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The corrosion behaviour of metals and alloys in hot phosphoric acid

The corrosion behaviour of metals and alloys in hot phosphoric acid The presence of excess quantities of phosphoric acid in a process stream led to severe corrosion in a Type 316L stainless steel T316L S.S. reactor and in associated piping. The pipes were steamjacketed and the reactor was heated with Dowtherm. Laboratory tests, which were carried out using 75 phosphoric acid at temperatures of 200 and 250C, confirmed the high corrosion rates on T316L S.S. and determined the rates for thirtynine other metals and alloys. Copper alloys particularly cupronickels and high nickel alloys particularly Ni28Mo demonstrated much better resistance than T316L S.S, as did the following pure metals platinum, tantalum, molybdenum and silver. Ferrous alloys, zirconium, lead, titanium and aluminium were found to have extremely high corrosion rates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

The corrosion behaviour of metals and alloys in hot phosphoric acid

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0003-5599
DOI
10.1108/eb007292
Publisher site
See Article on Publisher Site

Abstract

The presence of excess quantities of phosphoric acid in a process stream led to severe corrosion in a Type 316L stainless steel T316L S.S. reactor and in associated piping. The pipes were steamjacketed and the reactor was heated with Dowtherm. Laboratory tests, which were carried out using 75 phosphoric acid at temperatures of 200 and 250C, confirmed the high corrosion rates on T316L S.S. and determined the rates for thirtynine other metals and alloys. Copper alloys particularly cupronickels and high nickel alloys particularly Ni28Mo demonstrated much better resistance than T316L S.S, as did the following pure metals platinum, tantalum, molybdenum and silver. Ferrous alloys, zirconium, lead, titanium and aluminium were found to have extremely high corrosion rates.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: May 1, 1991

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