Layer corrosion

Layer corrosion is a layer-like, selective corrosion, which here is intergranular and in sensitive areas preferably in planes parallel to the rolling plane. The extensive peeling is caused by the voluminous corrosion products that form.

As exfoliation corrosion is electrolytic removal of metal in neutral or acidic media referred to in individual surface sites which holes having a depth generally larger than the hole diameter ( pitting corrosion ) is generated.

In contrast, alkaline media cause a flatter type of attack, which is also referred to as depression corrosion. In the case of pitting corrosion of ultra-pure and pure aluminum, of copper and zinc-free castings and wrought alloys, there is approximately the same limit potential.

literature

• Elsbeth Wendler-Kalsch, Hubert Graefen: Corrosion damage theory . Springer Verlag, Berlin / Heidelberg 2012, ISBN 978-3642304316 .

Individual evidence

1. ^ F. Ostermann: Application technology aluminum. 2nd act. Edition. Springer-Verlag, Berlin / Heidelberg 2007, p. 246.

Web links

• Types of corrosion of aluminum and its alloys (accessed September 7, 2018)
• What is “stratification corrosion”? (accessed on September 7, 2018)
• Corrosion damage analysis (accessed September 7, 2018)
• Comparison of different materials for blow molds with regard to the corrosion behavior (accessed on September 7, 2018)
• Microscopic-structural and electrochemical aspects of Al-Mg-Si corrosion (accessed September 7, 2018)