@article{oai:kitami-it.repo.nii.ac.jp:00007658, author = {石塚, 和則 and 高橋, 剛 and 柴野, 純一 and 三浦, 節男 and 小林, 道明}, issue = {776}, journal = {日本機械学會論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A}, month = {Apr}, note = {Welded structures in coast regions in Hokkaido prefecture are exposed to the severe environment such as a freeze-thawing of a liquid included with a chlorine ion Cl- that is brought by a sea breeze and a snow melting agent during a winter season. On the other hand, it is well-known that Cl- solution produces a pitting corrosion in an austenitic stainless steel. However, the relationship between the pitting corrosion occurred in the welded austenitic stainless steel and the freeze-thawing environment have not been clarified yet. In this work, the influence of freeze-thawing environment on a pitting corrosion occurred in the welded austenitic stainless steel in Cl- solutions was investigated using SUS304 specimen with bead-on-plate welding. The specimen was fully immersed in FeCl3 solution. The freeze-thawing environment was recreated by a temperature cycling from 20°C to -20°C. As a result, large-scale pitting corrosions was induced mostly in the area of a high tensile residual stress and a sensitive metallographic structure near weld line under the freeze-thawing environment. It is confirmed that the accelerated pitting corrosion phenomenon was introduced by a concentration cell corrosion due to a local concentration of chlorine ion Cl- around weld line during freezing and thawing of the solution.}, pages = {660--669}, title = {凍結融解腐食環境下にあるSUS304 溶接材の孔食促進}, volume = {77}, year = {2011} }