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

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
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.

scholarly journals Few-layer graphene aqueous suspensions for polyurethane composite coatings

MRS Advances ◽  
2016 ◽  
Vol 2 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Eunice Cunha ◽  
Fernando Duarte ◽  
M. Fernanda Proença ◽  
M. Conceição Paiva
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Composite Coatings ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Waterborne Polyurethane ◽  
Vapor Permeability ◽  
Layer Graphene ◽  
Polyurethane Composite ◽  
Few Layer Graphene

ABSTRACTGraphite nanoplates (GnP) have recently attracted attention as an economically viable alternative for the development of functional and structural nanocomposites. The incorporation of GnP into waterborne polyurethane (WPU) with loadings from 0.1 to 10 wt.% was studied. The mechanical properties of the composite films were assessed by tensile testing showing an increase of the Young’s modulus up to 48%. The electrical conductivity increased by 9 orders of magnitude and the water vapor permeability of the composite films decreased 57% for composites containing 5.0 wt.% of GnP.

scholarly journals Anti-Corrosive Coating of Carbon-Steel Assisted by Polymer-Camphorsulfonic Acid Embedded within Graphene

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 879 ◽  
Author(s):  
Yingying Zhai ◽  
Kefeng Pan ◽  
Ende Zhang
Keyword(s):  
Carbon Steel ◽  
In Situ Polymerization ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Waterborne Polyurethane ◽  
Shielding Effect ◽  
Multilayer Graphene ◽  
X Ray Diffraction ◽  
Corrosive Media ◽  
Polyurethane Composite

A novel, economic and environmentally friendly anticorrosion coating material for metals is introduced and investigated in this paper. For this purpose, camphor-sulfonic-acid/graphene-doped poly(o-toluidine) composites (MG/CSA@POT) were fabricated using in-situ polymerization with (NH4)2S2O8 as an oxidant. The structure and the morphology of MG/CSA@POT were analyzed using FTIR (Fourier-transform infrared spectroscopy), XRD (X-ray diffraction), and SEM (Scanning Electron Microscope). Multilayer graphene (MG)/CSA@POT-polyurethane composite coatings (MG/CSA@POT-WPU) were prepared on the surface of a carbon steel substrate by mixing MG/CSA@POT with waterborne polyurethane via blending. The corrosion performance of the MG/CSA@POT-WPU composite coatings in a 3.5% NaCl solution was studied with a corrosion electrochemical method. The results showed that 5-MG/CSA@POT-WPU had the best shielding effect on corrosive media and the lowest corrosion rate (1.02 × 10−6 mm/year) compared to other coatings while its inhibition efficiency reached 99.96%.

ANTICORROSION PERFORMANCE OF SELF-HEALING POLYMERIC COATINGS ON LOW CARBON STEEL SUBSTRATES

2017 ◽  
Vol 79 (7-4) ◽  
Author(s):  
Muhammad Ashraff Ahmad Seri ◽  
Esah Hamzah ◽  
Abdelsalam Ahdash ◽  
Mohd Fauzi Mamat
Keyword(s):  
Steel Substrate ◽  
Salt Spray ◽  
Immersion Test ◽  
Salt Spray Test ◽  
Test Method ◽  
The Self ◽  
Self Healing ◽  
Pure Epoxy ◽  
Steel Substrates ◽  
Epoxy Paint

Recently, self-healing coating is classified as one of the smart coatings which has the ability to heal or repair damage of the coating to prevent further corrosion. The aim of this study is to synthesize the self-healing coatings from polymeric material and evaluate the performance and their corrosion behavior when coated on steel substrates. The corrosion tests were performed using immersion test and salt spray test method at room temperature. The immersion test shows that self-healing coating gives lower corrosion rate compared to pure epoxy paint, with a value of 0.02 and 0.05 mm/year respectively. Also, salt spray test shows similar trend as the immersion test, which is 0.11 and 0.19 mm/year for self-healing coating and pure epoxy paint respectively. While uncoated samples without any protection corroded at 0.89 mm/year. It was also found that the damage on self-healing coating was covered with zeolite from the microcapsules indicating that the self-healing agent was successfully synthesized and could function well. In other words, self-healing coating shows better corrosion resistance compared to the pure epoxy coating on steel substrate.

