These corrosion data are mainly based on results of general corrosion laboratory tests, carried out with pure chemicals and water solutions nearly saturated with air (the corrosion rate can be quite different if the solution is free from oxygen).

All concentrations are given in weight-% and the solvent is water if nothing else is shown. The corrosion data apply to annealed materials with normal microstructure and clean surfaces, throughout.

Oxalic acid, (COOH)2
Conc. %
Temp. °C20356080100=BP3560100=BP20406080100=BP203560
Grade or type of alloy:
Carbon steel1122222212222122
13 Cr1112212212222122
Alleima® 18020001200200012000
Alleima® 3R120001200200012001
Alleima® 3R600000200200002000
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L')0000000000000000
Sanicro® 280000100100001000
254 SMO0000100100001000
654 SMO0000000000001000
SAF™ 23040000100100002000
SAF™ 22050000100100001000
SAF™ 25070000000100001000
SAF™ 2707 HD00
SAF™ 290600
SAF™ 3207 HD00
Titanium (CP Ti)0022202200222012

1) ASTM 317L, e.g. Alleima® 3R64
2) EN 1.4439, e.g. Alleima® 3R68

Oxalic acid, (COOH)2
Conc. %551010101010252525404050
Temp. °C85100=BP25506080101=BP6075103=BP75106=BP107=BP
Grade or type of alloy:
Carbon steel2222222222222
13 Cr2222222222222
Alleima® 18021200122222222
Alleima® 3R121200122222222
Alleima® 3R601100012012122
18Cr13Ni3Mo 1)
17Cr14Ni4Mo 2)
Alleima® 2RK65 ('904L')0100001001011
Sanicro® 280100001001011
254 SMO0100001001011
654 SMO0100001001011
SAF™ 23040200012012121
SAF™ 22050100002002022
SAF™ 25070100001002022
SAF™ 2707 HD00000
SAF™ 290600111
SAF™ 3207 HD00000
Titanium (CP Ti)2212222222222

1) ASTM 317L, e.g. Alleima® 3R64
2) EN 1.4439, e.g. Alleima® 3R68

Symbol clarification

These corrosion tables use a number of symbols, having the following meanings:

Symbol Description
0 Corrosion rate less than 0.1 mm/year. The material is corrosion proof.
1 Corrosion rate 0.1—1.0 mm/year. The material is not corrosion proof, but useful in certain cases.
2 Corrosion rate over 1.0 mm/year. Serious corrosion. The material is not usable.
p, P Risk (severe risk) of pitting and crevice corrosion.
c, C Risk (Severe risk) of crevice corrosion. Used when there is a risk of localised corrosion only if crevices are present. Under more severe conditions, when there is also a risk of pitting corrosion, the symbols p or P are used instead.
s, S Risk (Severe risk) of stress corrosion cracking.
ig Risk of intergranular corrosion.
BP Boiling solution.
ND No data. (Used only where there are no actual data to estimate the risk of localised corrosion instead of p or s).

Disclaimer: Laboratory tests are not strictly comparable with actual service conditions. Accordingly, Alleima makes no warranties, express or implied, and accept no liability, compensatory or consequential, for the performance of different materials in individual applications that may be based on the information provided in this publication.