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Administrative data

Endpoint:
other: corrosive to metals
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30 October 2015-08 December 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP-compliant study in accordance with UN-MTC 37.4 (Test C.1).

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: UN no. ST/SG/AC.10/11/Rev.5: Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, Part III Section 37.4 “Test Methods for Corrosion to metals" (2009)
Principles of method if other than guideline:
UN MTC Section 37.4.1.1 -Test C.1 "Test for determining the corrosive properties of liquids and solids that may become liquid during transport as dangerous goods of Class 8, packing group III"
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Tetrabutylphosphonium bromide
EC Number:
221-487-8
EC Name:
Tetrabutylphosphonium bromide
Cas Number:
3115-68-2
Molecular formula:
C16H36P.Br
IUPAC Name:
tetrabutylphosphonium bromide
Test material form:
other: crystallized solid
Details on test material:
- Name of test material (as cited in study report): Tetrabutylphosphonium Bromide; CYPHOS® 442 Phosphonium Salt
- Physical state: Light orange crystallized solid
- Storage condition of test material: At room temperature, container flushed with nitrogen
- Other: hygroscopic

Results and discussion

Results:
Uniform corrosion
-The weight loss of the aluminum and steel plates was < 13.5% (i.e. equivalent to < 6.25 mm/year corrosion rate); according to the guidelines, the test for uniform corrosion was negative.
-Although minimal weight losses of the metals was obtained it was visually observed that the metal plates reacted due to contact with the test item. With the aluminium plates a dark grey residue on the plates was observed. With the steel plates a brown residue was observed on the plates and on the bottom of the glass receptacles.

Localized corrosion
-The mean depth of the deepest hole of the aluminium plate was > 120 µm. According to the guidelines, the test for localized corrosion on aluminium was positive.
-Localized corrosion was observed on one aluminium and one steel plate (specimen 2). The depth of the deepest hole obtained with specimen 2 was measured in ten-fold using a Surface Profile Gauge (PCWI International, Cardiff, Australia).


Any other information on results incl. tables

Table: Uniform corrosion - weight loss of aluminum plates

 

 

Specimen 1
[g]

Specimen 2
[g]

Specimen 3
[g]

Reference plate
[g]

 

 

 

 

 

Weight of the plate at the start of the test

5.4719

5.3969

5.4797

-

 

 

 

 

 

Weight of the plate at the end of the test after removal of corrosion products using pickling solution

5.4581

5.3865

5.4783

-

 

 

 

 

 

Weight of the reference plate before treatment pickling solution

-

-

-

5.4130

 

 

 

 

 

Weight of the reference plate after treatment pickling solution

-

-

-

5.4111

 

 

 

 

 

Weight loss [%]

0.22

0.16

-0.01

-

 

Table: Uniform corrosion - weight loss of steel plates

 

 

Specimen 1
[g]

Specimen 2
[g]

Specimen 3
[g]

Reference plate
[g]

 

 

 

 

 

Weight of the plate at the start of the test

15.0927

15.1506

15.0830

-

 

 

 

 

 

Weight of the plate at the end of the test after removal of corrosion products using pickling solution

15.0290

15.0371

15.0685

-

 

 

 

 

 

Weight of the reference plate before treatment pickling solution

-

-

-

14.8535

 

 

 

 

 

Weight of the reference plate after treatment pickling solution

-

-

-

14.8511

 

 

 

 

 

Weight loss [%]

0.41

0.73

0.08

-

 

Table: Localized corrosiondepth of the deepest hole of aluminium plates (specimen 2)

 

Depth [μm]

Mean depth [μm]

Coefficient of variation [%]

 

 

 

137

134

3.2

131

 

 

130

 

 

134

 

 

136

 

 

131

 

 

135

 

 

144

 

 

132

 

 

130

 

 

 

Table:Localized corrosiondepth of the deepest hole of steel plates (specimen 2)

 

Depth [μm]

Mean depth [μm]

Coefficient of variation [%]

 

 

 

53

63

12.9

58

 

 

63

 

 

51

 

 

57

 

 

74

 

 

69

 

 

64

 

 

73

 

 

69

 

 

 

 

 

Applicant's summary and conclusion

Conclusions:
Because localized corrosion was observed with the aluminium plate placed in the half in/half above the test solution with the depth of the deepest hole was ≥ 120 µm, the test substance is considered to be corrosive to aluminium to the criterion for localized corrosion.

Executive summary:

The corrosion to metals was determined at 55°C and a 7-day test period using 2 mm aluminium and steel plates in a GLP-compliant study performed in accordance with UN-MTC Section 37.4 (Test C.1). The solid test substance was dissolved in water; the test concentration was 1 g/L.

-All weight losses were < 13.5% (i.e. equivalent to 6.25 mm/year corrosion rate).

-Localized corrosion was observed with the aluminium plate placed in the half in/half above the test solution. The depth of the deepest hole was ≥ 120 µm.

The test substance is considered to be corrosive to aluminium to the criterion for localized corrosion. Based on this, the substance was CLP classified as 'corrosive to metals'.

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