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This study has gathered a large quantity of data on stainless steels and nickel alloys used in the purification industry. Materials were tested to evaluate their resistance to corrosion in acidic environments. It was shown that the chemical composition of the material affected its behaviour. A table summarising the results of the study was drawn up for environments with a pH of 1-4, a concentration of chloride of 1-3% and temperature of 60-80ºC. Interestingly, the behaviour of soldered superduplex steel S32550 was better than austenitic steel S31726, whether soldered or not, for use in washing towers. Also, the use of a product with a nickel base was shown to be more effective than a homogeneous solution when soldering superduplex steel. Finally, the ability of superaustenitic steel to resist corrosion should mean that it could be used in preference to nickel alloys for some applications where no stainless steel has been able to be used previously. In situ studies meant that condensates from the cooling of vapour, produced by the combustion of plastic products, could be collected and analysed. The results showed that they were highly corrosive and confirmed the need for high alloys to be used.

Additional information

Authors: VERNEAU M, Creusot-Loire Industrie (FR);AUDOUARD J P, IRSID (FR)
Bibliographic Reference: EUR 18477 FR (1998) 54pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4716
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