pinholes in epoxy coating
pinholes in epoxy coating
(OP)
I remember reading that pinholes in the epoxy coating is all it takes to seriously corrode the underlying material and that the epoxy coating is basically useless when the coating is scratched up.
I'm thinking this might be true for galvanic corrosion between two dissimilar metals in contact. But what about in submerged applications? Will a small pinhole in the coating of a submerged steel plate be the cause of a serious corrosion failure? I thought it was the wetted area that matters.
I'm thinking this might be true for galvanic corrosion between two dissimilar metals in contact. But what about in submerged applications? Will a small pinhole in the coating of a submerged steel plate be the cause of a serious corrosion failure? I thought it was the wetted area that matters.





RE: pinholes in epoxy coating
RE: pinholes in epoxy coating
The presence of a pinhole in an FBE coating will not necessarily cause a corrosion failure. There are thousands of miles of pipeline with FBE coating, and even though pinholes are fixed prior to backfilling not every single one gets fixed.
RE: pinholes in epoxy coating
RE: pinholes in epoxy coating
A pipe in a potable water tank should have all the same requirements. Pinholes are not acceptable.