Corrosion Resistant Coatings Based on Zinc Nanoparticles, Epoxy and Silicone Resins

In this study, corrosion-resistant composite coatings were produced by incorporating zinc (Zn) nanoparticles in an epoxy resin and a hybrid silicone resin. While performing sodium chloride saltspray tests, the corrosion performance of the nano-composite coatings was evaluated by applying these corrosion-resistant composite coatings on a carbon steel substrate. The nano-composite coatings on the substrates were characterized by an adhesion test, scanning electron microscope (SEM), and transmission electron microscope (TEM) with energy-dispersive X-ray spectroscopy (EDX). The results of the salt-spray tests showed that the Zn nanoparticles in the epoxy and hybrid silicone resins could react with permeated oxygen, thereby improving the anticorrosion properties of the Zn nano-composites. The corroded area of the epoxy resin samples decreased from more than 80% without Zn doping to less than 5% in a 3000-ppm Zn-doped sample after a 500-h saltspray test. An evaluation of the bactericidal properties showed that the Zn/epoxy and Zn/hybrid silicone resin nano-composites with at least 360 ppm of Zn nanoparticles exhibited bactericidal ability, which remarkably increased with the Zn nanoparticles content. The corrosion-resistant properties improved with the addition of Zn nano-composites coatings.

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Corrosion resistant metal-ceramic composite coatings for tribological applications

Journal of Tribology ◽

10.1115/1.4052867 ◽

2021 ◽

pp. 1-34

Author(s):

Peter Renner ◽

Swarn Jha ◽

Yan Chen ◽

Tariq Chagouri ◽

Serge Kazadi ◽

...

Keyword(s):

Ceramic Composite ◽

Low Cost ◽

Composite Coatings ◽

Salt Spray ◽

Extreme Environments ◽

Safe Procedure ◽

Corrosion Resistant ◽

Wide Range ◽

Metal Ceramic ◽

Corrosion Resistant Coatings

Abstract Effective design of corrosion-resistant coatings is critical for the protection of metals and alloys. Many state-of-the-art corrosion-resistant coatings are unable to satisfy the challenges in extreme environments for tribological applications, such as elevated or cryogenic temperatures, high mechanical loads and impacts, severe wear, chemical attack, or a combination of these. The nature of challenging conditions demands that coatings have high corrosion and wear resistance, sustained friction control, and maintain surface integrity. In this research, multi-performance metal-ceramic composite coatings were developed for applications in harsh environments. These coatings were developed with an easy to fabricate, low-cost, and safe procedure. The coating consisted of boron nitride, graphite, silicon carbide, and transition metals such as chromium or nickel using epoxy as vehicle and bonding agent. Salt spray corrosion tests showed that 1010 carbon steel (1/4 hard temper) substrates lost 20-100× more mass than the coatings. The potentiodynamic polarization study showed better performance of the coatings by seven orders of magnitude in terms of corrosion relative to the substrate. Additionally, the corrosion rates of the coatings with Ni as an additive were five orders of magnitude lower than reported. The coefficient of friction of coatings was as low as 0.1, five to six times lower than that of epoxy and lower than a wide range of epoxy resin-based coatings found in literature. Coatings developed here exhibited potential in applications in challenging environments for tribological applications.

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Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying

Coatings ◽

10.3390/coatings9080505 ◽

2019 ◽

Vol 9 (8) ◽

pp. 505

Author(s):

Xinqiang Lu ◽

Shouren Wang ◽

Tianying Xiong ◽

Daosheng Wen ◽

Gaoqi Wang ◽

...

Keyword(s):

Wear Resistance ◽

Composite Coatings ◽

Salt Spray ◽

Cold Spraying ◽

Neutral Salt ◽

Corrosion Resistant ◽

Electrochemical Tests ◽

Long Term Stability ◽

Spray Technique

Two composite coatings, Zn65Al15Mg5ZnO15 and Zn45Al35Mg5ZnO15, were prepared by the cold spray technique and were found to be compact, with no pits or cracks, based on scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) investigations. The results of the neutral salt spray (NSS) and electrochemical tests showed that the two composite coatings possess a suitable corrosion performance. However, the Zn45Al35Mg5ZnO15 composite coatings were more corrosion resistant and allowed a better long-term stability. In addition, they were found to exhibit the best wear resistance and photocatalytic degradation efficiency.

