著者

金子 秀夫 村上 毅 池内 準

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.32, no.10, pp.982-987, 1968 (Released:2008-04-04)

参考文献数

3

被引用文献数

1 1

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The process of carburization is the oldest and has been most extensively employed in industry as a method of case hardening of steels. The progress in the carburization technique, however, has not been extremely rapid. Therefore a new method with higher rate of penetration and better quality of case is extensively craved for. To find a solution of this problem, electrodischarge carburization has been conducted by the present authors to combine electrodischarge heating and the carburizing action in a special electrolyte. This is a method of case hardening of steels in a electrolyte that contains the chemicals required to produce a case comparable with one resulting from liquid carburization. This provides a convenient method of carburization, with low distortion and with considerable high rate of penetration and uniformity of control of the case.The best carburizing conditions obtained in the present study are as follows:electrolyte: ethleneglycol saturated with sodiumchlorideapplied voltage: 150 V DCcarburizing time: 1∼5 mincase depth: 0.2∼0.3 mmhardness of the case: >Hv 850

著者

南條 弘 倉田 良明 浅野 修 佐多 延博 池内 準 真田 徳雄

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.41, no.3, pp.169-174, 1992-03-15 (Released:2009-11-25)

参考文献数

11

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Field tests were done at Onikobe and Minamikayabe geothermal sites and the effect of flow velocity on flow-assisted corrosion damage was clarified as follows: Corrosion rates of stainless steels were very small in the alkaline liquids of Onikobe brine A and Minamikayabe brine, and the flow effect was also very small. The rates of mild steels were large in short test duration, but decreased to 0.01mm/y after 46 hours. The flow velocity at which corrosion rates of mild steels reached to the maximum was larger in Minamikayabe geothermal brine than in Onikobe brine A, because the former contained hard solid particles and less dissolved oxygen than the latter. In Onikobe acid geothermal brine B, corrosion rates of mild steels increased with velocity at 0-0.5m/s, but were constant between 0.5m/s and 4.1m/s. However, in case that the brine contained 5mg/l dissolved oxygen, the rates increased with velocity beyond 0.5m/s.