01685 812765     sales@mpelimited.co.uk

Pickling of Austenitic and Duplex Stainless Steel

On site pickling of stainless steelPickling is a surface treatment process to remove scaling, thermal oxides, impurities and surface contaminant.  The process is carried out by immersion in a pickling solution  Willowchem 81) for a calculated time, based on surface area and material specification.

The Pickling process is often used after processes such as welding and annealing.  The process incorporates a pickling solution made up from a carefully calculated mix of Nitric acid and Hydroflouric  acid.  The solution, if correctly formulated, will remove thermal oxides and surface contaminants, as well as leaving the remaining clean surface as passive.

The pickling process will conform to ASTM A380

Benefits of Pickling:

  • Dissolves thermal oxides after welding, annealing etc.
  • Provides a chemically clean, uniform finish.
  • Removes surface contaminants.
  • Passivate the surface as well as chemically cleaning.

Pickled weld

 Pickled stainless steel pipes

Below: On-site pickling and passivation - before and after

On-site - Stainless steel passivation - beforeOn-site - Stainless steel passivation - before


Get in touch today and one of our knowledgeable staff will be delighted to be of assistance.

Contact Us

MPE Limited
Unit 6/ 7 Hirwaun Industrial Estate
Hirwaun, Mid Glamorgan, CF44 9UP

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Tel: 01685 812765

About MPE Limited

Inspection & quality procedures have always been of the highest priority at MPE. Certified to ISO9001:2015, MPE are successful in attaining the high standards demanded for these quality systems to operate successfully. 

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Our Services

Mechanical Polishing, Electropolishing, Pickling, Bead Blasting, Degreasing & Passivation of Stainless Steel Fabrications & Assemblies form the basis of the key specialist services that are undertaken by MPE Limited.