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Effect of GTAW remelting on the corrosion performance of AISI 316L cladding
Author(s) -
Malhotra Dikshant,
Shahi Amandeep S.,
Gupta Kamal
Publication year - 2021
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202011666
Subject(s) - metallurgy , materials science , gas tungsten arc welding , corrosion , welding , cladding (metalworking) , dielectric spectroscopy , gas metal arc welding , x ray photoelectron spectroscopy , pitting corrosion , shielded metal arc welding , tungsten , austenite , electrode , electrochemistry , arc welding , microstructure , chemistry , physics , nuclear magnetic resonance
Gas tungsten arc welding (GTAW) process was used for remelting of the top clad layers of austenitic stainless steel 316L deposited on low‐carbon steel using gas metal arc welding (GMAW) process. Different electrochemical techniques were used for assessing and comparing sensitization and pitting corrosion performance of these clads (both in the as‐welded as well as aged condition), besides comparing their passive film characteristics. Top clad layer remelting was influential upto a penetration depth of around 2.34 mm. Aging of clads at 750°C/24 hr accelerated the precipitation of carbides, which suppressed partially due to their remelting as indicated by electron probe microanalysis studies. Due to this GTAW remelted clads exhibited a relatively lesser degree of sensitization and higher pitting corrosion resistance as compared to the conventional GMAW clads. X‐ray photoelectron spectroscopy studies revealed a relatively higher concentration of O, Cr, Ni, and Mo in the passive film of remelted clad surfaces than the conventional ones, which accounted for enhanced protectiveness of passive film on remelted surfaces as indicated by electrochemical impedance spectroscopy studies.