Evaluation of Corrosion Resistance of GTAW API 5L X60 Steel / 2205 Duplex Stainless Steel Dissimilar Welds Produced with Different Heat Inputs.

Document Type : Original Article

Authors

1 Department of Metallurgical & Materials Engineering, University of Lagos, Nigeria.

2 Department Of Metallurgical & Materials Engineering, University of Lagos, Nigeria.

3 Department Of Metallurgical & Materials Engineering, University of Lagos

Abstract

In the present study, API 5L X60 / 2205 DSS dissimilar weld joints were fabricated using gas tungsten arc welding (GTAW) with ERNiCrMo-3 as the filler-metal. The influence of welding heat input (low (0.73 - 0.88 kJ/mm), medium (1.3 - 1.7 kJ/mm), high (2.1 - 2.8 kJ/mm) on the resistance of the welded joints to corrosion was investigated. Pitting corrosion resistance of the welded joint was assessed using ASTM G48 immersion test. Electrochemical impedance spectroscopy, potentiodynamic polarisation and cyclic polarisation were further employed to evaluate the corrosion resistance of the fusion zone of the welded joints in 3.5 wt. % NaCl solution. The result showed that welded joints produced at medium heat input range exhibited the highest resistance to pitting and uniform corrosion. On the other hand, welded joint produced at high heat input exhibited the lowest corrosion resistance. These results were discussed in the light of passivity of the fusion zone of the welded joints and the presence of secondary phases precipitates in its microstructures.

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International Journal of Materials Technology and Innovation
Volume 3, Issue 3
December 2023
Pages 33-42

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