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Preparation and characterization of nano NC/HMX composite particles

Science and Engineering of Composite Materials ◽

10.1515/secm-2014-0287 ◽

2017 ◽

Vol 24 (1) ◽

pp. 123-128

Author(s):

Chongwei An ◽

Hequn Li ◽

Binshuo Yu ◽

Xiaoheng Geng ◽

Jingyu Wang

Keyword(s):

Electron Microscope ◽

Impact Sensitivity ◽

Composite Particles ◽

Nano Composites ◽

Thermal Stimulus ◽

X Ray Diffraction ◽

Nano Composite ◽

Transmission Electron ◽

Composite Samples

AbstractNano nitrocellulose/cyclotetramethylene tetranitramine (NC/HMX) composite particles were precipitated from their co-solutions by the spray drying method. The nano composite samples were characterized by scanning electron microscope, transmission electron microscope and X-ray diffraction. Impact sensitivity and thermal decomposition properties of nano composites were also measured and analyzed. Results show that the product particles are close to spherical in shape and range from 0.5 μm to 5 μm in size. In the product particles, β-HMX particles with size ranging from 50 nm to 100 nm are uniformly and discretely dispersed in NC binders. The drop height of nano NC/HMX composite particles (66.1 cm) is more than triple as high as that of raw HMX (21.6 cm), exhibiting considerably low impact sensitivity. Moreover, nano composite particles are easier to decompose and decomposed more rapidly than do raw HMX under the thermal stimulus due to the lower peak temperature and activation energy and higher reaction rate. Therefore, nano composites are expected to be candidates filled in high burning rate propellants.

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Corrosion Resistance of Waterborne Epoxy Resin Coating Cross-Linked by Modified Tetrabutyl Titanate

Scanning ◽

10.1155/2020/1392385 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9

Author(s):

Lingli Xu ◽

Zheng Chen ◽

Fei Huang ◽

Yinze Zuo ◽

Xingling Shi ◽

...

Keyword(s):

Corrosion Resistance ◽

Epoxy Resin ◽

Electrochemical Impedance ◽

Steel Substrate ◽

Salt Spray ◽

Tetrabutyl Titanate ◽

Cross Linking ◽

Cross Link ◽

Oh Groups ◽

Acrylic Epoxy

The development of waterborne coating is essentially important for environmental protection, and cross-linking agent is of great significance for ensuring corrosion resistance of the coating. In this work, tetrabutyl titanate was modified by ethylene glycol and tris(2-hydroxyethyl) amine and used for the solidification of waterborne acrylic-epoxy resin. Fourier-transform infrared spectroscopy (FTIR) analysis revealed that the agent reacted with OH groups first to cross-link the resin preliminarily, and then, when the amount of agent was further increased, the amino groups opened epoxide rings resulting in a secondary cross-link. Field emission scanning electron microscope (FESEM) observation and electrochemical impedance spectroscopy (EIS) test found that, when the cross-linking agent was used at 6%, the coating remains intact and kept an impedance of as high as 108Ωcm2 even after being immersed in NaCl solution for 30 days. Copper-accelerated acetic acid-salt spray (CASS) test confirmed that the coating containing 6% cross-linking agent provided the best protection for the carbon steel substrate.

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Effects of Current Density on the Microstructure and Properties of Electrodeposited Black Cr-C Nano-Composite Coatings on Steel Substrate

Materials Science Forum ◽

10.4028/www.scientific.net/msf.687.641 ◽

2011 ◽

Vol 687 ◽

pp. 641-646 ◽

Cited By ~ 1

Author(s):

Xue Song Li ◽

Yue Yang ◽

You Yang ◽

Hua Wu

Keyword(s):

Composite Coating ◽

Current Density ◽

Steel Substrate ◽

Composite Coatings ◽

Scanning Electronic Microscopy ◽

Electronic Microscopy ◽

Particle Content ◽

Nano Composite ◽

X Ray ◽

Nano Composite Coating

Eelectrodeposited black Cr-C nano-composite coating was prepared on the steel substrate and the effects of current density on the properties of the composite coating were studied in the present paper. The surface morphology and phase composition of the composite coatings were analyzed by means of scanning electronic microscopy (SEM) and X-ray diffractometer (XRD). Microhardness was determined by micrometer and the wear resistance of the coatings was evaluated by CETR using a universal materials tester (UMT). The results showed that formed under the condition of current density of 100A/dm2, temperature of 15°C, and the optimum particle content in electrolyte was 10g/l. The maximum microhardness of black Cr-C nano-composite coating was 10.8 Gpa, simutaneously, the wearing resistance of the coating improved significantly compared to the steel substrate.

