The influence of chloride anions on the pitting corrosion of aluminum alloy en 46000

Abstract

The corrosion behavior of AlSi9Cu3 aluminum alloy, which is commonly used for manufacturing radiators of remote central heating systems, is investigated. The tendency for pitting corrosion is investigated in the phosphate buffer solution at pH = 7, in the sodium chloride anion concentration range 10-300 mg dm-3. The critical pitting potentials are estimated. The behavior of aluminum alloy and copper corrosion couple is also investigated.Ispitano je korozivno ponašanje aluminijumske legure AlSi9Cu3, koje se obično koristi za proizvodnju radijatora u sistema daljinskog centralnog grejanja. U fosfatnom puferskom rastvoru pri pH = 7, u opsegu koncentracije natrijum hlorida 10-300 mg dm-3 ispitivana je tendencija ka tačkastoj korozije. Procenjeni su kritični potencijali pri kojima može doći do tačkaste korozije. Ispitano je i ponašanje aluminijumske legure i bakarnog korozionog sprega.