High-temperature hot corrosion kinetics of PVD Ti1-xAlxN coatings on Nimonic c-263
Source abstract
Abstract
The high-temperature hot corrosion (HTHC) behavior of Ti1-xAlxN-coated c-263 alloy was studied with- and without a Na2SO4/MgSO4 salt mixture at 850 °C in a SOx-rich atmosphere. In absence of the salt deposit, both, the bare c-263 alloy and cathodic arc evaporated Ti1-xAlxN specimens follow a quasi-cubic corrosion rate. However, when exposed to salt under identical conditions, the rates increase significantly, featuring a compounded parabolic-linear rate law for the c-263 alloy, and a parabolic-like rate behavior for Ti1-xAlxN-coated specimens. The rate-determining step of the HTHC mechanism was attributed to a nitride-to-oxide transformation, followed by a sequential fluxing of the formed oxides.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Metal and Thin Film Mechanics · High-Temperature Coating Behaviors · Nuclear Materials and Properties
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