Abstract
The effects of Ni increase and then Al or Al and Y addition to this type of stainless steel on corrosion have been investigated in molten carbonate at 750°C under oxidant gas atmosphere. Ni increase in order to stabilize the microstructure had no influence on the corrosion resistance of this type of stainless steel. Al addition improved the corrosion resistance of this type of stainless steel and more improvement of corrosion resistance was observed at the stainless steel added with Y and Al. In this type of stainless steel, the corrosion rate on the test coupons coated with carbonate deposit obeyed parabolic rule, and then corrosion dipped in carbonate melt obeyed linear rule at this type of stainless steel. But the corrosion rate of the stainless steel added with Al or Al and Y nearly obeyed parabolic rule at both test cases. The mean diameter of corrosion products (mainly consisted of Fe) on the surface at the corrosion test coated with carbonate deposit grew proportionately to the t1/3. (t is test time.)
