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Chromate Conversion Coatings

Chromate conversion coatings are usually specified for corrosion resistance and low electrical contact resistance on aluminium. We offer Alocrom 1000, Alocrom 1200, SurTec 650 TCP and Irridite NCP.

Alocrom 1000 is a clear to colourless coating used for low electrical contact resistance.

Alocrom 1200 is a yellow to brown coating used as a base for paint or for improved corrosion resistance.

SurTec 650 TCP is a trivalent chromate, the coating is clear to colourless and is depending upon application conditions is used for corrosion resistance or low electrical contact resistance.

When specifying chromating, wherever possible we recommend referring to published standards, providing at least the following information;

  • Specification reference
  • The grade and temper condition of the material
  • Significant surfaces
  • Type/grade of conversion coating required
  • Any areas that cannot be used for jigging
  • Any special inspection and packing requirements

If parts are to be painted after processing there are restrictions on the time delay between conversion coating and painting.

SurTec 650 TCP is hexavalent chromium free.

The manufacturers of Alocrom 1000/1200 state that these coatings are RoHS/ELV compliant when dried in accordance with their instructions, however these drying temperatures are higher than the permitted drying temperature in AMS 03-18

Alocrom is also known as Alodine.

We chromate to the standards shown below. We also hold a large library of customer-specific, superseded and legacy specifications so contact us if you need any help.

  • AMS 03-18 (Def Stan 03-18)
  • Mil-DTL-5541 (MIL-C-5541)

For more information download our Chromating info sheet or contact us for a quote.