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| THE ROLE OF NaCl IN HIGH TEMPERATURE CORROSION |
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| The effects of NaCl on high temperature corrosion was studied by using the salt-coated test method. The results showed that the corrosion rate of Nickel-base superalloys and aluminide coatings by NaCl at 900℃ is higher than that by Na2SO4. NaCl made the oxide film scale off rapidly, and the internal oxidation in alloys was very tensive. At the inital stage the corrosion rate of NaCl was so high that there was no hot corrosion incubation period observed on the weight gain-time curves. No chlorine was found in the oxide scale and near the scale-alloy interface, indicating that the chlorine did not diffuse into alloy as sulfur does in hot corrosion reaction. The chlorides of Ca and Mg are also corrosive in varying degrees according to the alkalinity of their cations. |
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