What you see below is a photo of a corrosion pit on the inside of a stainless steel tank made of 316L. Each crater is about the size of a tack weld.
I believe it is a result of a support brace welded there during the manufacturing process. There is a pattern of these things around the perimeter of the tank. It is likely that the manufacturer used "plain" carbon steel as a support brace, and just welded it to the stainless material After removal of the support brace, the spots were ground off and remained hidden until exposed to a high salt product.
The question: how can this pitting be stopped? Would grinding out/drilling out the affected area and then backfilling with 316 rod do the trick?
I believe it is a result of a support brace welded there during the manufacturing process. There is a pattern of these things around the perimeter of the tank. It is likely that the manufacturer used "plain" carbon steel as a support brace, and just welded it to the stainless material After removal of the support brace, the spots were ground off and remained hidden until exposed to a high salt product.
The question: how can this pitting be stopped? Would grinding out/drilling out the affected area and then backfilling with 316 rod do the trick?