Chromic Acid Anodising
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It is necessary to minimise the loss of fatigue strength of workpiece, as compared with sulphuric acid-type processes.
The item to be anodised contains crevices or small blind holes from which it may be difficult to remove electrolyte; traces of the highly coloured chromic acid are easily seen but, in any case, are non-corrosive towards aluminium. In fact, this ability is exploited in the field of crack detection where the presence of chromic acid leaching out of a crack is easy to detect.
The coating is on metal less than 250 microns thick, the process and resultant coating have a less adverse effect upon the properties of the underlying metal.
- Defence industry components – especially those involving explosives, propellants or pyrotechnics where complete removal of the electrolyte is essential for safety reasons.
- Components containing crevices or small blind holes.
- Pre-treatment for painting, especially in aerospace applications.
- Flaw detection – a technique for identifying cracks, folds, inter-crystalline corrosion, machining damage, incipient melting of grain boundaries and cold shuts.