The corrosion behavior of Alloy 600 and 622 coextruded coatings was evaluated using
thermogravimetric techniques under simulated low NOx combustions conditions. The corrosion
behavior of the coextruded coatings was compared to that of counterpart weld overlays and wrought
material. The results demonstrate that the coextruded coating provides corrosion resistance that is
comparable to the wrought alloy and significantly better than the weld overlay coating. The improved
corrosion resistance is attributed to elimination of dilution and microsegregation in the coextruded
coating. Additional benefits of the coextruded coating in terms of service performance are also likely,
and include better control over coating thickness/surface finish and reduced residual stresses.