Corrosion inhibition effect of calcium gluconate on mild steel in artificial seawater
| Autor: | M. A. Fajobi, Oluleke Oluwole, Cleophas Akintoye Loto, Roland Tolulope Loto |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
corrosion General Computer Science Chemistry 020209 energy General Chemical Engineering General Engineering technology industry and agriculture chemistry.chemical_element Artificial seawater 02 engineering and technology Calcium Engineering (General). Civil engineering (General) Corrosion inhibitor 020901 industrial engineering & automation calcium gluconate 0202 electrical engineering electronic engineering information engineering steel TA1-2040 Inhibitory effect Nuclear chemistry |
| Zdroj: | Cogent Engineering, Vol 7, Iss 1 (2020) |
| ISSN: | 2331-1916 |
| Popis: | The corrosion inhibition effect of non-toxic calcium gluconate at 0.75%, 1.25%, 1.75% and 2.25% concentration on mild steel in artificial seawater (3.5% NaCl) was studied by potentiodynamic polarization, coupon measurement, optical microscopy characterization and open circuit potential measurement. Results obtained showed the inhibiting compound effectively suppressed the corrosion of mild steel with inhibition efficiency value generally above 80% from polarization test and 90% from coupon measurement after 0.75% concentration of calcium gluconate. Calcium gluconate exhibited mixed type inhibition property with dominant anodic inhibition effect. The inhibitor adsorbed onto the steel surface through physisorption mechanism according to Langmuir and Frumkin isotherm models. Calcium gluconate shifted open circuit corrosion potential plot of mild steel to electropositive values compared to the plot of the non-inhibited steel. Corrosion pits in addition to severe worn out morphology on the image of the non-inhibited steel were absent on the inhibited steel with relatively improved surface morphology. |
| Databáze: | OpenAIRE |
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