Dezincification
The dezincification is a type of corrosion , which especially for copper - zinc - alloys (eg. Brass occurs) with more than 20% zinc.
During this corrosion process, copper is usually deposited as a spongy mass from the brass. The zinc either remains in solution or is deposited in the form of basic salts over the corrosion point. Dezincification can occur locally and in depth or over an extensive area.
The emergence of this corrosion requires thicker layers of corrosion products, lime deposits or other deposits of foreign parts on the metal surface. Water with an increased chloride content favors the occurrence of dezincification at higher temperatures and at low flow velocities . Dezincification often occurs in connection with severe biofilm formation .
literature
- Karl-Helmut Tostmann: Corrosion. Causes and avoidance, Wiley-VCH Verlag GmbH, Weinheim 2001, ISBN 978-3-527-30203-1 .
- E. Kauczor: Metallography in the damage investigation. Springer Verlag, Berlin / Heidelberg 1979, ISBN 978-3-540-09362-6 .