Sodium hydroxide + sodium sulphide

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.

Symbol clarification

Sodium hydroxide, NaOH + sodium sulphide, Na2S
Conc. NaOH % 2.5 65
Conc. Na2S% 1 10
Temp. °C BP 165
Grade or type of alloy:
Carbon steel 2
13 Cr 0 2
Sandvik 1802 0 2
Sandvik 3R12 0 2
Sandvik 3R60 0 2
18Cr13Ni3Mo 1)
0 2
17Cr14Ni4Mo 2)
0 2
Sandvik 2RK65 ('904L') 0 1s
Sanicro 28
254 SMO
654 SMO
Sandvik SAF 2304
Sandvik SAF 2205
Sandvik SAF 2507
Titanium (CP Ti) 0 2

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

Symbol clarification

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

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).

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