Ammonium chloride

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.

Ammonium chloride, NH₄CL
Conc. NH₄CL %	1	1	5	10	10	10	10	20	20	20	50
Temp. °C	20	100	BP	20-50	90-100	BP	135	20-50	90	BP	115
Grade or type of alloy:
Carbon steel			2							2	2
13 Cr	0p	0p	1p	0p	1p	1p	1p	0p	1p	2	2
Alleima® 1802	0p	0p	0p	0p	0p	1p	1p	0p	1p	1p	2
Alleima® 3R12	0p	0ps	0ps	0p	0ps	1ps	1ps	0p	1ps	1ps	2
Alleima® 3R60	0p	0ps	0ps	0p	0ps	0ps	0ps	0p	0ps	1ps	1ps
18Cr13Ni3Mo ¹⁾	0p	0ps	0ps	0p	0ps	0ps	0ps	0p	0ps	1ps	1ps
17Cr14Ni4Mo ²⁾	0p	0ps	0ps	0p	0ps	0ps	0ps	0p	0ps	1ps	1ps
Alleima® 2RK65 ('904L')	0p	0ps	0ps	0p	0ps	0ps	0ps	0p	0ps	0ps	1ps
Sanicro® 28	0ND	0ND	0ND	0ND	0ND	0ND		0ND	0ND	0	0c
254 SMO	0ND	0ND	0ND	0ND	0ND	0ND		0ND	0ND	0	0
654 SMO										0	0
SAF™ 2304	0ND	0ND	0ND	0ND	0ND	0ND		0ND	0ND	0	1p
SAF™ 2205	0ND	0ND	0ND	0ND	0ND	0ND		0ND	0ND	0	0p
SAF™ 2507	0ND	0ND	0ND	0ND	0ND	0ND		0ND	0ND	0	0pc
Titanium (CP Ti)	0	0	0	0	0	0	0p	0	0	0	0

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.