AA ANODISING UK LTD
SPECIALIST IN METAL FINISHING

HARD ANODISING

 

Hard anodising, is formed by using an electrolytic solution of sulphuric acid approximately between 3 - 5 degree's and current density of 23 to 37 amps per square foot. The process will run for 20 to 120 minutes depending on the alloy used and desired coating thickness. This will produce a generally grey coating 10 microns to 50 microns thick with a 50% build up and 50% penetration.

 

PROPERIES

 

Hard anodising provides for several desirable qualities such as

 

 

 

Hard anodising coating may be dyed a variety of colours. However, due to its naturally darker appearance, dyeing does not produce the vibrant colours that  sulphuric anodising will. Additionally, the required sealing process after dyeing does slightly reduce hardness.

 

SPECIFICATIONS

 

There are hundreds of governmental industrial, and commercial anodising specification in use, each with their own method of calling out coating, seals, dyes etc.

 

MATERIALS

 

Hard anodising works very well with 6000, 5000 and 7000 series alloy. High copper 2000 series alloys can present some difficulties and should be avoided if possible. As with all forms of anodising high-silicon die-castings are not recommended. Please see our materials chart for more information.

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