Transcription of Technical Bulletin - Vecom
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Technical Bulletin - Vecom
Pag. 1 TB 2004/17 Number: 2004/17 September 2004 PICKLING, AN EXCELLENT SURFACE TREATMENT FOR ALUMINIUM Introduction In comparison with other frequently applied materials such as iron, copper, tin and gold, the use of aluminium is still relatively new, historically speaking. In the meanwhile aluminium has become indispensable as a construction material, in particular because of the combination of favourable qualities such as its light weight, its strength and a high corrosion resistance. Passivation and corrosion Aluminium is a base metal that spontaneously oxidizes when it comes into contact with oxygen from the air. Hereby the aluminium is covered with an oxide skin of aluminium oxide. This natural oxide skin can protect the underlying aluminium, under non-burdening conditions, against corrosion. This process of natural oxidation and the formation of a corrosion-protective oxide skin is called passivating.
Pag. 2 – TB 2004/17 How does the pickling process work? Aluminium is an amphoteric metal, that is to say, the metal dissolves in an acid as well as in an alkaline environment.
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