By V. F. Henley
Publication via Henley, V. F
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Extra info for Anodic Oxidation of Aluminium and its Alloys
The jigging material can be aluminium or titanium. The latter material is suitable for anodizing to coating thicknesses of up to about 12-15 fim but it is liable to lose electrical contact on thicker coatings unless heavy-pressure screw clamps are used. Titanium itself acquires a very thin anodic coating during the process and the colour of this coating varies from yellow to purple depending on the precise anodizing conditions. The thin coating does not have to be stripped after each anodizing operation —it is sufficiently fragile to break when the work being jigged is pressed against it.
It is especially useful where there is a high level of impurities in the water — for instance in some bore-hole supplies. Reverse osmosis is sometimes recommended as a preliminary purification process before final de-ionizing. The effect of this two-stage arrangement is to reduce Anodizing Equipment 39 considerably the work load in the de-ionizing unit and to decrease correspondingly the frequency (and cost) of regeneration. The following are guide figures for the maximum limits tolerable for various processing solutions: For Sulphuric acid anodizing Chromic acid anodizing Integral colour anodizing Hot-water sealing Chloride as NaCl Chloride as NaCl Sulphate as H2SO4 Chloride as NaCl Fluoride as NaF Silica as Si0 2 Phosphate as H3PO4 20 mg/1 20 mg/1 50 mg/1 10 mg/1 5 mg/1 10 mg/1 5 mg/1 Other impurities can be detrimental to hot-water sealing and it is good practice to carry out sealing tests on samples sealed in the proposed water supply (see Chapter 13).
The banding method is suitable for flat surfaces whilst the relative flexibility of mops and brushes indicates their use for more irregular surfaces. All three of these methods are useful for obtaining a matching appearance between wrought and cast metal. A special application of grinding is the finishing of aluminium spinnings and other items having a symmetrical longitudinal axis by holding garnet or "Aloxite" paper with paraffin lubricant against the metal whilst revolving on a lathe. The lined finish covers metal defects and disguises the distorted grain structure of spun and pressed sheet metals.