Abstract
The corrosion inhibition for aluminium in H2SO4 using Gum Arabic (GA) is reported at 30 - 60°C using weight loss and thermometric techniques. The effect of addition of halides (KCl, KBr and KI) was also investigated. GA acted as an inhibitor for aluminium in H2SO 4 and its inhibition efficiency (%I) increased with concentration of GA. The addition of halides increased the inhibition efficiency (%I) significantly. Increase in temperature caused a decrease in inhibition efficiency (%I) in the absence and presence of GA and halides. GA obeyed the Langmuir, Temkin and Freundlich adsorption isotherms. Phenomenon of physical adsorption is proposed from the values of ΔG°ad and E a obtained. The increase in inhibition efficiency (%I) (and degree of surface coverage, θ) was found to be in the order I- > Br- > Cl- suggesting that the radii and electronegativity of the halide ions play significant role in the adsorption process. The synergism parameter (S1) evaluated is found to be greater than unity indicating that the enhanced inhibition efficiency is only due to synergism.
| Original language | English |
|---|---|
| Pages (from-to) | 74-81 |
| Number of pages | 8 |
| Journal | Transactions of the SAEST (Society for Advancement of Electrochemical Science and Technology) |
| Volume | 41 |
| Issue number | 2 |
| State | Published - Apr 2006 |
| Externally published | Yes |
Keywords
- Adsorption isotherms
- Aluminium
- Corrosion inhibition
- Gum arabic
- Halides
- Synergism
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering