Patent 9777583 was granted and assigned to Rolls-Royce on October, 2017 by the United States Patent and Trademark Office.
A platinum plus chromium coating applied to the roots and firtrees of turbine blades where the inclusion of chromium creates a single phase outer zone which minimizes diffusion paths for sulphur which can preferentially diffuse down phase boundaries and enables a chromium rich outer oxide scale to form on top of the coating.