The Anodising Company Ltd
The Anodising Company Ltd


Alocrom is a Chromate conversion coating chemically applied to aluminium, which provides corrosion protection. It is also applied prior to painting or powder coating and is used when protection and/or electrical conductivity is required.

It is suitable for all types of aluminium alloy (N.B. Should not come into contact with foodstuffs) including castings and high silicon alloys which can be problematical to anodise.

Good electrical conductivity, corrosion resistance and good paint key are all benefits gained by Chromate Conversion.

Chromate conversion coatings currently carried out by us.

Alocrom 1000

Alocrom 1000 produces protective coatings on aluminium and its alloys without significantly changing the appearance of the aluminium surface. Alocrom 1000 is approved to MIL-C-5541 (Class 3) and is recommended where a very low surface electrical resistance is required. 

Alocrom 1200

Alocrom 1200 is ideal for coating all types of aluminium and aluminium alloys including high silicon pressure die-castings. It should be used on aluminium wherever maximum corrosion resistance and when electrical conductivity is required. It is suitable for components that are to be painted or left unpainted. It gives a protective golden coloured coating which is, like anodising, integral with the aluminium.

Light to medium Alocrom coatings have minimal effect on surface electrical resistance.

Alocrom 1200 is approved to DEF-STAN 03-18 and to MIL-C-5541C and MIL-C-81706. 

This process is also known as Alchromate, Bonderite 710 & Alodine 1200 .

Iridite NCP

The Iridite NCP, Non Chrome Passivate has been developed in response to the ELV, RoHS and WEEE directives. The Iridite NCP does not contain Lead, Cadmium, Chromium (hexavalent or trivalent), Mercury or PBB / PBDE compounds. Iridite NCP is an environmentally friendly chemical process that produces a protective conversion coating on aluminium and its alloys. This coating exhibits bare, unpainted, corrosion resistance that is equal to hexavalent chromates on many aluminium alloys. The coating can be used as a final finish and can also serve as a base for paints, high performance topcoats, powder paints, lacquers, or as a base for rubber bonding.



Elimination of the use of hazardous hexavalent and trivalent chromium.
Provides corrosion protection that rivals conventional chromate conversion coatings when tested in accordance with ASTM B 117.
The conversion coating passes the requirement of MIL-C-5541 for electrical contact resistance for Class 3 coatings.

Provides an excellent primer or paint base, or for other subsequent organic treatments when tested in accordance with ASTM D 3359.


Tank size for Iridite is 1200 x 600mm.


SurTec 650

A concentrated liquid trivalent chromium based chemical which when diluted with water
will form an iridescent blue to tan protective chromate coating of 50 – 500 mg/m2 on clean, oxide-free aluminium and aluminium alloy surfaces. It is approved for aerospace to U.S. MIL-DTL-81706 and MIL-DTL-5541F

Contains no hexavalent chromium – meets all RoHS test criteria (IEC1 11/24/CD).

Excellent corrosion protection with or without paint.
Excellent paint or powder adhesion allowing metal deformation after painting.
The coating has low electrical resistance - under 0.8 milli-ohms/cm2.


Tank size for SurTec is 1200 x 600mm.

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Unit S8

Wharf Way

Glen Parva






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