材料と環境 Vol. 63 (2014), No. 3
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材料と環境 Vol. 63 (2014), No. 3
水素脆化研究における水素検出・計測技術の展開
春名 匠
pp. 76-83
DOI:
10.3323/jcorr.63.76抄録
Hydrogen embrittlement has been one of the biggest issues for usage of high-strength structural metals such as steels, Al alloys, Ti alloy and so on. The phenomenon has been figured out through the age, and has not been completely overcome yet. One of the reasons was that there were quite few techniques to detect hydrogen because hydrogen is the lightest and the smallest in the atoms. Recently, the techniques to detect hydrogen has been developed and advanced, and then provided important information on the state, the local position and the local concentration of hydrogen in the metals. This paper aims at the review of the techniques for detecting hydrogen associated with hydrogen embrittlement of the structural metals.
Al-Mg合金製溶接構造物の局部腐食生起が供用に支障をきたさないための管理
中山 元, 榊原 洋平
pp. 93-97
DOI:
10.3323/jcorr.63.93抄録
The structure with welded joints made from aluminum- magnesium alloy series 5083 is used without painting on the outdoors. Therefore, corrosion damage management is required for the structure not to suffer localized corrosion during the practical use.
沸騰硝酸中における310ステンレス鋼の粒界腐食に及ぼすリンの局所偏析の影響
小松 篤史, 本岡 隆文, 牧野 政, 野際 公宏, 上野 文義, 山本 正弘
pp. 98-103
DOI:
10.3323/jcorr.63.98抄録
The effect of phosphorous on intergranular corrosion of type 310 stainless steel at transpassive potential was investigated using phosphorous added ultra high purity type 310 stainless steel. Intergranular corrosion depth was measured by scanning electron microscopic observation. Grain boundaries were observed using three dimensional atom probe. Intergranular corrosion was observed on phosphorous added stainless steel. The sample heat treated at 600℃ showed severe integranular corrosion morphology. Observation by three dimensional atom probe revealed that grain boundary with high dissolution rate had segregated zone of chromium and phosphorous about 5nm in width, on the other hand, grain boundary with low dissolution rate had no segregated zone. From these results, it is suggested that intergranular corrosion of phosphorous added type 310 stainless steel at transpassive potential is affected by segregation of phosphorous and chromium along grain boundaries.
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