Electropolishing, Deburring, Pickling, Passivation

Pickling

Pickling ensures the corrosion resistance of components made of stainless steel and thus considerably influences their service life and fitness for purpose.

The principle

Pickling achieves an intensive cleaning and activation of metal surfaces, through the removal of a thin layer of the material processed. The result is a metallically pure surface, free of oxides and contamination of other metals. Pickling attacks primarily the grain boundary of the metal structure and gives the surface a matt to satin gloss appearance.

Pickling can be carried out either chemically or electrolytically (anodically). Pickling chemicals usually contain mineral acids and an oxidation chemical as well as additives to improve the result and reduce pollutants.

The application

Several methods are available for the pickling process:

  • Immersion pickling for immersing, sprinkling or through-pumping
  • Spray pickling involves spraying on an adhesive pickling paste onto free-standing areas
  • Brush pickling for local treatment by painting the chemicals e.g. onto welding seams

Non-rusting steels, nickel-based alloys and titanium are usually pickled following processing, in order to create a good starting point for the further processing or creating an intact passive layer as a precondition for corrosion resistance.

Normal steel, copper materials and aluminium are pickled for cleaning purposes or pre-treatment before electropolishing, chemical deburring, polishing, anodizing or galvanizing.

Rinsing water and used pickling chemicals must be treated and disposed of in accordance with the legal regulations.

POLIGRAT processes and products

Stainless steel and nickel-based alloys

Chemical immersion pickling:

  • POLINOX B with additives to prevent nitrous gases, nitrite and chromates
  • POLINOX NF nitrate-free
  • POLINOX UB (patented) free from mineral acids, environmentally friendly, can also be applied anodically
  • POLINOX VA 100 (patented) free from nitrates, sulphates or phosphates. For all stainless steels, optionally with or without metal removal, can also be operated without waste water in a closed system.

Electrolytic immersion pickling (anodic):

  • POLINOX AB
  • POLINOX UB

Spray pickling:

  • POLINOX FL Dispers
  • POLINOX FL Aktiv

Brush pickling:

  • POLINOX P Rapid
  • POLINOX P Retard

Titanium and titanium alloys (immersion pickling)

  • POLINOX TB 100

Carbon steel (immersion pickling)

  • POLINOX BESTA (pickling inhibitor)
  • POLINOX BESTA S (without hydrochloric acid, no hydrogen embrittlement)

Aluminium and aluminium alloys

  • POLINOX AT 100
Pickling - Chemical plant, pickled on site and passivated for improved corrosion resistance and metallic purity
Stainless steel fittings, pickled chemically and cleaned for improved corrosion resistance
untreated welding seam
treated welding seam
Titanium sheet, untreated
Titanium sheet, pickled for improved corrosion resistance

materials

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contact

POLIGRAT GmbH
Valentin-Linhof-Straße 19
81829 Munich
Germany


Tel: +49 (89) 42778-0
Fax: +49 (89) 42778-309


info@poligrat.de

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Aldershot
Hampshire GU 124 RH
Great Britain


Tel: +44 (1) 252 336337
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Edmonton, Alberta T6K 0P6
Canada

 

Tel: +1 (780) 756 3767
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Houston, TEXAS 77092
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Tel: +1 (713) 6803777
Fax: +1 (713) 6803618

 

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Weidenweg 17
4310 Rheinfelden
Switzerland

 

Tel: +41 (62) 391.88-10
Fax: +41 (62) 391.88-11


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POLIGRAT
Cèhmester u. 8.
2170 Aszód
Magyarorzag Kft.
Hungary

 

Tel: +36 (28) 553 060
Fax: +36 (28) 553 061


info@poligrat.hu
www.poligrat.hu

contact form

POLIGRAT GmbH
Valentin-Linhof-Straße 19
81829 Munich
Germany

 

Tel: +49 (89) 42778-0
Fax: +49 (89) 42778-309


info@poligrat.de
www.poligrat.de

contact form

Beizen, Methoden, Badbeizen, Berieseln, Durchpumpen, Sprühbeizen, Pinselbeizen, Schweißnähten, Nichtrostende Stähle, Nickelbasislegierungen, Polinox, Korrosionsbeständigkeit, Normalstahl, Kupferwerkstoffe, Aluminium, Reinigung, Vorbehandlung, Elektropolieren, Entgraten, Polieren, Anodisieren, Galvanisieren, gebeizt., POLIGRAT-Verfahren, Produkte, Aluminium, Edelstahl, Kobaltlegierungen, Kohlenstoffstähle, Kupfer, Kupfer-Legierungen, Magnesium, Nickel, Nickel-Legierungen, Sondermetalle, Titan, Zirkon,