Hot corrosion failure mechanism of graphite materials in molten solar salt

2015 ◽  
Vol 132 ◽  
pp. 260-266 ◽  
Author(s):  
Yang-tao Xu ◽  
Tian-dong Xia ◽  
Wan-ping Wang ◽  
Gui-lan Zhang ◽  
Bao-lin Jia
Keyword(s):  
Failure Mechanism ◽  
Hot Corrosion ◽  
Corrosion Failure ◽  
Solar Salt

20612 Failure Mechanism by Hot Corrosion of Superheater Tube Alloy 625 in High-Efficiency Waste-to-Power Plant Boilers

2013 ◽  
Vol 2013.19 (0) ◽  
pp. 353-354
Author(s):  
Kazumasa TAKEMURA ◽  
Hiroyuki MORITA ◽  
Masayuki YOSHIBA ◽  
Masaru TAKAKURA
Keyword(s):  
Power Plant ◽  
Failure Mechanism ◽  
Hot Corrosion ◽  
High Efficiency ◽  
Alloy 625 ◽  
Superheater Tube

Risk Based Inspection (RBI) Technology in the Application of Syngas-Purification Units

2012 ◽  
Author(s):  
Zhifeng Li ◽  
Zhengxiang Wang ◽  
Junke Miao ◽  
Hui Wang
Keyword(s):  
Failure Mechanism ◽  
Chemical Industry ◽  
Hot Spot ◽  
Clean Energy ◽  
Risk Level ◽  
Corrosion Failure ◽  
On Line ◽  
Purification Unit ◽  
Gasification Reaction ◽  
Purification Equipment

In recent years, the coal chemical industry project which can replace the petrochemical products is an investment hot spot. The Syngas-purification Unit is a main part of the coal chemical industry. Its role is: purify the syngas obtained from the gasification reaction (absorb the hydrogen sulfide and carbon dioxide). Yet, there is no research and the summary about the corrosion, failure mechanism and risk level of this unit. In this paper, the syngas-purification equipment of Sinopec Qilu Corporation were quantified by RBI analysis, and investigated the corrosion of the syngas-purification equipment, and discussed the device typical failure mechanism, and proposed the recommendations of the corrosion and on-line monitoring, etc. In last few years, the production of clean energy and alternative oil chemical products from the new coal chemical projects become of great interest[1]. Because the purification of the syngas is necessary, the syngas-purification unit is one of the main equipment of coal chemical industry. In the country, there is no systematic study or summary about the corrosion, failure mechanism and risk level of the device. The RBI analysis of the Syngas-purification unit is necessary, and has some guiding significance for the routine maintenance and periodic inspection of the device. This paper introduces the corrosion and the typical failure mechanism of Syngas-purification unit followed by the risk assessment results. Then the paper puts forward the suggestion on line monitoring.

Discussion on the Interference Phenomenon of Multiple Failure Mechanisms and Determination of Dominant Failure Mechanism for Pressure Equipments

2016 ◽  
Author(s):  
Chen Xuedong ◽  
Ai Zhibin ◽  
Li Rongrong ◽  
Fan Zhichao ◽  
Xu Shuangqing ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Pressure Vessels ◽  
Intergranular Stress Corrosion ◽  
Interference Phenomenon ◽  
Corrosion Failure ◽  
Media Environment

For petrochemical pressure vessels subjected to complex media environment, the competition, inhibition, promotion and interference of multiple failure mechanisms have been discussed by several failure case analyses and experimental investigation. The main factors that influence formation of dominant failure mechanism are analyzed and the judgment principles of the dominant failure mechanism are raised in the case of interaction of multiple failure mechanisms. In this paper, relevant mechanisms are also discussed, e.g. intergranular corrosion and intergranular stress corrosion failure mechanisms of austenitic stainless steel, failure mechanisms of austenitic stainless steel when Cl− and alkaline environment exist concurrently and failure mechanism of austenitic stainless steel when medium such as Cl−, CO2, H2S, H2O, etc. exist concurrently.

