Effect of deformation conditions on the corrosion behavior of the low alloy structural steel girders

By Al-Duheisat, Salman A.; El-Amoush, Amjad Saleh
Published in Materials & Design NULL 2016

Abstract

Abstract Structural steel girders type {A36} were subjected to different degrees of predeformation and monitored by accelerated corrosion tests. The potentiodynamic polarization curves of the structural steel specimens revealed that the predeformed specimens to a higher degree of the deformation exhibited the lowest corrosion potential than that of the non-predeformed and slightly predeformed structural steel specimens. The corrosion current density of the predeformed steel specimen to an elongation of 0.25% is about three times higher than that of the non-predeformed one. The above results were confirmed by corrosion mass loss rates after exposure the predeformed structural steel specimens to 4.5 M NaCl solution. Thus, the weight loss rate of the predeformed steel specimen to an elongation of 0.25% is about two times higher than that of the non-predeformed or as-received. Microscopic observations of the exposed surfaces after potentiodynamic polarization testing showed that few and small cracks were initiated on the surfaces of the non-predeformed, while well-developed and large cracks were observed on the surfaces of the predeformed structural steel specimens to a higher elongation. The severity of corrosion of the structural steel is increased with increasing the predeformation.

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