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TEMPERATURE EFFECT ON PIT DEPTH AND MORPHOLOGY OF ALUMINUM ALLOY AISI 1080, IN THE RANGE (293-353)K, AT 0.5N NACL SOLUTION | ||
| AL-TAQANI | ||
| Article 1, Volume 23, Issue 1, 2010, Pages 185-191 | ||
| Author | ||
| Abstract | ||
| Aluminum alloy type AISI 1080 was tested in 0.5N NaCl solution, using simple immersion test for 120 hr., at temperatures 293K, 313K, 323K, and 353k respectively. After immersion test the maximum pit depth was calculated at each test temperature. The results show that pit depth increases as the temperature of the solution increases. The pit depth tend to increase rapidly starting from 293K (pit depth of 3 micron) up to 12 micron at 333K ,then steadily raise up to 15 micron at 353k. This may be related to temperature rise that causes change in oxide hydration also this temperature rise affect chloride ion absorption in the passive layer. Corrosion rate in Mil Per Year (MPY) was also tested for the same alloy at the same solution concentration and temperatures. Results indicate corrosion rate decrease as the temperature increases. This is attributed to the increase in chemical reaction rate as the temperature rise, also it affect pit growth and nucleation. According to MPY results alloy AISI 1080 have excellent general corrosion resistance. Scanning Electron Microscope (SEM) was also used to study the attacked alloy surfaces after immersion, in 0.5 NaCl solution at the above temperatures. Results reviled crystallographic nature of the attacked alloy surface. | ||
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