The Alocrom 1200 process is the main chromate conversion coating that we provide. Alocrom 1200 is marketed under the name Alodine 1200 outside of the UK and drawings calling for Alodine 1200 can be coated with Alocrom 1200 and vice versa.

Alocrom 1200 has a distinctive yellow colour, due to the presence of hexavalent chromium. The intensity of this yellow varies from colourless to deep yellow/orange depending on the desired properies. For example, for maximum electrical conductivity, the coating is colourless to very light yellow, whereas for maximum corrosion protection it is a deeper yellow.

Alocrom 1200/Alodine 1200 is on the QPL list for MIL-DTL-5541 (MIL-QPL-81706).

Alocrom exhibits a degree of self-healing to minor damage, such as small scratches. In the presence of moisture, it leaches chromium (VI), which acts as a corrosion inhibitor at the damage sites.

Alocrom is frequently specified as a pre-treatment prior to painting. Our in house state-of-the-art paint spraying facility has the capability to apply a wide range of paints, including etch primers, epoxy primers and a variety of top coats such as epoxies and polyurethanes. The close working relationship between our paint and treatment departments means that we are able to ensure that time limits are observed and that coatings show good intercoat adhesion. Our customers are able to benefit in using a "one stop shop" for their coatings and value the ability to make one company responsible for the performance of the whole coating system.

Corrosion Resistance

• Coating is yellow to deep orange/brown in colour.
• Provides a base for painting (often without the need for an etch prime) and allows bonding.
• Acceptable to use as a final finish.
• Complies with MIL-DTL-5541 Type I Class 1A and Def Stan 03-18 Code C

Electrical Conductivity

• Coating is almost colourless. Provides increased corrosion resistance while still preserving electrical conductivity (unlike anodising).
• Provides a base for painting (often without the need for an etch prime) and allows bonding.
• MIL-DTL-5541 Type I Class 3 Def Stan 03-18 Code E

Specifications Offered

• Def Stan 03-18
• MIL-DTL-5541 (replaces MIL-C-5541) Type 1 Class 1A or Class 3
• Def Stan 21-5 3-1 (replaces NWS 1005/3-2 and NWS 1005/3-1)
• TS112 D6 and TS112 D6A
• TS112 D6B
• DS26.00 D6, D6A and D6B
• EN 2437
• JP201

We can work to many other specifications, but the above are our most popular. Please contact us with your requirements.

RoHS Compliance

Alocrom 1200 is not RoHS compliant. We offer RoHS compliant alternatives to Alocrom 1200.