|
 Aerographic Test Procedure
Following is a n international accelerated comparative corrosion test under sever conditions which can used to infer and/or compare corrosion protection ability of Aerographic's VCI wrappers versus blank piece/other VCI existing method of protection.
Equipments
Two glass jars (with wide mouth) with tight lids. Nylon thread. Two M.S. plates of dimensions 5 cm x 4 cm x 0.2 cm (or any identical small piece of metal part) should be well ground and corrosion free. VCI paper. Beaker, funnel and temperature controlled electric oven range 400C to 800C
Procedure
- Take two jars.
- Draw a fresh VCI paper sample just before the test from a roll (dispose top 1-2 layer fro the roll and draw a sample.
- Cover the test piece (metal piece) with adequate layer of VCI paper.
- Take 30 ml tap water in a clean beaker. Pour this water into a jar with the help of funnel in both the jar.
- The VCI covered plate sample and blank plate sample are tied with the nylon thread and hung in both jars respectively (Do not use the cello tape to cover
- the paper). Care is taken that they are not in contact with water or the sides of the jar. Refer the fig.
- Seal the jar with adhesive tape. This is very essential. Otherwise test may fail (as major active chemicals at elevated temperature may escape).
- Keep the two jars an inside oven for 8 hrs at 600C (Maximum)
- After 8 hrs turn off the oven and allow the jars to cool down for 16 hrs to results in condensation of vapors.
- This cycle is of 24 hrs repeated 3 times.
- Check the seal of the jar is intact after every cycle otherwise cycle the test will have to repeat.
- After three cycles remove the seal of jars and compare the corrosion on two plates subjected to SERVE the conditions in the two jars.
Note: This is a comparative test where one has to compare the corrosion on the bare plate or packed in the traditional way VCI protected plate at extremely elevated conditions.
Preparation for corrosion free test plates
The test plates are dipped in white spirit to remove the majority of oil and grease stains on the metal surface. The test plates are kept in boiling white spirit (analytical grade). The test plates are washed with hot methanol (analytical grade). The test plates polished with aluminum oxide cloth. The dust is removed with surgical gauze until the gauze does not get darkened. The plates are stored in desiccators not more than one day.
|
