"316L in contact with Phosphoric Acid + NaOH"
"Does anyone have experience of the susceptibility to corrosion of 316L SS to the cycling presence of phosphoric acid followed by low/intermediate conc. sodium hydroxide solution. Some of our cold formed thin plate (3-5mm) SS components have shown some pitting/holes in this environment (up to 80C/180F) although no discolouration has been seen. Can the acid/alkaline rinse be the cause? The solutions would only be present for 60minutes per day. The remainder of the time the atmosphere would be dry at 60C."
With the plate being so thin, you might want to investigate whether the pinholing is occurring at non-metallic inclusions. 316SS, otherwise should resist both environments, based on your stated conditions.
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