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モリブデン酸ナトリウム溶融塩中におけるFe, Cr, Ni及びNi-Cr系合金の腐食挙動

Corrosion behavior of Fe, Cr, Ni and their alloys in sodium molybdate melts

永井 崇之  ; 菊池 光太郎*; 鹿野 祥晴*

Nagai, Takayuki; Kikuchi, Kotaro*; Kano, Yoshiharu*

モリブデン酸ナトリウム溶融塩におけるステンレス鋼及びNi-Cr系合金の腐食挙動を理解するため、Fe, Cr, Ni, SUS316, 55Ni-45Cr及びInconel 690の試験片を用いて、750$$^{circ}$$CのNa$$_{2}$$MoO$$_{4}$$又はNa$$_{2}$$Mo$$_{2}$$O$$_{7}$$における浸漬腐食試験を行った。浸漬試験の結果、試験片の材料組成中のCr含有量が増えるほど、腐食速度が低減されることがわかった。腐食速度が小さな値を示したNa$$_{2}$$Mo$$_{2}$$O$$_{7}$$溶融塩に浸漬したCr, 55Ni-45Cr及びInconel 690試験片の表面にCr$$_{2}$$O$$_{3}$$が形成されることを観察した。この試験片表面に形成したCr$$_{2}$$O$$_{3}$$がこれら溶融塩中での腐食挙動を低減すると推定される。

To understand the corrosion behavior of stainless steel and Ni-Cr alloys in sodium molybdate melts, the immersed corrosion tests of Fe, Cr, Ni, SUS316, 55Ni-45Cr, and Inconel 690 specimens were carried out in Na$$_{2}$$MoO$$_{4}$$ and Na$$_{2}$$Mo$$_{2}$$O$$_{7}$$ melts at 750 $$^{circ}$$C. The results of the immersed test, it was found that the corrosion rate decreased with an increase of chromium content in chemical composition of specimens. It was observed that Cr$$_{2}$$O$$_{3}$$ formed on the surface of Cr, 55Ni-45Cr, and Inconel 690 specimens by immersed in Na$$_{2}$$Mo$$_{2}$$O$$_{7}$$ melt, which corrosion rates were low in the melt, and we presumed that this Cr$$_{2}$$O$$_{3}$$ on the surface controlled the corrosion behavior of their material in the melt.

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