Electrochemical corrosion failure mechanism of M152 steel under a salt-spray environment

2015 ◽  
Vol 22 (11) ◽  
pp. 1183-1189 ◽  
Author(s):  
Pan Yi ◽  
Kui Xiao ◽  
Kang-kang Ding ◽  
Xu Wang ◽  
Li-dan Yan ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Salt Spray ◽  
Electrochemical Corrosion ◽  
Corrosion Failure

scholarly journals Cyclic Hot Corrosion Failure Behaviors of EB-PVD TBC Systems in the Presence of Sulfate and Vanadate Molten Salts

Coatings ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 166 ◽  
Author(s):  
Yasin Ozgurluk ◽  
Kadir Doleker ◽  
Dervis Ozkan ◽  
Hayrettin Ahlatci ◽  
Abdullah Karaoglanli
Keyword(s):  
Hot Corrosion ◽  
Physical Vapor Deposition ◽  
Operating Conditions ◽  
Corrosion Failure ◽  
Bond Coats ◽  
Barrier Coating ◽  
Metallic Bond ◽  
Cold Gas Dynamic Spray ◽  
Gas Dynamic Spray ◽  
Tbc Systems

The cold gas dynamic spray (CGDS) method has been considered a promising technology to produce a metallic bond coat for thermal barrier coating (TBC) systems. In this study, CoNiCrAlY bond coats produced by CGDS method were coated with yttria-stabilized zirconia (YSZ) by electron beam physical vapor deposition (EB-PVD). TBCs were subjected to 50 wt % V2O5 and 50 wt % Na2SO4 molten hot corrosion salt combinations at 1000 °C. In the case of YSZ top coat on TBCs, the reaction between Na2SO4, V2O5, and Y2O3 salts generates YVO4 crystals, and these structures cause the transformation of tetragonal ZrO2 to monoclinic ZrO2. This situation occurs under operating conditions that lead to TBC failure. Hot corrosion behavior and the related failure mechanisms of TBC systems were investigated and discussed using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) analysis, and X-ray diffractometer (XRD).

Hot corrosion failure in the first stage nozzle of a gas turbine engine

2016 ◽  
Vol 60 ◽  
pp. 316-325 ◽  
Author(s):  
B. Salehnasab ◽  
E. Poursaeidi ◽  
S.A. Mortazavi ◽  
G.H. Farokhian
Keyword(s):  
Gas Turbine ◽  
Hot Corrosion ◽  
Gas Turbine Engine ◽  
Corrosion Failure ◽  
Turbine Engine

The effect of porosity on the hot corrosion failure of thermal barrier coatings

2015 ◽  
Vol 23 (7) ◽  
pp. 075001 ◽  
Author(s):  
Abba Abdulhamid Abubakar ◽  
Syed Sohail Akhtar ◽  
Abul Fazal M Arif ◽  
Javad Mostaghimi
Keyword(s):  
Thermal Barrier Coatings ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Corrosion Failure ◽  
Barrier Coatings

Hot corrosion behaviour of CNT-reinforced ZrO2-Y2O3 composite coatings on boiler tube steel at 900°C

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sandeep Kumar ◽  
Rakesh Bhatia ◽  
Hazoor Singh
Keyword(s):  
Molten Salt ◽  
Hot Corrosion ◽  
Corrosion Behaviour ◽  
Composite Coatings ◽  
Tube Steel ◽  
Boiler Tube ◽  
Protective Oxide ◽  
Corrosion Failure ◽  
Content Type ◽  
Boiler Tube Steel

Purpose In Indian thermal power plants, the main cause of boiler tube failure is the presence of molten sulphates and vanadates, which deteriorate the tube material at high temperatures. To combat the hot corrosion failure of metals, thermal spray technology is adopted. This study aims to investigate and study the effect of hot corrosion behaviour of carbon nanotube (CNT)-reinforced ZrO2-Y2O3 composite coatings on T-91 boiler tube steel in a molten salt environment at 900 °C for 50 cycles. Design/methodology/approach A plasma spray technique was used for development of the coatings. The samples were exposed to hot corrosion in a silicon tube furnace at 900 °C for 50 cycles. After testing, the test coupons were analysed by X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and cross-sectional analysis techniques to aid understanding the kinetics of the corrosion reaction. Findings CNT-based reinforced coatings showed lower weight gain along with the formation of protective oxide scales during the experimentation. Improvement in protection against hot corrosion was observed with increase in CNT content in the coating matrix. Originality/value It is pertinent to mention here that the high temperature behaviour of CNT-reinforced ZrO2-Y2O3 composite on T-91 steel at 900°C temperature in molten salt environment has never been studied. Thus, the present research was conducted to provide useful results for the application of CNT-reinforced composite coatings at elevated temperature.

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