Why and How to Chemically Neutralise Metal


Once metals have been degreased, cleaned, shot blasted or stripped, chemical neutralisation is needed for several reasons:

  • To ensure no possible contamination of further processes.
    • Our Passivate TSN ensures that ferrous and non-ferrous metal surfaces are ready for further processing without any unwanted influence from previous treatments.
  • For environmental protection.
    • Acidic or alkaline solutions can be harmful to the environment if released without neutralization. Neutralizing these solutions helps to prevent the release of hazardous materials into the environment, reducing the risk of pollution.
  • Safety
    • Some metal treatments produce by-products that are corrosive or otherwise hazardous. Neutralizing these by-products reduces the risk of accidents or injuries to anyone handling the treated materials or waste products.
  • To comply with regulations.
    • Environmental agencies often require neutralisation before disposal. By easily complying to this you avoid fines or other penalties.
  • To prevent corrosion.
    • If metals are not properly neutralized after treatment, residual substances can remain on the surface, leading to corrosion over time. Neutralizing these substances helps to protect the metal and extend its lifespan.



Whatever the plan for your treated metal, we recommend neutralisation with Passivate TSN to ensure safe and easy further procedures. Passivate TSN is a liquid product, suitable for use with all types of ferrous and non-ferrous metals. It has neutralising and degreasing properties, therefore passivating the metal surface by creating a thin inert layer, making it un-reactive.



Passivate TSN is used at very low concentrations with only a of 2-10% concentration required, ideally in a dip tank, depending on the material treated. Metal items should be immersed in Passivate TSN solution for 2 minutes before being rinsed and allowed to dry before further treatment. If required, the treatment tank can be heated to around 50oC, however an ambient will suffice for many applications.


Passivate TSN is non-flammable and pH neutral, so precautions are minimal when using. After treatment, the metal should always be dried with pressurised or heated air.


If you have any questions on how or why the neutralisation of metals is needed with the use of our Passivate TSN, please contact us for further advice, or see our FAQs page to see if your question is already answered.