Hot Corrosion Studies on Bimetallic Combinations of Monel 400 and AISI 304 Subjected to Molten Salt Environment
Dissimilar joints of Monel 400 and AISI 304 are used widely in marine and offshore environments for the fabrication of heat exchangers, evaporators, piping and vessels as well as in the chemical, petrochemical, and power generation industries. An attempt was made to weld Monel 400 and AISI 304 by gas tungsten arc welding using ENiCu-7 and E309L filler wires. A comparative analysis was carried out on these weldments so as to examine the weldability, mechanical and metallurgical properties of the weldment. In addition, corrosion behavior of these weldments has been carried out on the dissimilar weldments in K2SO4 + NaCl (60%) molten salt environment at 600°C under cyclic conditions. The oxide scales formed on the various zones of the weldment have been characterized systematically using surface analytical techniques. Weld zone was found to be more susceptible to degradation than in base metals.
R. K. Devendranath et al., "Hot Corrosion Studies on Bimetallic Combinations of Monel 400 and AISI 304 Subjected to Molten Salt Environment", Advanced Materials Research, Vols. 383-390, pp. 3217-3222, 2012