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Chemical pickling and passivation

 

Why chemical pickling ?

The corrosion restistance of stainless steel rests on the formation of a very thin chromium oxide rich passive layer which only develops on metallic clean stainless steel surfaces.

Scale layers, welding colours and tarnish, ferritic impurities (e.g. abrasion), mechanical treatments (e.g. grinding, blasting etc.) inhibit the formation of a closed passive layer.

Only fully controlled pickled stainless steel surfaces and weld seams therefore guaran-tee full corrosion resistance of the material and in addition offer a decorative metallic appearance.

Tube with weld seam and annealing colour

Weld seam after chemical pickling

Chemical pickling - how is it done ?

 

Chemical pickling processes

Technical procedure

Depending on the requirements and the size of the workpiece the components to be pickled are immersed into pickling baths or the pickling medium is sprayed on the metal surface and rinsed off with conditioned (demineralized) water and passivated.

Chemicals

The pickling chemicals consist of acid mixtures effecting chemical removal on the top material layers in a range of 1-3 µm.
Block hinzufügen

 

Werkstoffe

High-alloyed ferrous alloys, copper and copper alloys, nickel and nickel alloys, titanium and titanium alloys, niobium and niobium alloys

 

Our services

  • Treatment of components of all sizes (pickling baths up to 60.000 ltr.)
  • Materials 1.4301, 1.4571, 1.4404, 1.4435, 1.4539, Hastelloy®, etc.
  • Treatment documentation
  • On-site pickling operations (also circulation flushing)
  • Development and supply of chemicals for pickling and passivation
  • Supply of pickling lines and spray pickling equiment

 

 

Technical data | Technical reports

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