scholarly journals The effect of Zn-Ni sublayers on the corrosion behaviour and thermal stability of epoxy coatings electrodeposited on steel

2000 ◽  
Vol 65 (12) ◽  
pp. 923-933 ◽  
Author(s):  
Vesna Miskovic-Stankovic ◽  
Jelena Bajat ◽  
Miodrag Maksimovic ◽  
Zorica Kacarevic-Popovic
Keyword(s):  
Thermal Stability ◽  
Pulse Current ◽  
Corrosion Behaviour ◽  
Epoxy Coating ◽  
Epoxy Coatings ◽  
Corrosion Stability ◽  
Ni Alloys ◽  
Protective System ◽  
Thermal Stability Of ◽  
Protective Systems

The electrochemical and transport properties, as well as the thermal stability of epoxy coatings electrodeposited on steel and steel modified by Zn-Ni alloys were investigated during exposure to 3% NaCl. The Zn-Ni alloys were electrodeposited on steel using direct and pulse current. From the time dependence of the pore resistance of the epoxy coating (impedance measurements), the diffusion coefficient of water through the epoxy coating (gravimetric liquid sorption measurements) and the thermal stability of the epoxy coating (thermogravimetric analysis), it was shown that Zn-Ni sublayers significantly improve the corrosion stability of a protective system based on an epoxy coating. The values of the pore resistance were almost unchanged over a long period of immersion time for epoxy coatings on steel modified by Zn-Ni alloys, inidicating the great stability of these protective systems.

scholarly journals Electrochemical properties and thermal stability of epoxy coatings electrodeposited on aluminium and modified aluminium surfaces

2001 ◽  
Vol 66 (11-12) ◽  
pp. 871-880 ◽  
Author(s):  
Vesna Miskovic-Stankovic ◽  
Zorica Lazarevic ◽  
Zorica Kacarevic-Popovic
Keyword(s):  
Thermal Stability ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Charge Transfer Resistance ◽  
Epoxy Coatings ◽  
Transfer Resistance ◽  
Protective Properties ◽  
Chemically Modified ◽  
Thermal Stability Of

The corrosion behaviour of epoxy coatings electrodeposited on aluminium, as well as on electrochemically and chemically modified aluminium were investigated during exposure to 3 % NaCl. Electrochemical impedance spectroscopy (EIS) and thermogravimetric analysis (TGA) were used for the determination of the protective properties of epoxy coatings on aluminium, anodized aluminium, phosphatized and chromatized-phosphatized aluminium. The protective properties of epoxy coatings on anodized and chromatized-phosphatized aluminium are significantly improved with respect to the same epoxy coatings on aluminium and phosphatized aluminium: higher values of the pore resitance and charge-transfer resistance, lower values of the coating capacitance, double-layer capacitance and relative permittivity (from EIS) smaller amount of absorbed water inside the coating (From TGA). On the other hand, the lower values of the ipdt temperature indicate a lower thermal stability of the epoxy coatings on anodized and chromatized-phosphatized aluminium.

scholarly journals Epoxy coatings electrodeposited on aluminium and modified aluminium surfaces

2002 ◽  
Vol 56 (11) ◽  
pp. 468-472
Author(s):  
Zorica Lazarevic ◽  
Vesna Miskovic-Stankovic ◽  
Zorica Kacarevic-Popovic ◽  
Dragutin Drazic
Keyword(s):  
Thermal Stability ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
The Other ◽  
Nacl Solution ◽  
H2 Evolution ◽  
Epoxy Coatings ◽  
Protective Properties ◽  
Aluminum Surfaces ◽  
Thermal Stability Of

The corrosion behaviour and thermal stability of epoxy coatings electrodeposited on modified aluminum surfaces (anodized, phosphatized and chromatized-phosphatized aluminium) were monitored during exposure to 3% NaCl solution, using electrochemical impedance spectroscopy (EIS) and thermogravimetric analysis (TGA). Better protective properties of the epoxy coatings on anodized and chromatized-phosphatized aluminum with respect to the same epoxy coatings on aluminum and phosphatized aluminum were obtained: higher values of Rp and Rct and smaller values of Cc and Cd, from EIS, and a smaller amount of absorbed water inside the coating, from TGA. On the other hand, a somewhat lower thermal stability of these coatings was obtained (smaller values of the ipdt temperature). This behavior can be explained by the less porous structure of epoxy coatings on anodized and chromatized-phosphatized aluminum, caused by a lower rate of H2 evolution and better wet ability.

