INVESTIGATION INTO TUBULAR STRUCTURE FORMED BY PITTING CORROSION ON THE SURFACE OF CARBON STEEL

Document Type : Research Paper

Authors

1 Research Center director of Engineering and Applied Science, Faculty of Engineering, Majmaah University, Saudi Arabia

2 Mechanical Engineering Department, Faculty of Engineering, Majmaah University, Saudi Arabia

3 Mechanical Engineering Department, Faculty of Engineering, Majmaah University ,Saudi Arabia

Abstract

The formation and development of pitting corrosion on carbon steel surface during the initial stage of immersion test in tap water have been studied by scanning electron microscopy. The pitting was analyzed for static and rotating specimens during immersion. The results showed that the features of the pits formed on the surfaces of samples that are rotating are different from those on the surfaces of static samples. Since the rotating-pit samples were followed by a tubular structure of corrosion products in the reverse direction of rotation. The results showed also that this tubular structure depends on the size of the pit and test time. Moreover, this tubular structure plays an important role in the development of damage to the surface. This shows that the corrosion products have a hostile influence. Interactions localized corrosion pits occurred between large and small pits in its configuration, as well as between the tubular structures. The features of formed pits were a cavity at the center of the pit and a rough circular band or ring of products around the cavity.

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JES. Journal of Engineering Sciences
Volume 41, No 2
March and April 2013
Pages 483-500

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