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51312-01206-Mechanism of Pitting Corrosion of Welded AISI 304 in a Freeze-Thaw Corrosive Environment

Picture for Mechanism of Pitting Corrosion of Welded AISI 304 in a Freeze-Thaw Corrosive Environment
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Product Number: 51312-01206-SG
ISBN: 01206 2012 CP
Author: Tsuyoshi Takahashi
Publication Date: 2012
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It is well-known that Cl- solution produces a pitting corrosion in a welded austenitic stainless steel. However the relationship between the pitting corrosion occurred in the stainless steel and the freeze-thawing environment has not yet clear. In this work the influence of freeze-thawing environment on a pitting corrosion which occurs in the welded austenitic stainless steel (SUS304) in Cl- solutions was investigated. SUS304 with bead-on-plate welding was used as a specimen. The specimen was fully immersed in FeCl3 solution. The freeze-thawing environment was recreated by a temperature fluctuation from 293K to 253K. As a result large-scale pitting corrosions produced mostly in the area of a high tensile residual stress and a sensitive metallographic structure near weld bead under the freeze-thawing environment. It is confirmed that the accelerated pitting corrosion phenomenon was introduced by concentration cell corrosion due to a local concentration of chlorine ion Cl- around weld bead during freezing and thawing of the solution. Furthermore it was clarified that the thinner plate thickness was and the longer one cycle time the more corrosion accelerated.
It is well-known that Cl- solution produces a pitting corrosion in a welded austenitic stainless steel. However the relationship between the pitting corrosion occurred in the stainless steel and the freeze-thawing environment has not yet clear. In this work the influence of freeze-thawing environment on a pitting corrosion which occurs in the welded austenitic stainless steel (SUS304) in Cl- solutions was investigated. SUS304 with bead-on-plate welding was used as a specimen. The specimen was fully immersed in FeCl3 solution. The freeze-thawing environment was recreated by a temperature fluctuation from 293K to 253K. As a result large-scale pitting corrosions produced mostly in the area of a high tensile residual stress and a sensitive metallographic structure near weld bead under the freeze-thawing environment. It is confirmed that the accelerated pitting corrosion phenomenon was introduced by concentration cell corrosion due to a local concentration of chlorine ion Cl- around weld bead during freezing and thawing of the solution. Furthermore it was clarified that the thinner plate thickness was and the longer one cycle time the more corrosion accelerated.
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