Corrosion behaviour of aluminium materials in aqueous cleaning solutions

摘要

Especially in the car and aviation industry aluminium and its alloys are the most important materials. One advantage of aluminium is the generally passive and corrosion resistance in aqueous solutions within a defined pH range except for pitting corrosion due to some reactive species, such as chloride. While pure aluminium is covered by a homogenous oxide layer, aluminium alloys often consist of several phases (aggregates and mixed phases of alloying elements) leading to an inhomoge-neous oxide layer. The effect of alloying elements on the breakdown of the passive film was extensively studied using various grades of aluminium and different metals [1,2].