Etching and Passivation

Etching and passivation of non-ferrous metals




Etching is a method of cleaning metal surfaces from corrosion products by removing them from the substrate in pickling baths. In practice, the products most often subjected to etching are made of steel (iron alloys), stainless steel and copper brass, whose corrosion products, depending on the conditions in which they appeared, took the form of:

  • scale - FeO, Fe3O4, Fe2O3 oxides - iron oxidation products at high temperatures in the manufacturing process
  • rust - oxides, hydroxides and alkaline iron salts - atmospheric corrosion products resulting from the action of air and water


During etching, corrosion products are removed from the surface of the metal in various ways:

  • they dissolve in acid (e.g. products of atmospheric corrosion in hydrochloric acid)
  • they are separated from the substrate by the produced hydrogen (e.g. scale in sulfuric acid)


In order to give the etched surface resistance to further reactions with the surrounding environment, we subject the details to process of passivation.


Contact details

P.W. Cynkopol

ul. Glinki 146

85-861 Bydgoszcz

NIP: 953-100-96-88


tel. 884 884 819

fax. 52 363 00 62

Production and enquiries:

tel. 502 500 944

tel. 502 488 583


tel. 884 884 479

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