Does anyone know why the front of my boom is corroding where the aluminium extrusion meets the aluminium casting before the gooseneck? Better still how do I stop it? Thanks in advance to the brains trust.
Different alloys in casting and extrusion or maybe by other metals connected to them ? I use generous coatings of Duralac on both sides to isolate the cast from extrusion as well as the Monel rivets and all the stainless cheek blocks from the extrusion. Anything that leaks out of joints I wipe with dry rag and don't clean the fitting with acetone until Duralac starts to harden up. Messy but keeps corrosion at bay.
Looks like salts are collecting in the joint and are causing crevice corrosion and pitting. Not a galvanic problem. Clean them up and apply a corrosion inhibitor in the joint
