Research Article
Atmospheric Corrosion Behavior of 2A12 Aluminum Alloy in a Tropical Marine Environment
Table 4
Values of the parameters
,
, and
as well as the calculated
.
| | Specimens | Immersion time | (F·cm−2· | n | (Ω·cm2) | (F·cm−2) |
| | Substrate | 0.5 h | 1.43 × 10−4 | 0.846 | 4142 | 1.30 × 10−4 | | 4 h | 1.62 × 10−4 | 0.853 | 3425 | 1.46 × 10−4 | | 8 h | 1.58 × 10−4 | 0.850 | 3489 | 1.42 × 10−4 | | 12 h | 1.79 × 10−4 | 0.880 | 2953 | 1.64 × 10−4 | | 24 h | 2.18 × 10−4 | 0.825 | 2956 | 1.99 × 10−4 | | 48 h | 2.19 × 10−4 | 0.827 | 2216 | 1.88 × 10−4 |
| | 1 month | 0.5 h | 3.1 × 10−6 | 0.772 | 3600 | 8.22 × 10−7 | | 4 h | 2.9 × 10−5 | 0.748 | 4248 | 1.43 × 10−5 | | 8 h | 4.76 × 10−5 | 0.816 | 2239 | 2.87 × 10−5 | | 12 h | 1.05 × 10−4 | 0.784 | 1486 | 6.29 × 10−5 | | 24 h | 9.76 × 10−5 | 0.838 | 1070 | 6.31 × 10−5 | | 48 h | 1.59 × 10−4 | 0.826 | 1867 | 1.23 × 10−4 |
| | 6 months | 0.5 h | 1.17 × 10−5 | 0.689 | 7369 | 3.87 × 10−6 | | 4 h | 2.6 × 10−5 | 0.691 | 3979 | 9.42 × 10−6 | | 8 h | 4.19 × 10−5 | 0.717 | 3800 | 2.03 × 10−5 | | 12 h | 5.12 × 10−5 | 0.742 | 3388 | 2.79 × 10−5 | | 24 h | 5.9 × 10−5 | 0.796 | 2120 | 3.46 × 10−5 | | 48 h | 1.07 × 10−4 | 0.823 | 1801 | 7.51 × 10−5 |
| | 12 months | 0.5 h |
6.9 × 10−6 | 0.579 | 29280 | 2.15 × 10−6 | | 4 h | 9.6 × 10−6 | 0.625 | 17890 | 3.33 × 10−6 | | 8 h | 1.31 × 10−5 | 0.651 | 11240 | 4.68 × 10−6 | | 12 h | 1.33 × 10−5 | 0.749 | 8530 | 6.40 × 10−6 | | 24 h | 1.96 × 10−5 | 0.781 | 7677 | 1.15 × 10−5 | | 48 h | 2.05 × 10−5 | 0.801 | 9099 | 1.35 × 10−5 |
| | 24 months | 0.5 h | 3.7 × 10−6 | 0.571 | 13400 | 3.89 × 10−6 | | 4 h | 7.9 × 10−6 | 0.606 | 10590 | 1.58 × 10−6 | | 8 h | 1.27 × 10−5 | 0.601 | 44720 | 8.72 × 10−6 | | 12 h | 1.3 × 10−5 | 0.626 | 65310 | 1.18 × 10−5 | | 24 h | 1.82 × 10−5 | 0.646 | 25430 | 1.19 × 10−5 | | 48 h | 1.43 × 10−5 | 0.704 | 28600 | 9.81 × 10−6 |
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