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Structure of Al-AlN Composite Coatings Obtained by Arc-PVD Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.465.263 ◽

2011 ◽

Vol 465 ◽

pp. 263-266 ◽

Cited By ~ 2

Author(s):

Boguslaw Mendala

Keyword(s):

Stainless Steel ◽

Electron Microscope ◽

Chemical Composition ◽

Scanning Electron Microscope ◽

Martensitic Stainless Steel ◽

Composite Coatings ◽

Multilayer Coatings ◽

Corrosion Resistant ◽

Nitride Coatings ◽

Scanning Electron

In this paper the investigations concerning deposition of aluminium and aluminium nitride coatings by Arc-PVD method were presented. The tests were done on samples made of martensitic stainless steel EI962 (11H11N2W2MF) type. The aluminium base coatings are corrosion resistant in many environments and are anodic in comparison with most of steel. For this reason those coatings are expected to form a replacement for cadmium galvanic coatings. The main parameters of aluminium base coatings deposition by Arc-PVD processes were presented. Influence of Arc-PVD parameters on Al-AlN composite coatings structure was described. The models of Al-AlN composite coatings and Al/Al-AlN multilayer coatings as well as the scanning electron microscope microstructure and profile chemical composition by GDOS analysis of the coatings deposited on EI962 stainless steel were shown.

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Effect of Nanoalumina on the Electrochemical and Mechanical Properties of Waterborne Polyurethane Composite Coatings

Journal of Nanoparticles ◽

10.1155/2013/527432 ◽

2013 ◽

Vol 2013 ◽

pp. 1-11 ◽

Cited By ~ 6

Author(s):

Shailesh K. Dhoke ◽

Narayani Rajgopalan ◽

A. S. Khanna

Keyword(s):

Mechanical Properties ◽

Morphological Changes ◽

Steel Substrate ◽

Composite Coatings ◽

Salt Spray ◽

Waterborne Polyurethane ◽

Nanocomposite Coating ◽

Test Method ◽

Pencil Hardness ◽

Polyurethane Composite

A nanocomposite coating was formed by incorporating nanoalumina pigment in a waterborne polyurethane dispersion (WPUD) to different loading levels (0.1% and 1.0% by weight). Electrochemical performance of the nanocomposite coating was evaluated by applying these nanomodified coatings on mild steel substrate and exposing them to salt-spray, humidity, and accelerated UV weathering. The surface morphology of the composite coating was evaluated using various analytical techniques. SEM and AFM were used to investigate the dispersion of nanoalumina pigment and surface morphological changes of the nanomodified coating, before and after exposure to the test environment. Mechanical properties like scratch resistance were studied by using nanoscratch technique (Nanoindenter TI-900, Hysitron Inc, USA) and hardness using pencil hardness test method. The results showed an improvement in the corrosion, UV weathering, and mechanical properties of the coatings at lower concentration (0.1% by wt), indicating the positive effect of addition of nanoalumina pigment to the coating.

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Anti-Corrosion Performance of Four Zinc-Rich Coatings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.598.561 ◽

2012 ◽

Vol 598 ◽

pp. 561-564

Author(s):

Zhi Ming Cao ◽

Guo Xin Li ◽

Yi Liang Peng ◽

Da Wei Hu

Keyword(s):

Differential Scanning Calorimetry ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Steel Substrate ◽

Salt Spray ◽

Zinc Content ◽

Neutral Salt ◽

Corrosion Performance ◽

Scanning Calorimetry ◽

Scanning Electron

Four zinc-rich coatings were applied onto steel substrate and then placed in neutral salt spray for 4000 h in order to study the anti-corrosion performance of the coatings. The results showed that the samples with two kinds of the coatings were more seriously eroded than the others. The reasons could be that the zinc particles were dispersed inhomogeneous in the binder and the zinc content was very lower than 96 wt. % obtained through the analysis of Scanning Electron Microscope and Differential Scanning Calorimetry.

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Influence of Zinc Content on Anti-Corrosion Performance of Zinc-Rich Coatings

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.423-426.169 ◽

2013 ◽

Vol 423-426 ◽

pp. 169-172

Author(s):

Guo Xin Li ◽

Bing Jie Li ◽

Yi Liang Peng ◽

Wei Tong Yue

Keyword(s):

Electron Microscope ◽

Steel Substrate ◽

Salt Spray ◽

Zinc Content ◽

Acrylic Resin ◽

Zinc Powder ◽

Neutral Salt ◽

Corrosion Performance ◽

Amino Resin ◽

Scanning Electron

The zinc-rich coating prevents steel from corrosion by sacrificing electrochemical cathode anode protection, but the zinc content is the most important parameter. In this paper, the zinc-rich coatings made with the amino resin, acrylic resin, complex solvents, auxiliary agents and high purity zinc powder. The coatings were applied onto steel substrate and then placed in neutral salt spray for 3000 h in order to study the anti-corrosion performance. The results showed that the anti-corrosion performance was promoted with the zinc content increasing. When the zinc content was higher than 86 wt. %, the anti-corrosion performance can be reached 3000 h. The anticorrosion mechanisms were studied by polarization curves and scanning electron microscope (SEM).

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