Graph Engineering

Metal Finishing Specialists

Dual Finishing

This is a specialist process which is used in applications where both high corrosion resistance and areas of electrical conductivity are required on the same component. Dual finishing or selective anodising which it is also called is available for a combination of sulphuric anodising and chromate conversion as well as hard anodising and chromate conversion. The process involves the ‘masking’ of areas which are to be free of anodising, these may be specific holes, earthing points or areas of maximum tolerance sensitivity.

As this process is 100% manual and therefore extremely demanding from a labour point of view, lead times for such jobs is generally extended to 7-9 working days, dependant on batch size. It would be important to contact us in good time to discuss such projects in order that some preparatory work can be done.