Study of Corrosion Behavior of Magnesium, Titanium and Stainless steel by Electrochemical techniques
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Abstract
Nowadays, magnesium alloys, titanium alloys and stainless steel are extensively used in automotive and aerospace industries because they are light in weight and exhibit high strength-to-weight ratio. Due to their excellent properties, fuel consumption and exhaust emission of vehicle can be reduced while its safety capability can conserved. However, a major problem in the use of metals in many industries is corrosion. Therefore, this research is aimed at investigating corrosion behavior of pure magnesium, pure titanium and stainless steel AISI 304 in deionized water and solution containing aggressive Cl- ions by using 2 electrochemical techniques: measurement of open circuit potential with time and polarization measurement. It was found that both techniques provided the same results that all 3 materials exhibit different corrosion behavior. Magnesium underwent uniform corrosion in deionized water and this uniform corrosion was escalated into more serious in solution containing chloride ions. For titanium, passive oxide film was formed on its surface when immersion in deionized water but in solution contain chloride ions, its passive surface was attacked by few metastable pitting corrosions. For Stainless steel AISI 304, serious metastable pitting corrosion was observed when it was immersed in solution containing chloride ions and the stable pitting corrosion of stainless steel as well can be easily activated by applying low voltage. Both electrochemical techniques lead to the same results, but measurement of open circuit potential with time requires no external perturbation so it is considered as a nondestructive technique and can be applied to a real time corrosion monitoring system.
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