Galvanic Corrosion of Steel in Agitated Vessels Used in Fertilizer Industry
| Autor: | Mohamed Helmy Abdel-Aziz, B. A. Amer, E.-S. Z. El-Ashtoukhy, N. K. Amin |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope General Chemical Engineering 0211 other engineering and technologies 02 engineering and technology General Chemistry Electrolyte Cathode law.invention Corrosion Anode Galvanic corrosion Corrosion inhibitor chemistry.chemical_compound Impeller 020401 chemical engineering chemistry law 0204 chemical engineering Composite material 021102 mining & metallurgy |
| Zdroj: | Theoretical Foundations of Chemical Engineering. 53:280-291 |
| ISSN: | 1608-3431 0040-5795 |
| DOI: | 10.1134/s0040579519020015 |
| Popis: | Rates of mass transfer controlled Fe/Cu galvanic corrosion at the wall lining of a cylindrical agitated vessel in different fertilizer electrolytic media were studied. Variables investigated are impeller rotation speed, impeller geometry, electrolyte type, electrolyte concentration, area ratio (anode/cathode), electrolyte temperature, and effect of polyethylene oxide (drag reducing polymer) as a corrosion inhibitor. The corrosion rate was determined by following the change of the concentration of anode metal ions (Fe++) in the electrolyte with time. Scanning electron microscopy (SEM) was carried out for steel sheets subjected to different electrolytes. The results showed that the galvanic corrosion rate increased with increasing the impeller rotation speed, the electrolyte concentration, and temperature. The presence of polyethylene oxide decreased the rate of corrosion by 11–35.21% depending on polymer concentration and operating conditions. Axial flow impeller produces corrosion rates higher than that with the radial flow type under the same operating parameters. Application of the results in the design of agitated vessels handling fertilizer media was discussed. |
| Databáze: | OpenAIRE |
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