CORROSION BEHAVIOR OF ALUMINUM ALLOYS
Although aluminum is a chemically active metal, its resistance to corrosion is attributable
to an invisible oxide film that forms naturally and is always present unless it is deliberately
prevented from forming. Scratch the oxide from the surface and, in air, the oxide immediately
re-forms. Once formed, the oxide effectively protects the metal from chemical attack and
also from further oxidation. Some properties of this natural oxide are as follows:
• It is very thin—200–400 billionths of an inch thick.
• It is tenacious. Unlike iron oxide or rust that spalls from the surface leaving a fresh
surface to oxidize, aluminum oxide adheres tightly to aluminum.
• It is hard. Aluminum oxide is one of the hardest substances known.
• It is relatively stable and chemically inert.
• It is transparent and does not detract from the metal’s appearance.
J. G. Kaufman
Kaufman Associates
Columbus, Ohio
Mechanical Engineers’ Handbook: Materials and Mechanical Design, Volume 1, Third Edition.
Edited by Myer Kutz
Copyright 2006 by John Wiley & Sons, Inc.
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BalasHapusSome of the aluminium alloys like the aluminium 5052 have exceptional corrosion resistance and they are used in structures that are exposed to sea water which is corrosive in nature. Just wanted to add that info here. The information shared here is succinct and precise. Made for a good read.
BalasHapusAmong the 1xxx series, the aluminium alloy 1050 has high corrosion resistance and is used in chemical industries widely. Also, it has high electrical conductivity and is used in the manufacture of heat sinks. Good info about the corrosion resistance of aluminium alloys here; made for a good read.
BalasHapus