Analysis of Short-Term Steel Corrosion Products Formed in Tropical Marine Environments of Panama
Table 6
Mössbauer relative concentrations (%) for corrosion products after exposure at tests sites for six months and one year.
Exposure time
Type of steel
Exposure site
α-FeOOH (m)1
α-FeOOH (s)2
α-FeOOH Total
γ-FeOOH
γ-Fe2O3 /Fe3O4
β-FeOOH
6 months
A-36
Tocumen
23.6
41.6
65.2
34.8
—
—
Sherman-Open
36.7
35.6
72.3
27.6
—
—
Sherman-Coastal
25.3
41.1
66.4
33.6
—
—
Sherman-Breakwater
38.8
44.7
83.5
16.5
—
—
A-588
Tocumen
38.0
27.7
65.7
34.3
—
—
Sherman-Open
48.4
17.4
65.8
34.2
—
—
Sherman-Coastal
43.3
17.2
60.5
39.5
—
—
Sherman-Breakwater
51.0
28.8
79.8
9.9
10.3
—
COR 420
Tocumen
44.2
15.6
59.8
32.1
8.1
—
Sherman-Open
30.4
12.4
42.8
37.1
20.1
—
Sherman-Coastal
31.6
7.0
38.6
35.2
26.1
—
Sherman-Breakwater
—
21.9
20.5
12.2
65.9
—
Sherman-Breakwater I*
40.0
7.0
47.0
10.9
19.0
23.0
1 year
A-36
Tocumen
43.8
23.0
66.8
33.2
—
—
Sherman-Open
31.3
22.5
53.8
39.5
6.7
—
Sherman-Coastal
46.7
7.5
54.2
37.9
7.9
—
Sherman-Breakwater
20.7
19.3
40
13.6
47.0
—
Sherman-Breakwater I*
—
—
—
3.4
40.7
55.9
A-588
Tocumen
48.3
15.0
63.3
36.7
—
—
Sherman-Open
37.8
16.0
53.8
39.5
6.7
—
Sherman-Coastal
23.6
20.8
44.4
40.6
15.0
—
Sherman-Breakwater
33.5
25.8
59.3
11.6
29.1
—
Sherman-Breakwater I*
—
—
—
—
29.0
71.0
COR 420
Tocumen
32.1
8.9
41.0
37.0
22.0
—
Sherman-Open
21.9
11.6
33.5
37.5
29.0
—
Sherman-Coastal
28.1
14.9
43.0
39.3
17.7
—
Sherman-Breakwater
38.9
11.5
50.4
8.6
41.0
—
*Corrosion product from the inner layer of flaked simple.
1α-FeOOH (m): magnetic goethite (>15 nm) exhibiting magnetic sextet at 298 K.
2α-FeOOH (s): superparamagnetic goethite (<15 nm) exhibiting superparamagnetic doublet at 298 K and magnetic sextet at 80 K.
