Table 2.
The classification interval table of the soil corrosion index factors.
| Classification model | Soil resistivity (Ω · m) | Reddox potential (mV) | Chloride ion content (%) | Sulfuric acid root ion content (%) | Water content (%) | pH value | Average corrosion rate (g · dm−1 · a−1) |
|---|---|---|---|---|---|---|---|
| J1 | >300 | >500 | <0.01 | <0.009 | <3 | >8.5 | <1 |
| J2 | [60, 300] | [300, 500] | [0.01, 0.075] | [0.009, 0.06] | [3, 8.5) and >35 | [6.25, 8.5] | [1, 4] |
| J3 | [5, 60) | [100, 300) | [0.075, 0.75) | (0.06, 0.65] | [8.5, 12) and [25, 35) | [4.5, 6.25) | (4, 7] |
| J4 | <5 | <100 | >0.75 | >0.65 | [12, 25) | <4.5 | >7 |