Abstract
This study investigated how 0.33% medium carbon steel is affected by induced stress in a saline environment. Three geometries namely U-bend, C-ring and I-shape samples were formed representing varying degrees of stress level induced on the samples. The test specimens were subjected to static loading in saline environment containing 15.0 wt.%, 10.0 wt.% and 3.5 wt.% of sodium chloride (NaCl) for a typical exposure time of 31 days at ambient conditions of temperature and pressure. Weight loss method was used to estimate the corrosion rate in mils per year (mpy). The results of the experiment show that corrosion rate is maximum in samples with the highest stress level and in medium containing highest amount of dissolved chloride ions. The least corrosion rate occurred in samples with the least amount of chloride ions and in a non-stressed condition. It was inferred that the corrosion rate of 0.33%C steels increased with increasing tensile stress and chloride ions content of the medium. Key words: Stress corrosion cracking, medium carbon steel, saline environment, corrosion rate.
Highlights
Corrosion has persistently become a major problem and has attained a global nature in which there is no facet of human endeavour where its impact is not felt and recognized
The variation of corrosion rate of I-shape, C-ring and Ubend samples at different concentrations of sodium chloride (NaCl) with increasing exposure time respectively is given in Figures 4 to 6
Induced tensile stress increases the corrosion rate of medium carbon steels when they are in contact with chloride-ion environment
Summary
Corrosion has persistently become a major problem and has attained a global nature in which there is no facet of human endeavour where its impact is not felt and recognized. Corrosion problems in production plants can increase substantially the operation and maintenance cost. One of the most costly problems facing the oil companies is corrosion in crude oil systems. Its behavior is a fundamental parameter in the design and application of structural steel such as reinforcement members in structures. This is because they can be readily bent or prestressed. Corrosion has proved to be a major threat to its favourable mechanical properties
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