Improvement Of Corrosion Resistance Of Gray Cast Iron Components By Cladding With Gas Metal Arc Welding

Monday, May 7, 2018: 4:30 PM
Sarasota 1-2 (Gaylord Palms Resort )
Mr. Ben Heider , TU Darmstadt, Center for Structural Materials, Darmstadt, Germany
Mr. Eric Gonzales , RWTH Aachen, Welding and Joining Institute, Aachen, Germany
Mr. Stephan Wieland , RWTH Aachen, Welding and Joining Institute, Aachen, Germany
Dr. Georg Andersohn , TU Darmstadt, Center for Structural Materials, Darmstadt, Germany
Dr. Jörg Ellermeier , TU Darmstadt, Center for Structural Materials, Darmstadt, Germany
Mr. Rahul Sharma , RWTH Aachen, Welding and Joining Institute, Aachen, Germany
Prof. Matthias Oechsner , TU Darmstadt, Center for Structural Materials, Darmstadt, Germany
Prof. Uwe Reisgen , RWTH Aachen, Welding and Joining Institute, Aachen, Germany
Cladding with duplex stainless steel by gas metal arc welding is applied to improve the corrosion properties of gray cast iron components. The influence of process parameters such as shielding gas and preheating temperature leads to variations of the cladding layers. Dilution and microstructure are investigated with metallurgical and analytical methods. The corrosion behavior of cladding layers as compared to rolled duplex stainless steel is studied with electrochemical and immersion tests. Metallographic analysis is used to investigate the corrosion mechanisms as well as to identify the various phases which result from different amounts of heat input and different shapes of arc penetration profile during welding. The dilution of cladding layers and the diffusion of gray cast iron elements – especially carbon, chromium and nitrogen – influences the corrosion characteristics. In conclusion, an improvement of the corrosion behavior of gray cast iron by cladding with duplex stainless steel was achieved.
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