Abstract
The influence of the semi-finished products manufacturing process (forging, solution annealing and ageing) on the structure and corrosion properties of the EP718 nickel-based alloy (KhN45MVTYuBR) used in the oil and gas industry is investigated. The corrosion-electrochemical properties of the alloy were determined using gravimetric and electrochemical techniques. Microstructure was studied by optical and transmission electron microscopy. It is shown that the EP718 alloy in the delivery state (without heat treatment) has the highest corrosion resistance, and corrosion properties degrade during subsequent solution annealing at 1080°C.
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