A multipurpose anodising plant for non ferrous metals - Aluplanet

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MultiAnodHK Figure 32 – Interference colours produced on titanium pieces (13) 24
MultiAnodHK 3 – The quality control of the finishing produces with SweetMag Note: Before any decision to start our production a long series of tests was specifically performed by Qualital Laboratory of Cameri (NO) on samples prepared by Italfinish (17) A very serious problem we had to face with magnesium materials was that there are no “official” specifications for quality control of magnesium finishing treatments. There are some “internal specs.” filed by the Companies or Groups of automotive or aeronautical field the “supplier” has to fulfil to be accepted in the “supplier’s list”. All this is absolutely regular, but according our opinion it should be necessary to have some “basic” regulation to which everybody can refer. For the tests described below, some tests are derived from those used for anodised and painted aluminium The tests performed and the applied methods are as follows. 1) Measure of the thickness of the anodic layer with and without organic coating according to eddy current method (ISO 2360) 2) Measure of the thickness of the anodic layer with the micrographic method (ISO 1463) 3) Evaluation of the adhesion (UNI EN ISO 2409: 1996- cross etch). 4) Test in humid-static cabinet (humidity 100%) (UNI 8744: 1986). 5) Neutral salt spray test (UNI ISO 9227:1993 – ASTM B 117) Notes 1) The “eddy” current method to measure the anodic coating on magnesium parts is “technically” correct because the thickness of a non conductive layer on a conductive base is checked, but, in practice, the high roughness of those surfaces make the measure not always accurate. The micrographic method gives a more precise result. 2) Neutral salt spray test is used because the acidy of the acetic salt spray test commonly used for aluminium is not compatible with the strong reactivity of magnesium metal. The result of your tests have been reported and published several time, who is interested can refer to some papers of ours (5) At the present time two specific work groups of Unimet (Italian Technical Committee for Standards and Specifications) is preparing a new standards concerning finishing on magnesium and titanium because no official specific regulation is available for this type of metals 4 – Conclusions The main task of the Authors was to set up a simple, reliable, and low energy consumption process essentially for magnesium and its alloy when a massive production was requested and the finishing cost should be not significant for the total cost of the item. When a magnesium piece is an important mechanical part of a helicopter or a car, the cost of its finishing is easily “adsorbed” in the final cost of the vehicle. In some cases, special technical feature are requested to the finishing layer that can increase the cost of the treatment, but there is a wide share the market needing a good but cheap finishing. The same process can have an interesting application for die cast aluminium obtaining interesting white finishings even when the silicon content is high. Metals of the titanium family can give attractive finishing. 25
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A multipurpose anodising plant for non ferrous metals - Aluplanet

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