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ASM Handbook

Corrosion: Environments and Industries

Edited by
Stephen D. Cramer
Stephen D. Cramer
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Bernard S. Covino, Jr.
Bernard S. Covino, Jr.
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ASM International
Volume
13C
ISBN electronic:
978-1-62708-184-9
Publication date:
2006
Book Chapter

Corrosion by Mixed Acids and Salts

By
Narasi Sridhar
Narasi Sridhar
Southwest Research Institute
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Published:
2006
Page range:
742 - 749
Publication history
October 10, 2006

Abstract

Mixtures of acids or acids and salts are of great importance to the chemical process industry (CPI) for use in digestion of solids, as a promoter in reactions, as a scale remover, and as a complexant. This article emphasizes the assessment of the performance of Ni-Fe-Cr-Mo alloys in mixed acids and salts in an objective manner. It tabulates the nominal compositions of pertinent Ni-Fe-Cr-Mo corrosion-resistant alloys. The article describes the acid and acid-plus-salt mixtures classified into the following general categories: nonoxidizing acid mixtures (H2SO4+H3PO4), nonoxidizing acids with halides (H2SO4+HCl), oxidizing acid mixtures without halides (H2SO4+HNO3), and oxidizing acid mixtures with halides (HNO3+HF). It also illustrates the effect of alloying elements on the corrosion rate in the nonoxidizing mixtures and oxidizing acid mixtures.

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Narasi Sridhar, 2006. "Corrosion by Mixed Acids and Salts", Corrosion: Environments and Industries, Stephen D. Cramer, Bernard S. Covino, Jr.

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