51316-7421-Effects of Crevice on the Corrosion Behavior of Welding Joint in Simulated Groundwater

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Product Number: 51316-7421-SG

ISBN: 7421 2016 CP

Author: Liu Chao

Publication Date: 2016

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A more safe and reliable method to dispose the high-level waste is Geological disposal with the waste sealed in waste packaging containers presently. Container materials choices are mostly metal or metal alloy. After placed in the repository the greatest threat to the packaging container is corrosion caused by contact with the ground water or brine which might be present in the underground environment. Many research shows that the welded joint as a special area that formed in the process of sealing the containers are more likely to be subjected to corrosion. This paper investigates the general corrosion and crevice corrosion behavior of the welding joint of 16Mn and Q235 in simulated underground water. The welding joints are made by Tungsten Inert Gas Arc Welding method and Electron Beam Welding method. Scanning Electron MicroscopyContour-graph and Electrochemical workstation havebeen used in this experiment. Welded joints were soaked in different simulated underground water with different temperature and oxygen concentration for6 months. The most work focuses on the effects of the cracks on the corrosion behavior of the welded joint. Weld area shows good corrosion resistance except the argon arc welding joint of Q235. The results showed that the welding joints of the both steels with crevice specimens were more serious corrosion than that without crevice specimens in the aerated groundwater at 90°C or room temperature. The existence of the crevice has a promoting effect of corrosion on the weld area. In the deaerated groundwater the presence or absence of crevice has no significantly effect on the corrosion of welding joint. The corrosion morphologies of inside crevice of the steels were the same (local corrosion like pitting corrosion appeared) in both the aerated and deaerated groundwater at 90?.