Oil and gas industry has been hugely contributing any government income and this industry is highly required to control corrosion failures in pipelines which may potentially cause substantial human and economic losses. The objective of this study is to study the effect of sulfuric acid (H₂SO₄) electrolyte concentration to corrosion behavior of the internal surface of natural gas pipeline by using Tafel extrapolation method. Surface morphology of the samples is studied using optical microscope and scanning electron microscope to investigate the correlation between the corrosion rate and surface morphology. As results, the corrosion rate increases with higher concentration of H₂SO₄. Microscopic analyses also confirmed the presence of pitting corrosion, and micrometer thick of corrosion product was developed on the surfaces. The data can be used to managing the pipelines effectively and prevention method can be taken in order to extend the life span of the pipeline.