Abstract: Embodiments herein relate to screen assemblies for fenestration units configured to reduce corrosion issues. In an embodiment, a screen assembly is included having a frame, the frame defining a spline channel; a mesh, the mesh can include a peripheral edge, wherein the peripheral edge is disposed within the spline channel; a spline, wherein the spline is fitted within the spline channel and holds the peripheral edge in place; and a polymeric barrier layer, wherein the polymeric barrier layer separates at least one of the mesh and the frame, the mesh and the spline, or the frame and the spline from electrical contact with one another. Other embodiments are also included herein.