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Diss Factsheets

Physical & Chemical properties

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:
key study
Study period:
2011
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Report date:
2011

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Test Methods and Criteria Relating to Substances of Class 8, Test C.1.
Principles of method if other than guideline:
Test coupons

The metal coupons used in this study were supplied by European Corrosion Supplies Ltd, Kidderminster,
(a) Aluminium - Type 7075 – T6, 50 x 25 x 1.6mm, 5mm diameter suspension hole.
(b) Steel - Type S275J2G3, 50 x 25 x 3mm, 5mm diameter suspension hole.

The test method suggests coupon sizes of 50 x 20 x 2mm and calculates weight loss limits of 13.5, 26.5, 39.2 and 51.5% for 7, 14, 21 and 28 days exposure based on a corrosion rate of 6.25 mm/year. The coupons available were of a slightly different size so the 6.25 mm/year corrosion rate gives different weight losses for the same exposure times.
Type of method:
other:

Test material

Specific details on test material used for the study:
Approximately 1 litre of Perform CC was charged to a 2 litre jacketed glass vessel fitted with reflux condenser and heated using an external Haake oil heater/circulator. Three pre-weighed test coupons were suspended by PTFE tape such that one was fully immersed in the liquid, one half-immersed and the other suspended in the vapour space above the liquid surface. Separate tests were run for aluminium and steel coupons. The vessel was heated at 55°C (oil bath set point 56.5°C) for 7 days, after which the coupons were washed, all loose deposits removed with a plastic brush, cleaned with acetone, dried and re-weighed.

Results and discussion

Any other information on results incl. tables

Aluminium 7075-T6 (50 x 25 x 1.6mm)

Coupon

#183 Fully immersed

#182 Half immersed

#181 Vapour phase

Appearance after 7 days

Mottled dull, dark grey

staining.

 

Immersed half as coupon

#183. Prominent band of

dull, dark staining at

liquid/air interface.

Exposed half stained

where splashed with

liquor.

Dark staining where

splashed with liquor.

Otherwise bright and

shiny.

Initial weight (g)

5.5052

5.4647

5.5065

Final weight (g)

5.5042

5.4640

5.5065

Weight loss (mg)

1.0

0.7

0.0

Weight loss (%)

0.02

0.01

0.00

Corrosion rate (mil/year)

2.7

1.9

0.0

Corrosion rate (μ/year)

6.8

4.8

0.0

Corrosion rate (mm/year)

0.01

<0.01

0.00

Steel S275J2G3 (50 x 25 x 3mm)

Coupon

#10 Fully immersed

#07 Half immersed

#04 Vapour phase

Appearance after 7 days

Small amount of surface

deposit. Light pitting.

Dull, dark grey

colouration with feint light

brown rust-like stains

Immersed half as coupon

#10. Exposed half

showed dark brown rustlike

stains where

splashed with liquor.

As exposed half of

coupon #07. Stains feel

rough to the touch

compared to unstained

Initial weight (g)

28.5308

28.4180

28.4790

Final weight (g)

27.7714

28.1188

28.4791

Weight loss (mg)

759.4

299.2

-0.1

Weight loss (%)

2.66

1.05

0.00

Corrosion rate (mil/year)

671

265

0

Corrosion rate (μ/year)

1705

672

0

Corrosion rate (mm/year)

1.71

0.67

0.00

Applicant's summary and conclusion

Conclusions:
Perform CC: Aluminium coupons exhibited minimal corrosion equivalent to a maximum of only 0.01 mm/year in the fully immersed coupon. Some dark staining was evident, particularly at the air/liquid interface on the partially immersed coupon, and on surfaces in the vapour phase that became splashed with liquor owing to condensed water vapour dripping from the condenser into the test solution. There was no other visible evidence of corrosion.

Areas of the steel coupons that were directly exposed to Perform CC showed significant corrosion including light pitting. However, the measured corrosion rate of 1.71 mm/year on the fully immersed coupon was well within the 6.25 mm/year threshold specified by the test protocol. The liquor exhibited a red-brown bloom close to immersed coupon surfaces within fifteen minutes of starting the test, and was almost opaque deep red-brown in colour after three days.