Studies on adhesion characteristics and corrosion behaviour of vinyltriethoxysilane/epoxy coating protective system on aluminium

2010 ◽  
Vol 256 (11) ◽  
pp. 3508-3517 ◽  
Author(s):  
Jelena B. Bajat ◽  
Ingrid Milošev ◽  
Željka Jovanović ◽  
Vesna B. Mišković-Stanković
Keyword(s):  
Corrosion Behaviour ◽  
Epoxy Coating ◽  
Protective System

scholarly journals Protective properties of epoxy coatings electrodeposited on steel electrochemically modified by Zn-Fe alloys

2004 ◽  
Vol 58 (10) ◽  
pp. 450-456
Author(s):  
Jelena Bajat ◽  
Vesna Miskovic-Stankovic ◽  
Zorica Kacarevic-Popovic
Keyword(s):  
Prolonged Exposure ◽  
Passive Layer ◽  
Epoxy Coating ◽  
Constant Voltage ◽  
Epoxy Coatings ◽  
Corrosion Stability ◽  
Protective Properties ◽  
Water Oxygen ◽  
Current Densities ◽  
Fe Alloys

Epoxy coatings were electrodeposited on steel and steel modified by Zn-Fe alloys using the constant voltage method. Zn-Fe alloys were electrodeposited on steel at different current densities. The effect of the Zn-Fe alloy on the corrosion behavior of the epoxy coating was interpreted in terms of the electrochemical and transport properties. It was shown that the best properties, i.e. the largest values of the pore resistance and the smallest values of the coating capacitance, a longer period of almost constant Rp and Cp values, and the smallest diffusion coefficient of water through the epoxy coating, as well as the smallest amount of water absorbed inside the epoxy coating, were found for epoxy coatings on steel modified by a Zn-Fe alloy deposited at 4 A dm-2. During prolonged exposure to 3% NaCl, this Zn-Fe alloy significantly improves the corrosion stability of the epoxy coating: almost unchanged values of Rp and Rct were observed, due to the formation of a pseudo-passive layer of corrosion products, which is a good barrier to the transport of water, oxygen and electrolyte ions.

STRUCTURE AND THERMAL STABILITY OF MECHANICALLY ALLOYED Al-Co-Ni ALLOYS

2004 ◽  
Author(s):  
W. MAZIARZ ◽  
J. DUTKIEWICZ ◽  
J. ECKERT ◽  
P. VERMAUT ◽  
R. PORTIER
Keyword(s):  
Thermal Stability ◽  
Mechanically Alloyed ◽  
Ni Alloys ◽  
Thermal Stability Of

Solar Selective Coatings with Enhanced Thermal and Corrosion Stability: Electrochemically Deposited Black Chrome on Stainless Steel in the Presence of Graphite Encapsulated FeCo Nanoparticles

2014 ◽  
Vol 875-877 ◽  
pp. 388-393
Author(s):  
Belal Usmani ◽  
S. Harinipriya ◽  
Narendra Kumar ◽  
Vatsana Gupta
Keyword(s):  
Thermal Stability ◽  
Corrosion Stability ◽  
Electrochemically Deposited ◽  
Voltammetric Studies ◽  
The Stability ◽  
Ss Substrates ◽  
Solar Thermal Applications ◽  
Cyclic Voltammetric Studies ◽  
Feco Nanoparticles ◽  
Thermal Stability Of

Black chrome coatings were electrodeposited under galvanostatic conditions on SS substrates. To enhance the thermal stability of the coatings for viable usage in parabolic trough receiver tubes in solar thermal applications beyond 250°C, graphite encapsulated FeCo nanoparticles had been introduced in the electrolyte solution at different weight percentages (0.025, 0.05, 0.1). An increase in the thermal stability of the coatings in the range of 400°C to 600°C is noticed from the STA analysis. The corrosion analysis (Tafel) and cyclic voltammetric studies of the coatings in the presence and absence of nanoparticles have been carried out in 3.5% NaCl solution to understand the stability of the coating in saline environment.

Corrosion behaviour of epoxy coatings electrodeposited on galvanized steel and steel modified by Zn–Ni alloys

2000 ◽  
Vol 39 (2-4) ◽  
pp. 127-135 ◽  
Author(s):  
J.B. Bajat ◽  
Z. Kačarević-Popović ◽  
V.B. Mišković-Stanković ◽  
M.D. Maksimović
Keyword(s):  
Corrosion Behaviour ◽  
Galvanized Steel ◽  
Epoxy Coatings ◽  
Ni Alloys

Influence of alloying elements on the thermal stability of ultra-fine-grained Ni alloys

2019 ◽  
Vol 54 (14) ◽  
pp. 10506-10515 ◽  
Author(s):  
N. Zhang ◽  
Dmitry Gunderov ◽  
T. T. Yang ◽  
X. C. Cai ◽  
P. Jia ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Alloying Elements ◽  
Fine Grained ◽  
Ni Alloys ◽  
Thermal Stability Of
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