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Electronic Resource
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SAND Report: SAND80-8856, December 1980.
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Library's review
ABSTRACT:
The corrosion behavior of Type 304 stainless steel in molten NaN03-KN03 was studied at temperatures between 600°C and 350°C using thermal convection loops. Corrosion rates were somewhat less than 2.5 x 10-2 mm/year (1 mil/ year) at the maximum temperature. Two corrosion processes were
The corrosion behavior of Type 304 stainless steel in molten NaN03-KN03 was studied at temperatures between 600°C and 350°C using thermal convection loops. Corrosion rates were somewhat less than 2.5 x 10-2 mm/year (1 mil/ year) at the maximum temperature. Two corrosion processes were
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observed, formation of oxide scales and depletion of chromium from the alloy. Oxidation products generally consisted of at least two layers, a layer of Fe304 over an iron-chromium spinel. In addition, a complex oxide was detected which appeared to be a double oxide of iron and, a salt impurity, magnesium. Chromium accumulated as a soluble product in the melt but thermal gradient mass transfer was not observed. Chromium depletion kinetics were approximately parabolic with time suggesting a diffusion controlled process. Autogenous weldments experienced somewhat more corrosion in the heat-affected zone than either the fusion zone or the parent alloy. Show Less