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

2020 ◽  
Vol 20 (10) ◽  
pp. 6389-6395 ◽  
Author(s):  
Chuan-Chun Li ◽  
Tang-Yu Lai ◽  
Te-Hua Fang
Keyword(s):  
Electron Microscope ◽  
Epoxy Resin ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Salt Spray ◽  
Nano Composites ◽  
Silicone Resin ◽  
Nano Composite ◽  
Corrosion Resistant ◽  
Zn Nanoparticles

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.

Research on the Corrosion Resistance of Ni-ZrO2 Nanocomposite Coatings

2014 ◽  
Vol 633-634 ◽  
pp. 787-790
Author(s):  
Lin Wang ◽  
Jin Lin Lu ◽  
Cheng Wei Li ◽  
Shu Mei Kang
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
Composite Coatings ◽  
Process Condition ◽  
Corrosion Current ◽  
Bath Temperature ◽  
Nanocomposite Coating ◽  
Test Method ◽  
Optimum Process ◽  
Orthogonal Test Method

In order to improve the corrosion resistance of Ni-nanoZrO2 composite coatings. By orthogonal test method,the process for composite electroplating of Ni-ZrO2 was optimized involved current density、bath temperature、the ZrO2 particle concentration. Corrosion resistance and the hardness were tested, microstructure was observed with a scanning electron microscope. The optimized technological conditions are:current density i4A/dm2,bath temperature 45°C, nanoZrO2 addition 7g/L. In this optimum process condition, corrosion current density is 6.186×10-6 A/cm2, corrosion resistance is good, and its hardness is much better than pure nickel plating, also a flat morphology and compact microstructure Ni-ZrO2 nanocomposite coating is get.

scholarly journals Synthesis of Silane Functionalized Graphene Oxide and Its Application in Anti-Corrosion Waterborne Polyurethane Composite Coatings

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 587 ◽  
Author(s):  
Chao Chen ◽  
Shicheng Wei ◽  
Bin Xiang ◽  
Bo Wang ◽  
Yujiang Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Condensation Reaction ◽  
Waterborne Polyurethane ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Polyurethane Composite ◽  
Modified Graphene Oxide

In this study, novel silane functionalized graphene oxide (PVSQ-GO) composite material is synthesized through the hydrolysis condensation reaction of vinyl triethoxysilane monomers occurred at the surface of graphene oxide. Results obtained from FTIR, Raman, X-ray photoelectronic spectroscopy (XPS), XRD and TGA measurements reveal that polyvinyl sesquisiloxane microspheres adhere to graphene oxide lamellae in the form of chemical bonds. Meanwhile, it is intuitive that abundant polyvinyl sesquisiloxane microspheres stick to the surface of graphene oxide and increase the thickness of the flake. Modified graphene oxide changes from hydrophilicity to hydrophobicity were owing to the existence of polyvinyl sesquisiloxane microspheres on the surface of graphene oxide (GO). PVSQ-GO composite exhibited good dispersion in eco-friendly waterborne polyurethane coating. Electrochemical impedance spectroscopy manifested that the anti-corrosion performance of waterborne polyurethane (WPU) coating embedded at 0.5 wt.% PVSQ-GO composite improved effectively. Tafel curves reveal that 0.5 wt.% PVSQ-GO/WPU coating specimen shows the lowest corrosion rate of 8.95 × 10−5 mm/year when compared with the other coating specimens. The good anti-corrosion abilities of PVSQ-GO composite coating can be interpreted as the good compatibility between PVSQ-GO composite and waterborne polyurethane, however, the intrinsic hydrophobicity of PVSQ-GO composite is beneficial to inhibit the permeation of corrosive medium and thus slows down the corrosion rate.

scholarly journals Enhanced mechanical properties of polyurethane composite coatings through nanosilica addition

2016 ◽  
Vol 90 ◽  
pp. 243-251 ◽  
Author(s):  
Suraj Maganty ◽  
Maria P.C. Roma ◽  
Stephan J. Meschter ◽  
Dale Starkey ◽  
Mario Gomez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Coatings ◽  
Polyurethane Composite

scholarly journals Mechanical Properties of Epoxy/Clay Composite Coatings on an X65 Steel Substrate

