Abstract
Corrosion is described as material’s destruction or deterioration because of reaction with its surrounding environment. This type of degradation represents a tremendous economic loss since so much value of loss being described. Mostly, in petroleum industry, mild steel are still the most commonly used metal to build structures. However, acid which is hydrochloric acid has been used as acidizing operation since its advantage over other mineral acid. This may cause mild steel structure susceptible to corrosion. This project is about the study of the rate of corrosion on SMAW and GMAW welded mild steel with different time of exposure. The comparison of f these two type of welded joint were subjected for microstructure analysis using SEM/EDX. Welded mild steel were prepared using SMAW and GMAW process with dimension of 100mm x 50mm x 6mm. Then, samples were inspected using NDT technique using magnetic particle testing. After that, the samples were immersed in 6 mol of HCl acid. Then, the corroded samples were cross-sectioned and were examined using SEM/EDX. The results show that, the rate of corrosion on SMAWwelded mild steel is higher compared to the GMAW welded mild steel. As the duration of exposure increase, the weight loss also increased as well as the value of the corrosion rate. This results were supported by the MPT showing that the flaws and defects on the SMAWwelded mild steel might be the cause that act as a stress raiser and thus, enhancing the corrosion degradation.
Highlights
Corrosion is described as the metal’s destruction or deterioration because of reaction with surrounding environment
When hydrochloric acid used as acidizing treatments, the oil well structure is susceptible to the corrosion and subsequent degradation would occur on mild steel surface and its welded area
Material that been used in this work is mild steel or low carbon steel (LCS) since it is widely used in the petroleum industry to build oil well, pipelines, flow lines and etc
Summary
Corrosion is described as the metal’s destruction or deterioration because of reaction with surrounding environment. Corrosion in petroleum industry is due to sodium chloride, sulphur, hydrochloric and sulphuric acid and water than the oil, naphtha or gasoline [1,2,3]. When hydrochloric acid used as acidizing treatments, the oil well structure is susceptible to the corrosion and subsequent degradation would occur on mild steel surface and its welded area. The current paper presents the corrosion rate assessment of welded mild steel using different types of welding process which are SMAW and GMAW process in hydrochloric acid environment. The comparison of these two types of welded joint was subjected for microstructure analysis using SEM/EDX
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