PENGARUH SALINITAS TERHADAP KINERJA BEBERAPA SACRIFICIAL ANODE PADA PROTEKSI KATODIK DI LINGKUNGAN LAUT

Abstract

Cathodic protection is one of the methods for protecting metal from corrosion attack. This research was aimed to determine the ability of some sacrificial anodes used for cathodic protection in marine environment.  The salinity levels used in this experiment were 33‰, 35‰, and  37‰. Sacrificial anodes used were alluminum alloy, zinc alloy, and magnesium alloy, whereas protected cathode or stucture was carbon steel. The performance variables measured  were corrosion rate and the corrosion model for the sacrificial anode and cathode. Marine environment in this research was  changed with chemical  solution and the composition  in accordance with the experiment standards. Results of the research showed that magnesium anode had the largest corrosion rate, whereas zinc had larger corrosion rate than that of alluminum. Micro picture showed the corrosion type was pitting corrosion, which occured either in anode or cathode.