High Temperature Slag Corrosion of Metallic Materials: Part 1—Theoretical Considerations of Slag Induced Corrosion

An investigation of the theoretical concepts of corrosion in simplified laboratory slags was undertaken. Two distinct types of high temperature corrosion, one influenced by high vanadium-sodium slags and the other resulting from a sulfate-chloride, nonvanadium slag, were studied. Corrosion characteristics were studied in oxygen and nitrogen environments at one atmosphere over a temperature range of 1100 to 1700 F. Conclusions after testing were that the most corrosive scale resulted from contamination by 79 percent V₂O₅ + 21 percent NaVO₃; catastrophic oxidation began at temperatures between 1400 and 1560 F; accelerated corrosion by vanadium slags did not occur in nitrogen atmosphere; corrosion by sulfate-chloride slag was more severe in nitrogen than in oxygen. Overall, it was determined that slag environments induced gross corrosion of surfaces. 4.2.3