A method of forming a gas turbine component, comprising: providing a first component section and a second component section, wherein: the first component section includes a first substrate material and the second component section includes a second substrate material; the first component section includes a first mating ridge, a second mating ridge and a first surface between the first mating ridge and the second mating ridge; and the second component section includes a third mating ridge, a fourth mating ridge, and a second surface between the first mating ridge and the second mating ridge; applying a first corrosion-resistant segment including a corrosion-resistant material to the first surface and a second corrosion-resistant segment including the corrosion-resistant material to the second surface; and joining the first component section and the second component section to form the component defining a plenum including an interior surface, a width and a length, the length being greater than the width, wherein joining the first component section and the second component section includes: fusing the first corrosion-resistant segment and the second corrosion-resistant segment into a corrosion-resistant cladding layer, wherein the corrosion-resistant cladding layer overlays the interior surface of the plenum; joining the first mating ridge to the third mating ridge along the length of the plenum; and joining the second mating ridge to the fourth mating ridge along the length of the plenum. providing a first component section and a second component section, wherein: the first component section includes a first substrate material and the second component section includes a second substrate material; the first component section includes a first mating ridge, a second mating ridge and a first surface between the first mating ridge and the second mating ridge; and the second component section includes a third mating ridge, a fourth mating ridge, and a second surface between the first mating ridge and the second mating ridge; the first component section includes a first substrate material and the second component section includes a second substrate material; the first component section includes a first mating ridge, a second mating ridge and a first surface between the first mating ridge and the second mating ridge; and the second component section includes a third mating ridge, a fourth mating ridge, and a second surface between the first mating ridge and the second mating ridge; applying a first corrosion-resistant segment including a corrosion-resistant material to the first surface and a second corrosion-resistant segment including the corrosion-resistant material to the second surface; and joining the first component section and the second component section to form the component defining a plenum including an interior surface, a width and a length, the length being greater than the width, wherein joining the first component section and the second component section includes: fusing the first corrosion-resistant segment and the second corrosion-resistant segment into a corrosion-resistant cladding layer, wherein the corrosion-resistant cladding layer overlays the interior surface of the plenum; joining the first mating ridge to the third mating ridge along the length of the plenum; and joining the second mating ridge to the fourth mating ridge along the length of the plenum. fusing the first corrosion-resistant segment and the second corrosion-resistant segment into a corrosion-resistant cladding layer, wherein the corrosion-resistant cladding layer overlays the interior surface of the plenum; joining the first mating ridge to the third mating ridge along the length of the plenum; and joining the second mating ridge to the fourth mating ridge along the length of the plenum.