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Suspension-High Velocity Oxy-Fuel Spray Tio2 Coatings And Their Corrosion Behaviour

Picture for Suspension-High Velocity Oxy-Fuel Spray Tio2 Coatings And Their Corrosion Behaviour
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With the increased pollution and energy demand, industries are shifting towards cleaner and greener power generation source. Geothermal energy, where energy is derived from the sub-surface of earth, is an excellent and continuous source of energy. Despite having the potential of providing cleaner energy, there is a huge gap between the theoretical potential of geothermal power plants and their practical applications. Some of the major reasons are high power generation cost and poor efficiency of the plant.

Product Number: 51322-17637-SG
Author: Garima Mittal, Imran Bhamji, Alexandre Sabard, Shiladitya Paul
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00
$20.00

Ceramic coatings are commonly used as barrier coatings to protect the metal surface against corrosion due to possessing better wear, corrosion and heat resistant properties than metals. Titanium dioxide is one of the extensively used ceramic coatings for a broad range of applications including solar cells, self-cleaning, air purification and biomedical applications. Since coating microstructures and properties vary with the deposition method, thermal spray coatings are very promising in terms of corrosion and wear resistance. High-velocity oxy-fuel (HVOF) spray method is a commercially used eco-friendly coating method that provides better control over coating properties than most thermal spray techniques. Here, TiO2 coatings are deposited on carbon steel substrate using suspension-HVOF spray. Commercial aqueous suspension of TiO2 nanoparticles was used as a feedstock material, and sprayed at two different flowrates. The morphological analysis of the developed coatings was conducted using scanning electron microscope. To understand the wetting behavior, roughness profile, adhesion and scratch resistance of coatings, drop size analyzer, profilometer, adhesion and scratch tests were performed. Further, samples were immersed into 3.5 wt.% NaCl solution to compare the corrosion behavior of both coatings.

Ceramic coatings are commonly used as barrier coatings to protect the metal surface against corrosion due to possessing better wear, corrosion and heat resistant properties than metals. Titanium dioxide is one of the extensively used ceramic coatings for a broad range of applications including solar cells, self-cleaning, air purification and biomedical applications. Since coating microstructures and properties vary with the deposition method, thermal spray coatings are very promising in terms of corrosion and wear resistance. High-velocity oxy-fuel (HVOF) spray method is a commercially used eco-friendly coating method that provides better control over coating properties than most thermal spray techniques. Here, TiO2 coatings are deposited on carbon steel substrate using suspension-HVOF spray. Commercial aqueous suspension of TiO2 nanoparticles was used as a feedstock material, and sprayed at two different flowrates. The morphological analysis of the developed coatings was conducted using scanning electron microscope. To understand the wetting behavior, roughness profile, adhesion and scratch resistance of coatings, drop size analyzer, profilometer, adhesion and scratch tests were performed. Further, samples were immersed into 3.5 wt.% NaCl solution to compare the corrosion behavior of both coatings.

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The gap between fully immersed and ultra-thin film electrochemical measurements is wide, which suggests that the two conditions are independent of one another. There is a lot of work describing experiments, results, and trends regarding completely immersed electrochemical tests. However, in corrosion tests under thin electrolyte films, the information is not so abundant. A classical three-electrode cell used in conventional electrochemical tests cannot easily be scaled for immersion in electrolytes of micron thickness.
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Controlling corrosion of steel is expensive. The direct costs of corrosion maintenance are estimated to be over 3% of GDP every year.1 Metallic zinc coatings provide very effective corrosion protection for steel by acting first as a barrier coating, keeping corrosive elements away from the steel, and secondly as a sacrificial anode.2 Should the zinc coating be compromised, accidentally by a scratch or on purpose with a drilled hole, the zinc will provide anodic protection to the exposed steel. Metallic zinc coatings can be pure zinc or zinc-based alloys and will be referred to generically as zinc coatings in the paper. Zinc coatings can be efficiently applied by thermal spraying, which involves projecting particles of semi-molten zinc onto the surface of the steel using compressed air. With thermal sprayed zinc (TSZ) coatings, there is no size limitation to the part to be coated, and the technology is fully portable, allowing easy field applications.
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Surface And Defect Preparation Using Atmospheric Plasma For Non-Metallic Pipe Repair

Product Number: 51322-18175-SG
Author: Ahmed Hassanin, Chris Alexander, Jeffrey Piascik, Peter Yancey, Glenn Astolfi, Jeff Pavelka
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Composite repair systems’ performance relies heavily on the levels of adhesion between the initial layer of the composite system and the substrate. Enhanced adhesion translates to improved performance of the composite system since better bonding (whether mechanical or chemical) enhances the load transfer from the substrate to the composite layers as well as limit the porosity that would allow liquid or gas molecules to flow through. The aim of this study was to prove quantitatively how the APS atmospheric plasma surface preparation can improve the performance of composite repair systems whether on leaking or nonleaking defects. 
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