The corrosion-resistance of stainless steels towards citrus fruit-squash concentrates and towards citric acid-sugar-common salt-sulphur dioxide solutions
✍ Scribed by J. M. Bryan; J. W. Selby
- Publisher
- John Wiley and Sons
- Year
- 1951
- Tongue
- English
- Weight
- 409 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Abstract
This research was undertaken to determine the relative suitability of a range of Austenitic stainless steels for use in equipment for handling hot citrus fruit concentrates containing sulphur dioxide. The work was carried out as two parallel investigations in separate Laboratories using, as corroding agents, in one Laboratory a hot solution of citric acid, sugar, common salt and sulphur dioxide, and in the other, natural citrus fruit concentrates containing sulphur dioxide.
It is shown that the steels which contained from 2% to 3% of molybdenum were much more resistant to both these agents than were similar steels which did not contain this element. It is reasonable to suppose that the molybdenum‐bearing steels would give satisfactory service in the citrus juice industry, and this opinion has been confirmed by further tests under factory conditions.
It is noted that the use of welding in the fabrication of stainless‐steel equipment frequently causes a lowering of the corrosion‐resistance of the steel in the welded region. This applies to some extent even with the molybdenum‐bearing steels.