51314-4374-Investigation of Environmental Effects on Intrinsic and Galvanic Corrosion of Mild Steel Weldment

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Product Number: 51314-4374-SG

ISBN: 4374 2014 CP

Author: Lei Huang

Publication Date: 2014

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The effects of salt concentration and temperature on intrinsic and galvanic corrosion of the non-alloyed standard carbon steel weldment in CO2 environments have been investigated using different types of electrochemical techniques. Experimental results show that for the non-alloyed standard weldment the intrinsic corrosion rates of parent metal heat affected zone (HAZ) and weld metal are not significantly different but the corrosion of weld metal becomes worse and the parent metal is protected due to the galvanic effects between the segments. The experimental results also show that an increase of salt concentration (1~10 wt.% NaCl) significantly affected the intrinsic corrosion rate in a nonlinear fashion. The galvanic currents were unaffected by the different salt concentrations.A micro-electrochemical cell was also utilized to measure the corrosion behavior of carbon steel weldment in this project. Linear polarization resistance potentiodynamic sweep and electrochemical impedance spectroscopy measurements were performed in a microcell setup on 3 different segments of a weldment without the galvanic effect. The same electrochemical techniques were performed by uncoupling the segments in glass cell as a comparison. The consistent results between micro electrochemical cell and glass cell demonstrate that the micro electrochemical cell could be applied to the investigation of carbon steel weldments in CO2 system.