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 . <EOS>