Registration Dossier
Registration Dossier
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EC number: 232-234-6 | CAS number: 7790-94-5
Storage stability and reactivity towards container material
Administrative data
- Endpoint:
- storage stability and reactivity towards container material
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: According to Manual on Tests and Criteria, Part III, sub-section 37.4 and rated according table 2.16.1 of the regulation EC 1272/2008 Annex I
- Deviations:
- no
- GLP compliance:
- no
Test material
- Reference substance name:
- Chlorosulphuric acid
- EC Number:
- 232-234-6
- EC Name:
- Chlorosulphuric acid
- Cas Number:
- 7790-94-5
- Molecular formula:
- ClHO3S
- IUPAC Name:
- sulfurochloridic acid
- Details on test material:
- - Name of test material (as cited in study report): Chlorosulphuric acid
- Analytical purity: no data
Constituent 1
- Specific details on test material used for the study:
- Tested material:
The following materials of construction were tested:
1.
Designation: Al 7075-T6
DIN: -
Chemical composition in weight-%
Zn: 5.6; Cr: 0.23; Mg: 2.5; Cu: 1.6; Al: Balance
2.
Designation: Carbon steel St 37-2
DIN: 1.0037
Chemical composition in weight-%
C: 0.20; Cr: 0.11; Ni: 0.12; Mo: 0.12; Fe: Balance; Others: Al: 0.0016
Test procedure:
Coupons (50x20x2mm and 50x20x4mm) made from Aluminum (type „Al-alloy 7075-T6“) and
Carbon steel (St 37-2) were tested. 2 Coupons were exposed to the liquid phase, 1 coupon to the
interphase of the vapour phase/liquid phase and 1 coupon to the vapour phase of the corrosive.
- Test temperature was 55°C
- Test duration was 7d
- The test tanks were rinsed before demand with nitrogen
- The solutions were stirred.
- The pH-value was checked upon reception and after 7 days.
- The corrosive was not changed.
- Aluminum type „Al-alloy 7075-T6“ and Carbon steel "St 37-2" were tested in separate tanks.
Results and discussion
- Results:
- max. corrosion rate:
0.72 mm/a (Carbon steel type St 37.2)
0.44 mm/a (Aluminium type Al 7075-T6)
Pitting corrosion was not observed.
According to regulation EC 1272/2008 Annex I 2.16 chlorosulphuric acid has not to be classified as corrosive to metals.
Any other information on results incl. tables
|
|
|
|
Corrosion rate in mm/a |
|
||
Corrosive |
Material |
Temp. |
Phase |
0 - 1d |
1 - 3d |
3 - 7d |
Remarks |
Chlorosulphuric acid |
Al-alloy 7075-T6 |
55°C |
L |
0.44 |
0.26 |
0.21 |
uniform corrosion |
|
|
L/V |
0.20 |
0.13 |
0.11 |
as above |
|
|
|
V |
0.19 |
0.04 |
0.07 |
mat, etching, stains, ok. |
|
|
|
|
|
Corrosion rate in mm/a |
|
||
Corrosive |
Material |
Temp. |
Phase |
0 - 1d |
1 - 4d |
4 - 7d |
Remarks |
Chlorosulphuric acid |
Carbon Steel St 37-2 |
55°C |
L |
0.72 |
0.18 |
0.15 |
uniform corrosion |
|
|
L/V |
0.57 |
0.17 |
0.12 |
as above, brown deposits |
|
|
|
V |
0.25 |
0.17 |
0.11 |
as above |
|
Legend
L = Liquid Phase L/V = Interphase V = Vapour Phase
Corrosive |
Time (d)
|
Temp. [°C] |
Material of construction |
Corrosion rate [mm/a] |
Results
|
Sulfuryl chloride |
7 |
55 |
Carbon steel [type: St 37-2]
|
0.72 |
resistant |
Aluminium [type: Al 7075-T6] |
0.44 |
resistant |
pH-Value <1 (tq.)
Applicant's summary and conclusion
- Conclusions:
- According to regulation EC 1272/2008 Annex I 2.16 chlorosulphuric acid has not to be classified as corrosive to metals.
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