2021 ◽  
Vol 8 (1) ◽  
pp. 1944015
Author(s):  
Odette F. Ngasoh ◽  
Vitalis C. Anye ◽  
Emeso B. Ojo ◽  
Tido T. Stanislas ◽  
Abdulhakeem Bello ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Steel Substrate ◽  
Composite Coatings ◽  
X65 Steel

Study of Corrosion Performance of Electroless Ni-P Coating with Molybdenum Disulfide Nanoparticles

2008 ◽  
Vol 373-374 ◽  
pp. 256-259 ◽  
Author(s):  
Xian Guo Hu ◽  
Wen Ju Cai ◽  
Jiu Cong Wan ◽  
Yu Fu Xu ◽  
Xiao Jun Sun
Keyword(s):  
Corrosion Resistance ◽  
Molybdenum Disulfide ◽  
Composite Coating ◽  
Steel Substrate ◽  
Surface Film ◽  
Composite Coatings ◽  
Salt Spray ◽  
Optical Microscope ◽  
Corrosion Mechanism ◽  
Corrosion Properties

The electroless nickel-phosphor coatings containing molybdenum disulfide nanoparticles were prepared and analyzed in this paper. The effects of incorporation of MoS2 into the Ni-P coating on the morphology of the coating surface and corrosion properties were also studied. Corrosion tests were conducted inside a salt spray box with NaCl solution (5.0 wt%). The corrosional surfaces were studied and analyzed through optical microscope, X-ray spectrometer (XRD) and scanning electron microscopy (SEM). The investigation on the relationship between heat-treatment and the corrosion resistance of the coatings showed that the corrosion resistance of the composite coating became worse because of the occurrence of transformation from non-crystalline to crystalline, and then increased the metastable intergradation of the composite coating. Meanwhile, the experimental results also showed that corrosion resistance of the coating containing MoS2 was higher than that of steel substrate. The corrosion mechanism of the composite coatings was mainly ascribed to the formation of micro-cell around the nanosized MoS2 particles, and the active ion like Cl- destroyed the surface film and induced the corrosion towards the inside part of coating.

Effect of rare earth lanthanum-cerium doping on corrosion behavior of zinc-aluminum-magnesium hot-dip galvanizing coatings used for transmission towers

2018 ◽  
Vol 65 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Yu Han ◽  
Yanqiu Xia ◽  
Xin Chen ◽  
Liang Sun ◽  
Dongyu Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Rare Earths ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Salt Spray ◽  
X Ray Diffraction ◽  
Copper Strip ◽  
Cross Sectional ◽  
Content Type ◽  
Transmission Towers

Purpose The purpose of this study is to improve the corrosion resistance of the transmission towers by Zinc-aluminum-magnesium (Zn-Al-Mg) coatings doped with rare earths lanthanum (La) and cerium (Ce) (denoted as Zn-Al-Mg-Re) in Q345 steel. Design/methodology/approach The phase structure of Zn-Al-Mg-Re composite coatings has been determined by X-ray diffraction, whereas their surface morphology and cross-sectional microstructure as well as cross-sectional elemental composition have been analyzed by scanning electron microscopy and energy-dispersive spectrometry. Moreover, the corrosion resistance of Zn-Al-Mg-Re composite coatings has been evaluated by acetic acid accelerated salt spray test of copper strip. Findings Experimental results show that doping with La and Ce favors to tune the composition (along with the generation of new phase, such as LaAl3 or Al11Ce3) and refine the microstructure of Zn-Al-Mg galvanizing coatings, thereby significantly improving the corrosion resistance of the coatings. Particularly, Zn-Al-Mg-Re with 0.15% (mass fraction) La exhibits the best corrosion resistance among the tested galvanizing coatings. Originality/Value Zinc-aluminum-magnesium (Zn-Al-Mg) coatings doped with rare earths lanthanum (La) and cerium (Ce) (denoted as Zn-Al-Mg-Re) have been prepared on Q345 steel substrate by hot-dip galvanizing so as to improve the corrosion resistance of the transmission towers, and to understand the corrosion inhibition of the Zn-Al-Mg-Re coating.

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