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| Content Provider | Springer Nature Link |
|---|---|
| Author | Heakal, Fakiha El Taib Fatayerji, M. Ziad |
| Copyright Year | 2010 |
| Abstract | A systematic study on the corrosion and passivation behavior of AZ91D alloy in relation to the influence of concentration, temperature, pH, and immersion time was made in aqueous sulfate solution using electrochemical techniques including open-circuit potential, potentiodynamic polarization and impedance spectroscopy. It was found that the corrosion and pitting potentials (E corr and E pit) of the alloy drift to more active values with increasing either concentration (0.01–1.0 M) or temperature (278–338 K) of the test solution, suggesting that sulfate solution enhances the alloy dissolution, particularly at higher temperatures. On the other hand, values of the total film resistance (R T) indicate that neutral solution (pH 7.0) supports the formation of a better protective layer on AZ91D surface than alkaline (pH 12.5) or acidic (pH 1.0) medium. The growth of a protective film on the alloy surface at short immersion times (up to ∼50 h) is evinced by a rapid positive evolution of E corr and fast decrease in the corrosion rate (i corr). However, for a long-term exposure (up to 500 h) E corr drifts negatively and i corr increases due to breakdown of the protective film, which causes a decrease in the alloy stability. Fitting the impedance data to equivalent circuit models suitable to each behavior assisted to explore the mechanism for the attack of the sample surface at various testing times. The results obtained from the three studied electrochemical techniques are in good agreement. |
| Starting Page | 125 |
| Ending Page | 138 |
| Page Count | 14 |
| File Format | |
| ISSN | 14328488 |
| Journal | Journal of Solid State Electrochemistry |
| Volume Number | 15 |
| Issue Number | 1 |
| e-ISSN | 14330768 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2010-04-30 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | AZ91D alloy Sulfate Concentration Temperature pH EIS Characterization and Evaluation of Materials Analytical Chemistry Industrial Chemistry/Chemical Engineering Physical Chemistry Electrical Engineering Condensed Matter Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry |
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