304 ステンレス鋼の高温水中における粒界応力腐食割れ防止に及ぼす酸素酸イオンの影響

概要

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Effect of oxyanions such as MoO_4^<2->, WO_4^<2->, and CrO_4^<2-> on the intergranular stress corrosion cracking (IGSCC) of Type 304 stainless steel in high temperature water was studied. The results obtained are as follows : 1) Addition of such oxyanion as MoO_4^<2->, WO_4^<2->, and CrO_4^<2-> suppresses IGSCC of sensitized Type 304 stainless steel in high temperature nondeaerated water. The effectiveness of the inhibitive action by the oxyanion is ranked in the order of MoO_4^<2->>WO_4^<2->>CrO_4^<2->. 2) The mechanism of IGSCC inhibition by MoO_4^<2->ion for sentized Type 304 stainless steel in high temperature water is considered as follows, i.e., the presence MoO_4^<2-> ion decreases the dissolution rate of Cr depleted zone at grain boundaries to the level of matrix by helping the formation of the Cr rich film containing MoO_3 or adsorbed MoO_4^<2-> ion on the surface of Type 304 stainless steel.
社団法人日本鉄鋼協会の論文
1983-12-01