Corrosion on Alum Parts Home › Forums › Technical Information › Corrosion on Alum Parts Tagged: alum corrosion, corrosion This topic has 0 replies, 1 voice, and was last updated 7 years, 11 months ago by Roscoe Rosché. Viewing 0 reply threads Author Posts May 24, 2016 at 20:11 #5202 Roscoe RoschéKeymaster Here is a perfect example of the corrosion to look for. This was caused by birds building a nest in the wing root (sump covers not on) and then a squirrel or many mice moved in and peed on the area. Cheers Roscoe Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In