Analisis Tingkat Kecepatan Korosi Besi dengan Menggunakan Sinar Gamma

Abstract

In order to examinate rate of iron corrosion, we have conducted a research using apparatus Geiger-Muller Tube with sources radiation standard Co-60 as a source of Gamma ray. The samples, iron plate with diameter 2 cm and thichness 0.13 cm, were corroded by various media of corrosion i.e. water (H2O), solution of salt (NaCl) and sulphuric acid (H2SO4) with interval time corrosion ± 5 days, 10 days, 15 days, 20 days, and 25 days. Firstly, we estimated intensity of Gamma ray before (Io) and after (I) passing through the samples, and then we evaluated the absorption coefficient of samples. We obtained that equation of absorption coefficient is A (water) = 0.0014t – 0.4608; R2 = 0.9184, A (salt solution) = 0.0015t – 0.4589; R2 = 0.8886 and A (sulphuric acid) = 0.0017t – 0.4532; R2 = 0.780. We calculated that the rate of corrosion for water, salt solution and sulphuric acid is 0.0014 gr/cm2/day, 0.0015 gr/cm2/day and 0.0017 gr/cm2/day respectively. The result shows the rate of corrosion caused by sulphuric acid larger than corroded by salt and water. In addition, the rates of corrosion of iron depend on interval time of corroding iron plate and media of corrosion. Another factor which may be related to rate of iron corrosion such as temperature, humidity and concentration of media of corrosion should be considered for next future.

Keywords

• rate, corrosion, iron and gamma ray