Coatings and Surface Engineering for Environmental Protection II: Poster Session
Sponsored by: TMS Structural Materials Division, TMS: Corrosion and Environmental Effects Committee
Program Organizers: Arif Mubarok, PPG; Raul Rebak, GE Global Research; Rajeev Gupta, North Carolina State University; Tushar Borkar, Cleveland State University; Brian Okerberg, PPG Industries; Michael Mayo, PPG Industries
Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
Session Chair: Arif Mubarok, PPG; Raul Rebak, GE Global Research; Tushar Borkar, Cleveland State University
C-1: Advanced Coating and Surface Modification Technologies for SiC-SiCf Composites for Hydrothermal Corrosion Protection in LWRs: Kyle Quillin1; Hwasung Yeom1; Tyler Dabney1; John Lacy1; Peng Xu2; Kumar Sridharan1; 1University of Wisconsin, Madison; 2Westinghouse Electric Company
SiC-SiCf composites are being investigated as fuel cladding materials for the next generation light water reactors (LWR) due to their high temperature stability and resistance to irradiation. SiC-SiCf cladding offers excellent safety performance in a loss-of-coolant accident compared to current zirconium-alloy claddings. One challenge in the implementation of this composite for LWR cladding application is the hydrothermal corrosion of SiC at normal reactor operating conditions. In this work, a variety of environmental barrier coatings and coating technologies are being investigated to mitigate the corrosion of SiC. A wide range of coating technologies with candidate coating materials has been developed and evaluated. The near-surface microstructural developments and mechanical properties, and preliminary results of hydrothermal corrosion tests of candidate coating materials will be presented.
Cancelled
C-2: Anti-Corrosive Properties and Theoretical Studies of Some Thiosemicarbazide Compounds on Mild Steel Corrosion in Hydrochloric Acid: Esra Sezer1; Emel Bayol1; A. Ali Gürten2; Fatma Kandemirli3; Yusuf Akkaya1; 1Niğde Ömer Halisdemir University; 2Osmaniye Korkut Ata University; 3Kastamonu University
The corrosion behavior of mild steel in 1.0 M HCl by 4-nitrophenyl-3-thiosemicarbazide (TSC-NO2) has been studied with electrochemical methods and quantum chemical methods. The electrochemical tests show that the polarization resistance of MS increasing the presence of inhibitors in acid solution. Potentiodynamic polarization studies reveal that this molecule act as an efficient mixed type inhibitor. The associated activation energy of corrosion has been determined. The adsorption of these inhibitors on the mild steel surface in acidic medium obeys the Langmuir absorption isotherm. The surface morphologies of the MS were analyzed with scanning electron microscope at 120 h exposure period by scanning electron microscopy (SEM). The density functional theory (DFT) at the B3LYP functional with the 6-311 G(d,p) basis set were performed for compound.Keywords: Thiosemicarbazide, Mild Steel; EIS; Acid Corrosion; Density Functional Theory
C-3: Corrosion Resistance and Electrochemical Corrosion Characteristics of Stainless Steel for Seawater Desalination Evaporator: Yangang Zhang1; Liang Liao1; Zhangfu Yuan1; Chunhong Shi1; 1University of Science and Technology Beijing
In order to explore the corrosion resistance of super stainless steels used in low temperature multiple seawater desalination device, S32205 duplex stainless steel and the super duplex stainless steel S32750 were tested by salt spray, alternate-immersion and full immersion tests and were studied by weight loss method. Electrochemical parameters characterizing corrosion resistance of stainless steel were obtained by measuring the potentiodynamic polarization and electrochemical impedance of the stainless steel. The results show that two kinds of stainless steels perform good corrosion resistance, the super duplex stainless steel S32750 has less pitting trace than S32205 duplex stainless steel. With the increase of temperature and concentration, the results the pitting potential decreases, the passivation current density and pitting sensitivity increases. The electrochemical impedance decreases with the increase of temperature and concentration. Compared with S32205 duplex stainless steel, the super duplex stainless steel S32750 has better corrosion resistance.
