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Studies on thermally grown oxide as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate

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矿物冶金与材料学报：英文版 2017年第6期24卷 681-690页

作者： Adam Khan Mahaboob Basha sundarrajan srinivasan Natarajan srinivasan Department of Mechanical Engineering Centre for Surface Engineering Kalasalingam University Krishnankoil 626126 Tamil Nadu India Department of Metallurgical and Materials Engineering National Institute of Technology Tiruchirapalli 620015 Tamil Nadu India Centre of Excellence in Corrosion and Surface Engineering (CECASE) National Institute of Technology Tiruchirapalli 620015 Tamil Nadu India

A thermally grown oxide layer formed by hot corrosion was investigated as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate. The hot corrosion mechanism of NiCr–Cr_2O_3 and Al_2O_3–40wt% TiO_2(A40T) plasma coated Inconel 617 was evaluated. The experiments were carried out at 1000°C using a combination of Na_2SO_4, NaCl, and V_2O_5 salts to simulate the conditions of a gas turbine in a marine environment. The hot corrosion results revealed the spallation and dissolution of oxides upon prolonged exposure. Optical images and scanning electron micrographs of the exposed samples revealed the formation of oxide scale and provided details of its morphology in NiCr–Cr_2O_3 coated samples. Microstructure characterization of A40T coatings demonstrated a thermally grown oxide(TGO) layer at 1000°C. Increasing the thickness of the TGO layer decreased the corrosion resistance. The elemental analysis and image mapping revealed the migration of active elements from the substrate and coatings toward the corrosive environment.

关键词： corrosion coatings superalloy oxides

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Corrosion behavior of as-cast Mg–8Li–3Al+xCe alloy in 3.5wt% NaCl solution

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International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1196-1203页

作者： S.Manivannan P.Dinesh R.Mahemaa Nandhakumaran MariyaPillai S.P.Kumaresh Babu srinivasan sundarrajan Department of Metallurgical and Materials Engineering National Institute of Technology Tirchirappalli 620015 Tamil Nadu India TVS Sundaram-Clayton Limited Chennai 600050 Tamil Nadu India

Mg-8Li-3Al＋xCe alloys（x = 0.5wt%, 1.0wt%, and 1.5wt%） were prepared through a casting route in an electric resistance furnace under a controlled atmosphere. The cast alloys were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The corrosion behavior of the as-cast Mg-8Li-3Al＋xCe alloys were studied under salt spray tests in 3.5wt% NaC l solution at 35°C, in accordance with standard ASTM B-117, in conjunction with potentiodynamic polarization（PDP） tests. The results show that the addition of Ce to Mg-8Li-3Al（LA83） alloy results in the formation of Al_2Ce intermetallic phase, refines both the α-Mg phase and the Mg_（17）Al_（12） intermetallic phase, and then increases the microhardness of the alloys. The results of PDP and salt spray tests reveal that an increase in Ce content to 1.5wt% decreases the corrosion rate. The best corrosion resistance is observed for the LA83 alloy sample with 1.0wt% Ce.

关键词： magnesium lithium alloys cerium sodium chloride solutions corrosion rate polarization

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