Advanced Metallization for Ulsi Applications by T. S. Cale, F. S. Pintchovski

By T. S. Cale, F. S. Pintchovski

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Failure to do so may result in pitting of the aluminium due to galvanic attack, this being more liable to occur with copper-containing alloys. The method must not be used for assemblies containing other metals, particularly steel or copper, and contaminants such as chlorides and salts of copper and iron must be avoided to prevent pitting. 6 CLEANING OF CORRODED ALUMINIUM Where it is necessary to retreat aluminium components that have become coated with corrosion products, the following method should be used: Components are immersed in the following solution, contained in a stainless steel (EN58J) tank.

This finish cannot be obtained by anodising, due to the alloying elements normally 36 Surface Treatment and Finishing of Aluminium present, such as silicon, and to the metal structure developed during casting. Forgings can also be electroplated. Most plating on aluminium is, however, carried out on wrought products such as those produced from rolled sheet or extrusions. 1). This is the largest application of its kind in the world, situated in an industrial situation not normally regarded as being a mild atmosphere.

1 BACKGROUND TO PLATING Coating metals such as brass, copper or steel with other metals by electroplating is a frequent finishing process, and plating by chromium on to other metals is commonly carried out to improve the appearance, to provide protection or to impart different surface characteristics such as improved hardness etc. It is natural, therefore, to consider electroplating metals on to aluminium for the same reasons, but there are certain differences in treatment which have to be taken into account.

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