C-4: Development of Corrosion Barrier Coatings for U3Si2 Nuclear Fuel Pellets for Light Water Reactors: John Lacy1; Hwasung Yeom1; Lu Cai2; Kathryn Metzger2; Edward Lahoda2; Kumar Sridharan1; 1University of Wisconsin, Madison; 2Westinghouse Electric Company
U3Si2 is being considered for accident tolerant fuel due to superior thermal properties as a result of its higher uranium density compared to UO2. However, published data shows that U3Si2 may experience hydrothermal corrosion in leaking fuel rod conditions, wherein the fuel cladding is breached leading to contact between the water coolant and the fuel pellet. To mitigate the corrosion, the U3Si2 pellets may be coated with a hydrothermal barrier coating to minimize pellet degradation. Several coating options have been investigated to inhibit the corrosion of U3Si2 pellets for commercial applications. These options include oxidation resistant glass, ceramic, and metallic coatings. The coatings were applied to surrogate substrates using dip coating, PVD, and CVD methods. Initial characterization consisted of SEM-EDS and XRD analyses. After characterization, the coated samples were subjected to a pressurized steam autoclave for evaluation of the corrosion behavior in prototypical reactor operation conditions.
C-5: Establishment of a Lead Loop Facility to Support Lead Cooled Fast Reactor Design: Osman Anderoglu1; Cemal Cakez1; Shuprio Ghosh1; Khaled Talaat1; Sang Lee1; Youho Lee2; Keith Woloshun3; Seung Kim3; Stuart Maloy3; Cetin Unal3; Michael Ickes4; Paolo Ferroni4; 1University of New Mexico; 2Seoul National University; 3Los Alamos National Laboratory; 4Westinghouse Electric Company
Fast reactor technology have been hampered by structural materials development. In particular, the molten lead/lead-bismuth-eutectic attack and dissolve structural alloys. The current lack of a general solution to this problem has been a major impediment to the commercialization of LFRs. A summary of the capabilities of the new lead loop facility at the UNM will be presented. The main objectives of this facility are to design and conduct material compatibility study with molten lead up to 700°C under flowing conditions of 3 m/s.
C-6: Microstructure Characteristics after Combustion and Fireproof Mechanism of TiAl-based Alloys: Peixuan Ouyang1; Guangbao Mi2; Peijie Li3; Shuting Zhang4; 1North China University of Technology;Tsinghua University; 2AECC Beijing Institute of Aeronautical Materials; 3Tsinghua University; 4North China University of Technology
TiAl-based alloys were combusted by friction in oxygen-enriched atmosphere. The microstructures and elemental distributions of the combusted specimens were investigated. The fireproof mechanism of TiAl alloys was revealed through discussing the combustion process in thermodynamics and kinetics. The results show that there are regional variations in microstructures of the combusted TiAl alloys, including heat affected zone, fusing zone and combustion zone. The excellent fireproof performance of TiAl alloys results from the formation of Al2O3-enriched microstructures in the combustion zone, which is attributed to the selective oxidation of Al during the combustion process.
C-7: Nanoceramic Coatings for Heavy Liquid Metal Applications: Boris Paladino1; Matteo Vanazzi1; Daniele Iadicicco1; Serena Bassini2; Marco Utili2; Fabio Di Fonzo1; 1Istituto Italiano di Tecnologia (IIT); 2ENEA
Heavy liquid metals are foreseen as cooling media for different technologies: concentrated solar power systems, Generation IV and fusion nuclear reactors. This is due to several properties: high thermal conduction, low melting point, high boiling temperature, low thermal expansion and non-violent reactions with water. Nevertheless, structural steels suffer corrosion by dissolution and liquid metal embrittlement when facing these materials, hence the mechanical integrity of the system is threatened. A possible mitigation strategy is the employment of nanoceramic coatings. Alumina films grown by Pulsed Laser Deposition (PLD) technique were tested in different conditions (temperature up to 600°C, Oxygen content, exposure time) in static and fluent Pb and Pb-16Li. After up to 10000 hours, no corrosive attacks on the steel substrate and no delamination were detected (SEM and EDX analyses). Thus, PLD-grown Alumina coatings act as protective barriers, proving to be one of the few viable solutions for these technologies.
C-8: Pitting Corrosion in Ferritic Stainless Steels: Orlando Ledezma Villa1; Emmanuel Sanchez Aguilar1; 1Universidad Autonoma de Nuevo Leon
In this research work the results show the electrochemical noise conditions for the materials that present pitting corrosion, in time series in potential and current. The measurements are made at the time of exposure, the materials used are austenitic stainless steels 304 and ferritic steels 409, 409-AL and 439; The electrolytes that are used to use are〖 H〗_2 O, 〖MgCl〗_2 3.5 % , 〖CaCl〗_2 3.5% y NaCl al 3.5%.