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If surfaces are heavily pitted (i.e. >1000 µm) it is possible that soluble salts will
be retained within the pits. If so, following the qualitative Potassium
Ferricyanide test (BS 5493- Appendix G) would aid interpretation on carbon
steel and low alloy steel surfaces. This test will only work on ferritic steel
surfaces.
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18
16
14
12
10
8
6
4
2
0
2
Figure 5. Readings obtained at Various Temperatures
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6
8
10
12
4
ACTUAL SALT LEVEL
(µg cm -2 )
with Sodium Chloride
35° C
25° C
15° C
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16
18
20
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