Why Derouging/ Pickling?
When stainless steel develops iron oxide due to corrosion, it is known as rouge. This is unacceptable
in many production environments and is removed by a process known as Derouging or Pickling. Derouging is typically carried out using a nitric acid and ammonium bifluoride solution which works
by removing a microscopic layer of stainless steel and anything that is on it – the rouge.
TISL have experience of derouging WFI Systems, Chemical and Process Storage Vessels, Purified
Water Systems, Pure Steam Systems, Buffer Prep Vessels, Aerospace Parts and externals of stainless
steel equipment in Process Rooms.
Prior to derouging, the items should be degreased and afterwards a passivation stage is required to
replenish the Chromium Oxide layer.