This paper is in response to the discussion1 on the effect of rusted surfaces on the performance of electrochemical techniques used for the protection of steel from NH3-NH4NO3-H2O corrosion. An adequate list of references was given with the discussion and will not be expanded.
Figure 1 shows the test cell. It was constructed to retain vaporized NH3 and to permit the use of accepted electrochemical techniques. Data were obtained potentiostatically (automatically traversing the potential range at a rate of 100 mv/minute) and galvanostatically (manually adjusting the current every three minutes).
Three different surfaces of mill machined carbon steel test specimens were studied. Briefly, they were (1) annealed in an inert gas furnace at 915 ± 5 C, (2) heavily rusted in the NH3-NH4NO3-H2O solutions, and (3) partially cleaned by exposure to dilute...
