Brass-to-lead junction: Utility 6
Ground water supply; chlorine disinfection; no phosphate addition
In this case, there is no galvanic corrosion and no build-up of corrosion products at the junction. The pipe scales comprise manganese oxide on the (left) brass portion and PbIV oxide on the (right) lead side. Much of the Pb oxide scale has sloughed off leaving white Pb carbonate underneath.