Abstract
High Cr, Ni-base alloys seem to have excellent resistivity to ash-corrosion because of their high Cr contents. Their corrosion resistivities were investigated experimentally by means of a contact test with 80 mol% V2O5-20 mol% Na2SO4 mixed salt for 30 hr at 1100°C. Maximum penetrations of the corrosion were also confirmed by metallographic observation of specimens after the contact test. Effects of alloying elements on the ash-corrosion resistivity of the alloys were qualitatively estimated from the weight loss in regard to (a) the effect of Cr on Ni-Cr binary alloys containing 20 to 80 wt% Cr. (b) effects of Al, B, Co, Mn, Mo, Nb, Ta, Ti, V, W and Zr on 40 Cr-Ni alloy, and (c) effects of Al, B, C, Co, Cr, Mo, Ta and Ti on C-Alloy (36 Cr, 1 Al, 1 Ti, 4 Mo, 5 Ta bal. Ni).The results are sammarized as follows:(1) The corrosion loss of Ni-Cr binary alloy is rapidly decreased for the composition of more than 40% Cr.(2) Additions of Al, B, Zr and Ti improve the ash-corrosion resistivity of 40 Cr-Ni alloy. Amoung various alloying elements the effects of B and Zr are outstanding. Additions of Nb and V are deleterious. Intergranular corrosion with S was observed in 40 Cr-Ni, 40 Cr 10 Co-Ni and 40 Cr 5 Mn-Ni alloy.(3) Similar effects were obtained for C-alloy. The corrosion loss of C-0.1 B alloy, which is a typical high Cr, Ni-base alloy, was 1/3.5 of that of U-500 and 1/5 of that of S-816.It is important to consider the alloy composition with regard to ash-corrosion resistivity even in high Cr, Ni-base alloy.
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