Phosphate corrosion in high-pressure boilers
Journal Article
·
· Materials Performance
OSTI ID:136982
- Nalco Chemical Co., Naperville, IL (United States)
As operating pressures have increased, the frequency of corrosion-related failures in phosphate-treated boilers has also increased. Congruent phosphate control was derived to prevent the formation of free caustic by feeding orthophosphates to maintain a boiler water sodium-to-phosphate ratio at which theory surmised free caustic could not form. Unfortunately, conventional congruent control did not take into account the interaction of phosphate compounds with deposits and corrosion products, including iron oxides on boiler tube surfaces, and corrosion continued. Phosphate corrosion is the name given to attack involving phosphate compounds having unique wastage morphologies and associated corrosion products and deposits.
- OSTI ID:
- 136982
- Journal Information:
- Materials Performance, Journal Name: Materials Performance Journal Issue: 12 Vol. 34; ISSN 0094-1492; ISSN MTPFBI
- Country of Publication:
- United States
- Language:
- English
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