ششمین سمینار الکتروشیمی ایران , 2010-10-09

Title : ( Weldment corrosion characterization of multi-pass hybrid GTAW-SMAW 2205 duplex stainless steel in 3.5%NaCl solution )

Authors: M. Golyani , Mohammad Hadi Moayed , A. Davoodi ,

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@inproceedings{paperid:1018314,
author = {M. Golyani and Moayed, Mohammad Hadi and A. Davoodi},
title = {Weldment corrosion characterization of multi-pass hybrid GTAW-SMAW 2205 duplex stainless steel in 3.5%NaCl solution},
booktitle = {ششمین سمینار الکتروشیمی ایران},
year = {2010},
location = {IRAN},
keywords = {2205 alloy is an austenitic-ferritic stainless steel with superior corrosion resistance encompassing numerous applications in marine environments and petroleum industrials. Nevertheless; welding operation changes the microstructure; austeniteferrite (γ/) ratio and also causes precipitation of various phases such as σ; α´; χ; etc. which certainly have remarkable influence on alloy corrosion resistance. In this study; single root-pass gas tungsten arc welding (GTAW) followed by multi-pass shielded metal arc welding (SMAW) operations were performed on a V-shape weld groove. Nirich filler electrodes of grade ER2209 and E2209 was used; respectively; for GTAW and SMAW operations. Corrosion behavior of GTAW; SMAW; inter-passes; cover-pass regions and corresponding HAZ (heat affected zone) were carefully examined in 3.5% NaCl solution by several DC electrochemical techniques including open circuit potential (OCP); potentiodynamic polarization (PD); potentiostatic polarization (PS) and Zero resistance ammetery (ZRA) tests. OCP values could be sorted on descent as base metal; GTAW; cover pass SMAW; HAZ; and inter-passes SMAW. PD tests demonstrated that passivity range; passivation potential (Epass) and current density (Ipass) related to GTAW; cover-pass SMAW were almost similar to the base metal. Other regions showed inferior passivation behavior. However; all regions represent transpassivity behavior and no pitting could be observed in a large anodic PD. The PS tests in 200; 500 and 700 mV anodic potentials showed that in all of regions Ipass was stable and increases from GTAW; base to SMAW regions. Galvanic corrosion rate measured by ZRA after 150 hours for three possible couples; base-SMAW; base-GTAW and base-HAZ; revealed that current densities of three couples were negligible with highest current density of 250 nA.cm-2; associated to the base-HAZ couple; confirming the OCP results in which the largest driving force (OCP difference) was measured between this couple. In summary; from corrosion resistance point of view; the performed welding operation was satisfactorily.},
}

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%0 Conference Proceedings
%T Weldment corrosion characterization of multi-pass hybrid GTAW-SMAW 2205 duplex stainless steel in 3.5%NaCl solution
%A M. Golyani
%A Moayed, Mohammad Hadi
%A A. Davoodi
%J ششمین سمینار الکتروشیمی ایران
%D 2010

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