scholarly journals Corrosion Protection of Metallic Waste Packages Using Thermal Sprayed Ceramic Coatings

1999 ◽  
Vol 556 ◽  
Author(s):  
K. R. Wilfinger ◽  
J. C. Farmer ◽  
R. W. Hopper ◽  
T. E. Shell
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Ceramic Coating ◽  
Porous Ceramic ◽  
Ceramic Coatings ◽  
Experimental Results ◽  
Metal Interface ◽  
Electrical Measurements ◽  
Corrosion Rates ◽  
Coated Carbon

AbstractCeramic coated carbon steel coupons were corrosion tested in water with dissolved salts to simulate exposure to evaporation concentrated groundwater in an underground nuclear repository. Metallography revealed no corrosion at the ceramic metal interface of dense coatings, even though electrical measurements demonstrated that the coatings were slightly porous. Experimental results and a model to predict corrosion rates influenced by a porous ceramic coating and coating lifetimes are presented.

Surface modification of graphene-coated carbon steel using aromatic molecules for enhancing corrosion resistance; comparison between type of aryl substitution with different spatial situations

2018 ◽  
Vol 65 (3) ◽  
pp. 249-262 ◽  
Author(s):  
Zahra Shams Ghahfarokhi ◽  
Mojtaba Bagherzadeh ◽  
Ebrahim Ghiamati Yazdi ◽  
Abbas Teimouri
Keyword(s):  
Surface Modification ◽  
Carbon Steel ◽  
Corrosion Protection ◽  
Protection Efficiency ◽  
Graphene Surface ◽  
Content Type ◽  
X Ray ◽  
Aromatic Molecules ◽  
Proposed Modification ◽  
Coated Carbon

Purpose The purpose of this paper is study of the type of functional group and its situation on phenyl molecule, in increasing the corrosion protection of modified graphene layers by it. Corrosion protection efficiency of graphene was raised via modifying the surface of graphene-coated carbon steel (CS/G) by using aromatic molecules. Phenyl groups with three different substitutions including COOH, NO2 and CH3 grafted to graphene via diazonium salt formation route, by using carboxy phenyl, nitro phenyl and methyl phenyl diazonium salts in ortho, meta and para spatial situations. Design/methodology/approach Molecular bindings were characterized by using X-ray diffractometer, fourier-transform infrared spectroscopy (FTIR), Raman and scanning electron microscopy (SEM)/ energy dispersive X-ray analysis (EDXA) methods. Anti-corrosion performance of modified CS/G electrodes was evaluated by weight loss and electrochemical techniques, potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy, in 3.5 per cent NaCl solution. Findings The obtained results confirmed covalently bonding of phenyl groups to the graphene surface. Also, the observed results showed that substitution spatial situations on phenyl groups can affect charge transfer resistance (Rct), corrosion potential (Ecorr), corrosion current density (jcorr) and the slope of the anodic and cathodic reaction (ßa,c), demonstrating that the proposed modification method can hinder the corrosion reactions. The proposed modification led to restoring the graphene surface defects and consequently increasing its corrosion protection efficiency. Originality/value The obtained results from electrochemical methods proved that protection efficiency was observed in order COOH < NO2 < CH3 and MPD in the para spatial situation and showed the maximum protection efficiency of 98.6 per cent in comparison to other substitutions. Finally, the ability of proposed graphene surface modification route was further proofed by using surface methods, i.e. SEM and EDXA, and contact angles measurements.

High Temperature Oxidation Behavior of (Ti, Al) C Ceramic Coatings on Carbon Steel Prepared by Electrical Discharge Coating in Kerosene

2011 ◽  
Vol 189-193 ◽  
pp. 186-192 ◽  
Author(s):  
Guo Liang Li ◽  
Xiao Hua Jie ◽  
Ling He
Keyword(s):  
High Temperature ◽  
Carbon Steel ◽  
Electrical Discharge ◽  
High Temperature Oxidation ◽  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Compact Structure ◽  
Temperature Oxidation ◽  
Before And After ◽  
High Temperature Oxidation Behavior

Multi-component metal ceramic coating（Ti, Al）C was prepared on the 0.45% carbon steel by electrical discharge coating (EDC) in a hydrocarbon medium. The coating of the samples before and after oxidation was analyzed by different methods including X-ray diffraction (XRD), scanning electron spectroscopy (SEM) and energy disperse spectroscopy (EDS).The thermogravimetric technique was used to approximate the kinetics of oxidation of the coated and the uncoated samples.The results indicated that the thickness of the coating was about 20μm, and the composition of the ceramic coating mainly consisted of (Ti, Al) C and a little Ti3AlC. An oxide film with compact structure formed after 600°C oxidation for 200h, and it was mainly composed of Al2O3and TiO2, which inhibited further oxygen diffusion into the coating. The (Ti, Al) C ceramic coating possessed slow oxidation rate and high temperature oxidation resistance.

