Tel: 020 8577 3452

Chromate and Non-Chromate Conversions

Chromate conversion coatings are processes that affect the surface of a part and result in no measurable build up. These coatings are commonly used as an undercoat before painting. Depending on the coating and the class of said coating, the electrical resistance and corrosion resistance can vary. Non-chromate conversions are ROHS compliant finishing alternatives to traditonal chromate conversions.

Alocrom 1200/Alocrom 1000

These two processes are chromate conversions. Alocrom 1200 is a surface treatment that gives a part a distinctive yellowy/gold colour- which stems from the hexavalent chromium present inside the solution. The intensity of the colour is dependent on immersion time and the material grade of the aluminium.

Alocrom 1000 offers the same protections as Alocrom 1200 but offers a clear finish.

Advantages of Chromate Conversions:

  • Good corrosion resistance
  • Good paint base
  • Strong electrical conductivity

Tank Sizes:

1200: 6ft x 2ft x 3ft

1000: 3ft x 2ft x 3ft

Iridite NCP/ Surtec 650

Unlike the aforementioned Alocrom processes, both Iridite NCP and Surtec 650 are ROHS compliant conversion coatings. These surface finishes both provide a silvery-clear finish to a part and the solution does not contain any hexavalent chromates. Instead, Iridite is a non-chromium passivate and Surtec 650 is a trivalent chromium passivate. Both processes offer similar advantages.

Advantages of Non-Chromate Conversions:

  • Good corrosion resistance
  • Good paint base
  • Strong electrical conductivity
  • ROHS Compliant

Tanks Sizes:

Iridite NCP: 3ft x 2ft x 3ft

Surtec 650: 3ft x 2ft x 3ft

Tel: 020 8577 3452


  • Jackson Plating
  • Unit 1
  • Fairfields Works
  • Fairfields Road
  • Hounslow
  • London
  • Middlesex
  • TW3 1UZ
  • Tel: 020 8577 3452
  • Fax: 020 8570 4599
  • E-Mail:
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