ELECTROCHEMICAL BEHAVIOUR OF Al-BRASS IN SEAWATER
Corrosion of the Al-brass in 3.5 % NaCl solution and natural seawater was investigated with potentiodynamic polarization technique. Corrosion rate obtained in natural seawater was higher than in 3.56 % NaCl solution. The metallographic examinations indicated the occurrence of pitting corrosion in both cases.
Characteristics of the Al-Brasses Affected Corrosion Properties
The Al-brasses are considered corrosion resistant construction materials often used to pipe systems in energy industry, where they are exposed to flowing liquids environments. In that system the brasses are loaded chemically and mechanically. The aim of our research work is to compare corrosion properties of four Al-brasses produced by different manufactures because in operation conditions they have dissimilar reliability and durability. The examined Al-brasses have similar chemical composition but differ in microstructure, surface state what affects their corrosion and mechanical properties. The effect of the mentioned parameters on corrosion and mechanical susceptibility to degradation are investigated by chosen experimental methods.
The protection of Cu by ferrous sulphate additions
It has been found that a film composed primarily of lepidocrocite (γ-FeO·OH) can be electrophoretically deposited on Cu cathodes from a NaClFeSO4 solution. The lepidocrocite film protects the Cu against corrosion by polarizing the local cathodes. The film has no detectable effect on the anodic dissolution of Cu.