I have a weldment made of A513 Tube. The part is finished with the QPQ process. The final assembly has this part placed inside another tube of 4140 material and enclosed with plastic caps to keep moisture out. Recently we are finding a noticeable amount of wet salt deposits on the inside of the QPQ Tube. We clean it out and after a few weeks it comes back. Any ideas why our parts "sweat" salt?
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