A corrosion resistant weldable boss includes a body portion having a lower portion formed of a sintered powder, e.g., ferrous powder, which is readily welded to a vehicle structure surface. A capping member is sintered to an upper portion of the body portion and is formed of a corrosion resistant material such as sintered stainless steel powder. Also disclosed herein are processes for inhibiting corrosion of a sensor operating in a corrosive environment about a vehicle.