Protective Coatings for Polymer Composites

2006 ◽  
Author(s):  
U. V. Diccar ◽  
I. Ahmed ◽  
S. M. Vyawahare ◽  
G. Talia
Keyword(s):  
Polymer Composites ◽  
Thermal Spray ◽  
Protective Coatings ◽  
Zinc Coating ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Aviation Industry ◽  
Plasma Flame ◽  
Bond Coating ◽  
Electro Magnetic

Thermal spray coating is being studied as one of the techniques used for coating graphite reinforced polymer composites, which are extensively used in the aviation industry. These coatings are studied for improvement of surface properties such as erosion resistance, UV protection, property retention and electro magnetic shielding. NiAl (63:35) (65%Ni,35%Al) intermetallic, NiAl (95:5) (95%Ni,5%Al), Aluminum and Zinc coating were thermal-spray deposited using different procedures (plasma, flame, electric wire arc) onto composite specimens. Two categories of coating were evaluated: Coatings with bond coating and coatings without bond coating. These coatings were tested for protection against erosion encountered by aircraft components. The microstructures and micro-hardness of these coatings were determined. The bond strength between the substrate and the coating layer was evaluated by means of adhesion tests. The results obtained are discussed, with special attention being paid to the specific characteristics of the different spraying procedures.

scholarly journals Biofilm Formation Plays a Crucial Rule in the Initial Step of Carbon Steel Corrosion in Air and Water Environments

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 923 ◽  
Author(s):  
Akiko Ogawa ◽  
Keito Takakura ◽  
Nobumitsu Hirai ◽  
Hideyuki Kanematsu ◽  
Daisuke Kuroda ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Thermal Spray ◽  
Biofilm Formation ◽  
Zinc Coating ◽  
Electrochemical Corrosion ◽  
Spray Coating ◽  
Steel Corrosion ◽  
Thermal Spray Coating ◽  
Iron Corrosion ◽  
Microbially Influenced Corrosion

In this study, we examined the relationship between the effect of a zinc coating on protecting carbon steel against biofilm formation in both air and water environments. SS400 carbon steel coupons were covered with a zinc thermal spray coating or copper thermal spray coating. Coated coupons were exposed to either air or water conditions. Following exposure, the surface conditions of each coupon were observed using optical microscopy, and quantitatively analyzed using an x-ray fluorescence analyzer. Debris on the surface of the coupons was used for biofilm analysis including crystal violet staining for quantification, Raman spectroscopic analysis for qualification, and microbiome analysis. The results showed that the zinc thermal spray coating significantly inhibited iron corrosion as well as biofilm formation in both air and water environments. The copper thermal spray coating, however, accelerated iron corrosion in both air and water environments, but accelerated biofilm formation only in a water environment. microbially-influenced-corrosion-related bacteria were barely detected on any coupons, whereas biofilms were detected on all coupons. To summarize these results, electrochemical corrosion is dominant in an air environment and microbially influenced corrosion is strongly involved in water corrosion. Additionally, biofilm formation plays a crucial rule in carbon steel corrosion in both air and water, even though microbially-influenced-corrosion-related bacteria are barely involved in this corrosion.

Prediction of Best Combination of Process Parameters for Detonation Gun Coating Process through Taguchi Technique

2014 ◽  
Vol 984-985 ◽  
pp. 520-525
Author(s):  
K.N. Balan ◽  
S. Manimaran ◽  
A. Johnrajan ◽  
E.V.V. Ramanamoorthy
Keyword(s):  
Thermal Spray ◽  
Process Parameters ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Major Effect ◽  
Aviation Industry ◽  
Optimum Process ◽  
Coating Process ◽  
Marine Industry ◽  
Detonation Gun

Detonation gun spray coating method (D-Spray) [1] is one of the effective method of thermal spray coating process. The surface of material or substrate will be enhanced by deposition of coating powders such as metal oxides and ceramics like aluminium oxides, tungsten carbide ,nickel chromium etc by D-spray method that prevents the metal from corrosion and to increase the wear resistance. This coating process had wide applications in different engineering sectors such as aviation industry, marine industry, biomedical industry etc., In this Experimental study the Process parameter optimization of D-spray coating process which is one of the Thermal spray Coating process was done by Taguchi method, [3] in order to find the best processing conditions and to get higher quality of coating. [6] Microhardness was estimated for various combinations of parameters and the optimum process parameters were obtained. Best combination of process parameters has been predicted which results that the thickness of the coating has got a major effect.

Preparation of spherical Y2SiO5 powders for thermal-spray coating

Particuology ◽  
2009 ◽  
Vol 7 (5) ◽  
pp. 368-372 ◽  
Author(s):  
Yangbao Qian ◽  
Linzhong Du ◽  
Weigang Zhang
Keyword(s):  
Thermal Spray ◽  
Spray Coating ◽  
Thermal Spray Coating

Investigation into the Effects of High Temperature on Mechanical Properties of Thermal Spray Coatings Applied by Plasma Spraying

2018 ◽  
Vol 284 ◽  
pp. 1151-1156
Author(s):  
Lenar N. Shafigullin ◽  
A.R. Ibragimov ◽  
A.I. Saifutdinov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Temperature ◽  
Thermal Spray ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Thermal Spray Coatings ◽  
Spray Coatings ◽  
Heat Treatment Of Coatings ◽  
Double Heat Treatment

C. C. Berndt advanced investigations of mechanical properties of thermal spray coatings under 4-point bending. He found that this investigation method is sensitive to the mechanical properties of thermal spray coatings.This paper contains the detailed investigation results for thermal spray coatings of zirconium dioxide under 4-point bending, i.e. tests of the specimens subjected to spraying at varying conditions and pre-test soaking with the various duration at 1100 °С.It was established how the mechanical properties of thermal spray coatings changed depending on the spraying mode and high temperature soaking. The test results show that the double heat treatment of coatings is more preferable than one-time heat treatment as it make the properties change linearly. It is more easily controllable during operation of the components with thermal spray coating.

scholarly journals Thermal Spray Coating: A New Way of Protecting Wood

BioResources ◽  
2016 ◽  
Vol 12 (1) ◽  
Author(s):  
Mojgan Nejad ◽  
Romina Shafaghi ◽  
Larry Pershin ◽  
Javad Mostaghimi ◽  
Paul Cooper
Keyword(s):  
Thermal Spray ◽  
Spray Coating ◽  
Thermal Spray Coating
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