Passivation of Stainless Steel

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    What is Passivation of Stainless Steel?

    Stainless Steel is protected against corrosion by a naturally forming passive layer – the Chromium Oxide layer. If this is disrupted, by cutting, welding, heating, grinding or through contact with chemicals, the stainless steel loses its protection against corrosion. The passive layer, or Chromium Oxide layer, can be restored by a process known as passivation. Passivation is achieved by contact of the stainless steel with a strong oxidizing agent (nitric acid) or a chelating agent (citric acid). Transflow Industrial Services Limited (TISL) have over a quarter of a century of experience in passivation with both nitric and citric acid in the UK and overseas on a wide variety of equipment in accordance with ASTM A380, A967 and BSEN 2516. WFI Systems, Purified Water System, Product Transfer and Manufacture and Clean Steam Systems each have unique designs which require consideration when passivating.

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    Our Passivation services allows you to restore corroded stainless still through the use of citric and nitric acid.


    Degreasing of Components, Pipes, Fabrications and Systems is necessary to remove mineral oils, greases and debris adhered to product contact surfaces. This can stop the potential risk of explosion in pipes and oxygen service equipment.


    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. View our specialist Derouging service.

    Chemical  Descaling

    Chemical Descaling is necessary to remove water hardness scale or limescale from heat exchange equipment such as boilers, heat exchangers, calorifiers, tube bundles, autoclave jackets, water systems and cooling towers.

    Pre-commission Flushing

    It is important for the operation of water systems after commissioning that they are cleaned and treated properly at pre-commission stage. TISL are able to offer flushing in accordance with BSRIA Guidelines throughout the UK and have experience of flushing systems up to 30m3 in volume.

    Ribflavin Testing

    TISL are able to carry out on-site testing of sprayballs within your facility to ensure full coverage of vessel internals. With many new and re-purposed vessels having commissioning manuals missing or incomplete, evidence of the effectiveness of sprayballs at wetting surfaces is sometimes missing.

    TISL personnel are highly trained, courteous and competent and we ensure all personnel undergo
    regular training appropriate to their roles. This includes:

    • CCNSG Safety Passport  
    • COSHH Training 
    • Working at Height 
    • ADR Chemical Transportation Licences
    • Manual Handling    
    • Confined Space Access 
    • Face Fit Testing for Respirators 
    • Job Specific Chemicals Services Training 
    • Ferroxyl Testing of Welds  
    • St Johns Ambulance First Aid Training   


    ThermoFisher Scientific
    Reckitt Benckiser
    Porton Biopharma
    3M Health Care
    Boehringer Ingelheim

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