Regarding corrosion issues of ASTM 304L material after pickling
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Our company often encounters cases of corrosion occurring in materials made of ASTM 304L after acid cleaning. These materials are stainless steel 304L that has undergone solution treatment, and the acid used for cleaning is hydrofluoric acid. After acid cleaning, a sandy-like layer forms on the surface of the material. Do anyone know what causes this? After pickling, the inner surface of the 1,304L steel pipe developed sanding, while the outer surface remained intact. http://bbs.hcbbs.com/forum.php?mod=image&aid=1242513&size=300x300&key=66dfa0132bfa8c8a&nocache=yes&type=fixnone The outer surface of the 2,304L fittings develops sanding after pickling. http://bbs.hcbbs.com/forum.php?mod=image&aid=1242514&size=300x300&key=d35a1187cd0dc18d&nocache=yes&type=fixnone
It’s indeed difficult to treat acid-washed stainless steel after solution treatment; waiting for an expert
Pickling can be carried out using a mixed acid solution of 5% hydrofluoric acid + 15% nitric acid + water. This is included in the French nuclear power manufacturing RCC-M standard.
What is the formula for the acidic solution you use? Pickling temperature? Time?