Anodic Protection of Cast Iron in Boiling Sulphuric Acid under Industrial Conditions

Ashby, W. A.; Evans, L.S.; Shepherd, W.

doi:10.1179/000705978798318846

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…38 These pots are used in the concentrations of 70-95% acid at 154 0 C. Corrosion rates up to 35 mm/yr (0.73 in.jyr) have been reported in practice. Anodic protection was applied to these pots (which are 2.5 m in diameter by 2 m deep) after laboratory investigation proved that the corrosion rate could be lowered to 2.5 mm/yr.…”

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confidence: 99%

Anodic Protection of Industrial Equipment

Riggs¹,

Locke

Hamner³

1981

Anodic Protection

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Many methods of corrosion control were first applied in an empirical manner, often many years before the scientific principles underlying the methods were identified. Anodic protection, however, is an exception to this procedure in that an understanding of the basic mechanisms was developed in the laboratory first. These discoveries were followed by a period of pilot-scale development, which included several trial installations in chemical plants. Finally came the commercial development of the technique. This development procedure is very satisfying to the scientist and engineer.Anodic protection is a corrosion-control method with very definite limitations in that the metal-environment system must have anodic-polarization behavior characteristic of active-passive materials. The polarization curve typifying this system and its significance from practical and theoretical vie>vpoints are fully discussed in Chapters 4 and 7. For systems involving activepassive materials, anodic protection can be a successful method of controlling corrosion. The technique has been applied in a wide variety of metal-environment systems, especially during the last 18 years. While most of these applications have been successful, some have not.This chapter is a review of a wide variety of corrosion-control problems to which anodic protection has been applied. Discussion of the equipment involved is given in Chapter 3. Sulfuric Acid ApplicationsSulfuric acid is the chemical manufactured in greatest volume worldwide. Carbon and stainless steels are the most common construction materials for equipment used in the manufacture, storage, and transportation of this commodity which is used in concentrations of 77 to 100% in the United States. Fuming sulfuric acid, or oleum, is also manufactured. Oleum is 100% sulfuric acid in which additional S03 has been dissolved. Anodic protection can be used to control these acids over a wide temperature range. 17 O. L. Riggs Jr. et al., Anodic Protection

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confidence: 99%

Anodic Protection of Industrial Equipment

Riggs¹,

Locke

Hamner³

1981

Anodic Protection

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Entwicklung des Pauling‐Verfahrens zur Regeneration von Abfallschwefelsäure

Plessen

Schalles

1987

Chemie Ingenieur Technik

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Development of the Pauling process for regeneration of spent sulphuric acid. The Pauling rectification process has proved a successful method of regenerating spent sulphuric acid. The further development of the process in the last ten years has included the production of cast iron materials with improved corrosion resistance for use in the boiling vessels. Other development work concerns the operation of the stirrers and the apparatus, the construction of stripping columns, and the introduction of new types of cooling equipment for the hot concentrated sulphuric acid. Furthermore, the scrubbing of the exhaust gases leaving the Pauling apparatus must be adapted to more stringent demands, also with regard to the increasingly varied composition of the spent acids.

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Korrosion von grauem Gußeisen in konzentrierter Schwefelsäure

Plessen

Vogt

1983

Materialwissenschaft Werkst

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Die Beständigkeit von grauem Gußeisen in siedender konzentrierter Schwefelsäure findet im Pauling‐Verfahren zur Regeneration von Abfallschwefelsäure technische Anwendung. Das Korrosionsverhalten des Gußeisens in der siedenden Säure ist abhängig vom Korrosionspotential. Bei hohem Korrosionspotential tritt Passivität des Materials ein. In einer Untersuchung konnte der Einfluß der Legierungsbestandteile Si, Cu und Sn auf die Korrosionsbeständigkeit von Grauguß geklärt werden: Gußeisen, das mehr als 1,4–1,5% Si enthält, zeigt im aktiven Zustand in 97%iger siedender Schwefelsäure ein Korrosionsmaximum. Demgegenüber weist Si‐armer, legierter Grauguß im aktiven Zustand für den ganzen Konzentrationsbereich von 93–98% H2SO4 besseres Korrosionsverhalten auf. Im passiven Zustand des legierten Gußeisens steigt die Korrosionsbeständigkeit mit abnehmendem Si‐Gehalt des Materials und zunehmender H2SO4‐Konzentration an.

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Anodic Protection of Cast Iron in Boiling Sulphuric Acid under Industrial Conditions

Cited by 4 publications

References 4 publications

Anodic Protection of Industrial Equipment

Anodic Protection of Industrial Equipment

Entwicklung des Pauling‐Verfahrens zur Regeneration von Abfallschwefelsäure

Korrosion von grauem Gußeisen in konzentrierter Schwefelsäure

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