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Physical & Chemical properties

Storage stability and reactivity towards container material

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Reference
Endpoint:
storage stability and reactivity towards container material
Type of information:
experimental study
Adequacy of study:
key study
Study period:
November 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study, according to UN recommendations, certificate of analysis included.
Qualifier:
according to guideline
Guideline:
other: Recommendations on the transport of dangerous goods, Manual of tests and criteria, United Nations, New York and Geneva, Rev.5, 2009.
Deviations:
no
GLP compliance:
no
Type of method:
other: the uniform and pitting corrosion
Results:
Carbon steel SAE 1020
The corrosion rates of SAE 1020 in the liquid phase are above the corrosion threshold of 6.25 mm/year in p-TSC

Aluminium 7075 T6
The corrosion rates of Aluminium 7075 T6 in the liquid phase are above the corrosion threshold of 6.25 mm/year in p-TSC.
The maximum intrusion depth of the pits, exposed in the vapour phase is <120 µm.

An overview of the results is given for C-Steel and Aluminium in tables below.

Corrosion rates and observations after the exposition test of C-Steel SAE 1020

PTSC

Phase

Mass­

t=0

(g)

Mass

t=end

(g)

Mass

difference

(mg)

C-steel

SAE 1020

Average

corrosion rate

[mm/year]

C-steel

SAE 1020

 

Mass loss

[%]

Observations

Vapor

14.9503

14.5301

420

1.4

2.8

Surface, light brown coloring

Vapor/Liquid

14.6521

11.8417

2810

9.2

19

Surface, dark brown coloring

Liquid

14.7096

1.3892

13320

44

91

Surface, dark brown coloring

                       

Corrosion rates and observations after the exposition tests of aluminum 7075 T6 

PTSC

Phase

Mass­

t=0

(g)

Mass

t=end

(g)

Mass

difference

(mg)

Aluminium 7075

Average

corrosion rate

[mm/year]

Aluminium 7075

Average

Mass loss

[%]

Observations

Vapor

5.0393

5.0230

16

0.2

0.3

White, yellow colouring, pitting

Vapor/Liquid

5.0649

2.6024

2463

23

49

White, yellow colouring, pitting in the vapour phase.

Liquid

5.0291

0.0000

5029

47

100

 Dissolved

  

The corrosion form is uniform, except the coupon exposed in the vapor/liquid phase, this contains pitting in the vapour part. The minimum intrusion depth of aluminum is lower than the given threshold 120μm.

 

Conclusions:
According to the criteria in the UN Standard mentioned above aqueous p-TSC should be classified as corrosive.

Description of key information

According to the criteria in the UN Standard aqueous p-TSC should be classified as corrosive.

Additional information