多孔性黒鉛電極を用いた定電位二次電解法による Cr-Mo 鋼中 M_2C の状態分析

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Based on the studies of electrochemical stability of Mo carbides, a new method for state analysis of M_2C in Cr-Mo steel was established. By use of this method, the precipitation behavior of carbides during creep rupture test was examined. Results obtained are as follows : 1) M_2C in Cr-Mo steel was electrochemically less stable than carbides of M_3C, M_7C_3 and M_<23>C_6, but almost as stable as M_6C. The electrochemical stability of carbides in Cr-Mo steel is in the following order M_2C≃M_6C<M_3C<M_7C_3≃M_<23>C_6. 2) M_2C can be selectively decomposed by the secondary electrolysis of primary electrolytic residues, prepared in the porous-graphite electrode, at the anode potential of +0.65V vs. SCE in 4% methyl salicylate-1% salicylic acid-2% LiCl-methanol. M_6C is also decomposed at the same condition. 3) The amount of M_2C can be determined by the dissolved amount of Mo after the secondary electrolysis. When M_6C is present in primary electrolytic residues, the amount of M_2C is calculated by subtracting the amount of Mo as M_6C, amount of which is calculated from the dissolved amount of Fe (Fe as M_6C) after the secondary electrolysis, from the dissolved amount of Mo by the same treatment. 4) The amount of M_2C precipitated during the creep rupture test is found to roughly correspond to the change in the master rupture strength of the specimens. The creep rupture strength is increased with increasing the precipitation amount of M_2C in these specimens.
社団法人日本鉄鋼協会の論文
1986-02-01

多孔性黒鉛電極を用いた定電位二次電解法による Cr-Mo 鋼中 M_2C の状態分析

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