano ZnO and high water permeability of coated galvanised steel sheet. Research limitations/implications – The anti-corrosive property of the coating can be tested by means of atmospheric exposure which produces a real-time evaluation of the anti-corrosive nature of the coating under natural conditions rather than using an accelerated laboratory test. Practical implications – It may be useful for other metal industry like aluminium. The work can be used as a guiding chemistry for development of chrome-free passivation for aluminium. Social implications – It has the potential to replace hexavalent chrome passivation. Originality/value – The use of nano ZnO in sol-gel polymer matrix for the development of corrosion resistant chrome-free polymer coating for galvanised steel sheet and its corrosion resistance study (EIS curve fitting, capacitance value and water permeability) is a novel approach in this research.

scholarly journals NanoZnO-modified titanium implants for enhanced anti-bacterial activity, osteogenesis and corrosion resistance

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Zheng Wang ◽  
Xiaojing Wang ◽  
Yingruo Wang ◽  
Yanli Zhu ◽  
Xinqiang Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Elements ◽  
Antibacterial Properties ◽  
Titanium Implants ◽  
Research Progress ◽  
Corrosion Properties ◽  
Nano Zno ◽  
Preparation Methods ◽  
Practical Applications ◽  
Low Cytotoxicity

AbstractTitanium (Ti) implants are widely used in dentistry and orthopedics owing to their excellent corrosion resistance, biocompatibility, and mechanical properties, which have gained increasing attention from the viewpoints of fundamental research and practical applications. Also, numerous studies have been carried out to fine-tune the micro/nanostructures of Ti and/or incorporate chemical elements to improve overall implant performance. Zinc oxide nanoparticles (nano-ZnO) are well-known for their good antibacterial properties and low cytotoxicity along with their ability to synergize with a variety of substances, which have received increasingly widespread attention as biomodification materials for implants. In this review, we summarize recent research progress on nano-ZnO modified Ti-implants. Their preparation methods of nano-ZnO modified Ti-implants are introduced, followed by a further presentation of the antibacterial, osteogenic, and anti-corrosion properties of these implants. Finally, challenges and future opportunities for nano-ZnO modified Ti-implants are proposed. Graphical Abstract

scholarly journals The Research of Interface Microdomain and Corona-Resistance Characteristics of Micro-Nano-ZnO/LDPE

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 563
Author(s):  
Yujia Cheng ◽  
Guang Yu
Keyword(s):  
Corrosion Resistance ◽  
Energy Transfer ◽  
Polymer Composites ◽  
Mass Fraction ◽  
Crystalline Morphology ◽  
Nano Zno ◽  
Inorganic Particles ◽  
Zno Particles ◽  
Resistance Breakdown ◽  
Corona Resistance

In this article, the melting blend was used to prepare the Micro-ZnO/LDPE, Nano-ZnO/LDPE and Micro-Nano-ZnO/LDPE with different inorganic particles contents. The effect of Micro-ZnO and Nano-ZnO particles doping on interface microdomain and corona-resistance breakdown characteristics of LDPE composite could be explored. Based on the energy transfer and heat exchange theory of energetic electrons, the inner electrons energy transfer model of different ZnO/LDPE composites was built. Besides, the microstructure and crystalline morphology of inorganic ZnO-particles and polymer composites were detected by SEM, XRD, FTIR, PLM and DSC test, and the AC breakdown and corona-resistance breakdown characteristics of composites could be explored. From the experimental results, the Nano-ZnO particles after surface modification dispersed uniformly in LDPE matrix, and the nanoparticles agglomeration almost disappeared. The inorganic particles doping acted as the heterogeneous nucleation agent, which improved the crystallization rate and crystallinity of polymer composites effectively. The ZnO particles with different size doping constituted the different interface structure and crystalline morphology, which made different influence on composites macroscopic properties. When the Nano-ZnO particle size was 40nm and the mass fraction was 3%, the breakdown field strength of Nano-ZnO/LPDE was the highest and 15.8% higher than which of pure LDPE. At the same time, the shape parameter β of Micro-Nano-composite was the largest. It illustrated the microparticles doping reduced the probability of nanoparticles agglomeration in matrix. Besides, both Micro-ZnO and Micro-Nano-ZnO particles doping could improve the ability of corona corrosion resistance of LDPE in varying degrees. The corona-resistant breakdown time order of four samples was as follows: LDPE < Micro-ZnO/LDPE < Nano-ZnO/LDPE < Micro-Nano-ZnO/LDPE. When the mass fraction of Micro-ZnO and Nano-ZnO particles was 2% and 3% respectively, the corrosion depth and area of Micro-Nano-ZnO/LDPE was the least, and the ability of corona corrosion resistance was the strongest.

Theoretical and experimental investigation on enhanced thermal behaviour in chunk-shaped nano ZnO

2013 ◽  
Vol 112 (1) ◽  
pp. 142-150 ◽  
Author(s):  
N. Rajamanickam ◽  
S. Rajashabala ◽  
K. Ramachandran
Keyword(s):  
Experimental Investigation ◽  
Thermal Behaviour ◽  
Nano Zno

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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