pickling and passivating
guide
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- pickling - the process of removing discoloration of stainless steel after welding which caused reduction of the chromium content on the steel surface; the pickling effect is achieved in a pickling bath treatment or locally with pastes and gels
| pickling bath | solution | |
| for austenitic steel | for ferritic steel | |
| 52% nitric acid (36° Baumégo) | 100 litres | 100 litres |
|
65% hydrofluoric acid
or sodium fluoride
|
20 litres 30 kg |
100 litres 15 kg |
| water | 900 litres | 900litres |
| bath time at 20ºC | approximately between 15 min and 3 h | |
- passivation - restoring corrosion resistance of the steel through the oxidising effects of acids; passivation is achieved in a passivation bath, or by local application of pastes and gels
| passivation bath | solution | ||||
| 52% nitric acid (36° Baumégo) | 250 litres | ||||
| water | 750 litres | ||||
| bath time at 20ºC | between from 15 min and 1h | ||||
| compiled based on the Euro Inox: ‘Welding of Stainless Steel’ | |||||
This catalogue has been produced to the best of out knowledge and experience, and is intended to assist you. Be sure we have taken all care to be certain that the information provided is technically correct. Nevertheless, it cannot be deemed the binding standard or substantiate guarantee or indemnity claims.
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