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Corrodkote Test

Last updated: August 6, 2020

What Does Corrodkote Test Mean?

The Corrodkote test is an accelerated test used for determining plating corrosion resistance of electrodeposits. It is performed by putting Corrodkote mud as well as a dried specimen under testing within a moist chamber.


Corrosionpedia Explains Corrodkote Test

The Corrodkote test is primarily performed for testing corrosion resistance of materials like anodized aluminum. This test provides a faster indication of resistance to corrosion and an improved correlation with performance.

In this test, the Corrodkote mud is made by combining:

  • 7ml of copper nitrate at 5g per L
  • 33ml of ferric chloride at 5g per L
  • 10 ml of ammonium chloride at 100g per L
  • 30g of Kaolin clay

The test speciments are covered with the Corrodkote mud, which is then applied to the sample surface and left to dry. Once dry, the samples are subjected to a controlled environment of 80-90% RH and over 38°C. The test specimen is then set aside for at least one cycle or over a period of 16 hours. To achieve further cycles, the test samples are replenished and fresh Corrodkote mud is applied.

The Corrodkote test is used to evaluate the corrosion performance of chromium/nickel and chromium/nickel/copper coatings that are electrodeposited on:

  • Steel
  • Aluminum alloys
  • Zinc alloys
  • Plastics
  • Other substrates

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