Preparation of Zirconium Phosphate Bonded Silicon Nitride Ceramic Coatings by Cold Spray and Presureless Sintering

2014 ◽  
Vol 616 ◽  
pp. 47-51
Author(s):  
Fei Chen ◽  
Fei Yu Li ◽  
Qiang Shen ◽  
Lian Meng Zhang
Keyword(s):  
Silicon Nitride ◽  
Cold Spray ◽  
Zirconium Phosphate ◽  
Ceramic Coating ◽  
Porous Ceramic ◽  
Ceramic Coatings ◽  
Solid Loading ◽  
Spray Parameters ◽  
Silicon Nitride Ceramic ◽  
Ceramic Substrates

In the present study, a new method for preparing zirconium phosphate bonded silicon nitride (Si3N4) ceramic coatings with low porosity was developed using cold spray and pressureless sintering technique. Zirconium phosphate (ZrP2O7) was used as a binder material instead of the traditional organic materials, in order to prevent the residual carbon which was severe to the dielectric properties of the Si3N4ceramics. Firstly, aqueous Si3N4slurries with 0~40 wt.% solid loading were prepared, using deionized water as the liquid medium. Then the Si3N4slurries were cold sprayed on the Si3N4porous ceramic substrates and finally the samples were presurelessly sintered at 1000oC to achieve the Si3N4ceramic coatings. The rheological properties and viscosity of Si3N4slurries were investigated in detail, as a function of solid loading. The optimum cold spray parameters were spray distance 21 cm and spray time 20 s. The porosity of the obtained Si3N4ceramic coating was ~5 % and the interface between the coating and substrate was well bonded, without microcracks, indicating a good thermal physical match between the coating and substrate.

Analysis of corrosion protection behavior of Al2O3-TiO2 oxide ceramic coating on carbon steel pipes for petroleum industry

2018 ◽  
Vol 44 (6) ◽  
pp. 5967-5975 ◽  
Author(s):  
Mitra Akhtari Zavareh ◽  
Ahmed Aly Diaa Mohammed Sarhan ◽  
Ramin Karimzadeh ◽  
Ramesh Singh A./l.Kuldip Singh
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Ceramic Coating ◽  
Petroleum Industry ◽  
Oxide Ceramic ◽  
Steel Pipes

Thermal Cycling Life of Porous Ceramic Coatings Subjected to Thermal Gradient and Coolant Pressure

2014 ◽  
Vol 627 ◽  
pp. 293-296
Author(s):  
Masayuki Arai ◽  
T. Hayashi ◽  
T. Suidzu
Keyword(s):  
Thermal Cycling ◽  
Gas Turbine ◽  
Ceramic Coating ◽  
Cooling System ◽  
Porous Ceramic ◽  
Ceramic Coatings ◽  
Porous Coating ◽  
Coating Delamination ◽  
Porous Ceramic Coatings ◽  
Cycling Life

A transpiration cooling system for gas turbine applications has significant benefit to reduce the amount of cooling air and to increase cooling efficiency. We had developed a porous ceramic coating deposited by plasma spraying process, which can infiltrate cooling gas, and examined about those mechanical properties. In this study, thermal cycling life of this porous ceramic coating is revealed in order to apply this technology to advanced gas turbine blade in practical use. The thermal cycling test is conducted by using the hand-made device which can heat cyclically up and down around the surface of the porous coating while infiltrating cooling gas. The number of thermal cycles up to reach the coating delamination is related with maximum exposed temperature and pressure of the cooling gas as the test condition, consequently.

Corrosion protection of carbon steel by alumina-titania ceramic coatings used for industrial applications

2018 ◽  
Vol 44 (17) ◽  
pp. 21765-21773 ◽  
Author(s):  
Angie Vanessa Pinzón ◽  
Karen Julieth Urrego ◽  
Andrés González-Hernández ◽  
Mauricio Rincón Ortiz ◽  
Fabio Vargas Galvis
Keyword(s):  
Carbon Steel ◽  
Corrosion Protection ◽  
Ceramic Coatings ◽  
Industrial Applications
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