TITLE

Combating Corrosion Degradation of Turbine Materials Using HVOF Sprayed 25% (Cr3C2-25(Ni20Cr)) + NiCrAlY Coating

AUTHOR(S)
Jegadeeswaran, N.; Ramesh, M. R.; Bhat, K. Udaya
PUB. DATE
January 2013
SOURCE
International Journal of Corrosion;2013, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
High velocity oxy fuel process (HVOF) is an advanced coating process for thermal spraying of coatings on to components used in turbines. HVOF process is a thermal spray coating method and is widely used to apply wear, erosion, and corrosion protective coatings to the components used in industrial turbines. 25%(Cr3C2-25(Ni20Cr)) +NiCrAlY based coatings have been sprayed on to three turbine materials, namely, Ti-31, Superco-605, andMDN-121. Coated and uncoated substrates were subjected to hot corrosion study under cyclic conditions. Each cycle consisted of 1 hour heating at 800°C followed by 20 minutes air cooling. Gravimetric measurements were done after each cycle and a plot of weight gain as a function of number of cycles is drawn. Parabolic rate constants were estimated for the understanding of corrosion behaviour. It was observed that coated Ti-31 andMDN-121 were more resistant compared to the uncoated ones. Uncoated superco-605 was undergoing sputtering during corrosion study and hence comparison between coated and uncoated superco-605 was difficult. The cross-sectional analysis of the corroded, coated samples indicated the presence of a thin layer of chromiumoxide scale on the top of the coating and it imparted better corrosion resistance. Parabolic rate constants also indicated that coating is more beneficial to Ti-31 than to MDN-121.
ACCESSION #
95044584

 

Related Articles

  • Influence of Laser Power on the Microstructure and Anti-Wear Performance of Laser Hybrid Plasma Spraying NiCr-Cr3C2 Coatings. Shuqing Li; Shunhua Liu; Qilian Li; Yuping Duan // Advanced Materials Research;2014, Vol. 1015, p119 

    The NiCr-Cr3C2 coatings were deposited on 38CrMoAl substrate by a laser hybrid plasma spraying (LHPS) technology in this study. The coatings' microstructures and anti-wear performances with different laser power were characterized using an optical microscope, a scanning electron microscope, and...

  • Slurry Erosion Performance of Ni-AlO Based Thermal-Sprayed Coatings: Effect of Angle of Impingement. Grewal, H.; Agrawal, Anupam; Singh, H.; Shollock, B. // Journal of Thermal Spray Technology;Feb2014, Vol. 23 Issue 3, p389 

    In this paper, slurry erosion performance of high velocity flame-sprayed Ni-AlO based coatings was evaluated. The coatings were deposited on a hydroturbine steel (CA6NM) by varying the content of AlO in Ni. Using jet-type test rig, erosion behavior of coatings and bare steel was evaluated at...

  • Modeling Study of Cyclic Oxidation Behavior of NiAl and NiCr Alloys. Peng, X.; Chen, K.; Liu, R.; Liang, M. // Journal of Materials Engineering & Performance;Dec2014, Vol. 23 Issue 12, p4366 

    The cyclic oxidation behavior of four high-temperature alloys (two NiAl alloys and two NiCr alloy) is studied utilizing an existing micromechanics-based model, in which AlO and CrO are formed on the alloys as protective layers. For each alloy, the model parameters are determined based on one...

  • "Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review". Hardwicke, Canan U.; Yuk-Chiu Lau // Advanced Materials & Processes;Aug2013, Vol. 171 Issue 8, p50 

    A review of the article "Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review," by Canan U. Hardwicke and Yuk-Chiu Lau, which appeared in the June 2013 issue of the "Journal of Thermal Spray Technology," is presented.

  • A Study on the Cyclic Oxidation Behavior of Detonation-Gun-Sprayed Ni-5Al Coatings on Inconel-718 at 900 °C. Saladi, Sekar; Menghani, Jyoti; Prakash, Satya // Journal of Materials Engineering & Performance;Dec2014, Vol. 23 Issue 12, p4394 

    Cyclic oxidation behavior of detonation-gun-sprayed Ni-5Al coating on Inconel-718 is discussed in the present study. Oxidation studies were carried out on both bare and coated superalloy substrates in air at 900 °C for 100 cycles. The thermogravimetric technique was used to establish kinetics...

  • Microstructural study of NiCrAlY electrodeposits. Ul-Hamid, A.; Dafalla, H.; Al-Yousef, F.; Mohammed, Abdulrashid // Protection of Metals & Physical Chemistry of Surfaces;Sep2014, Vol. 50 Issue 5, p679 

    Pulse electrodeposition technique was used to co-deposit Ni with NiCrAlY powder on Ni-based high temperature alloy substrate. Pure nickel anode was immersed in a standard Watt's bath containing fine particles of NiCrAlY powder that were entrapped during electrodeposition to form a NiCrAlY...

  • Simplified Model for Description of HVOF NiCr Coating Properties Through Experimental Design and Diagnostic Measurements. Zois, D.; Wentz, T.; Dey, R.; Sampath, S.; Weyant, C. // Journal of Thermal Spray Technology;Mar2013, Vol. 22 Issue 2/3, p299 

    The use of factorial design in process parameter development allowed determination of the contribution of key process variables, such as flame energy (combustion pressure and O/F), spray distance, and feed rate, on in-flight particle properties. The significance of each parameter was used to...

  • Microstructure and Properties of HVOF-Sprayed WC-(W,Cr)2C-Ni Coatings. Berger, Lutz-Michael; Saaro, Sabine; Naumann, Tobias; Kašparova, Michaela; Zahálka, František // Journal of Thermal Spray Technology;Sep2008, Vol. 17 Issue 3, p395 

    The composition WC-(W,Cr)2C-Ni is one of the standard compositions used for the preparation of thermally sprayed coatings by high velocity oxy-fuel (HVOF) spraying. Surprisingly, this composition has been poorly investigated in the past. Frequent use of commercial designations...

  • Hot Corrosion Behavior of Cold-Sprayed Ni-50Cr Coating in an Incinerator Environment at 900 °C. Singh, Harminder; Sidhu, T.; Kalsi, S.; Karthikeyan, J. // Journal of Thermal Spray Technology;Feb2015, Vol. 24 Issue 3, p570 

    In the present study, 50%Ni-50%Cr coating was developed on Superni 75 superalloy by a novel and facile cold-spray coating deposition technique. Dense, adhered, and oxide-free cold-sprayed coating was obtained in this study. This coating effectively provided corrosion protection to the substrate...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics