巻号一覧
9 巻, 5 号
選択された号の論文の6件中1～6を表示しています
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周東 茂夫, 山中 清水, 川瀬 照久1966 年 9 巻 5 号 p. 338-345
発行日: 1966/05/25
公開日: 2009/01/30
ジャーナル フリーThe effects of corrosion control by crude desalting, alkaline neutralizers and corrosion inhibitors in crude oil distillation unit were investigated by charging the laboratory distillation apparatuses and topping plant (40, 000 BPSD) with Middle East crudes.
Following results were obtained;
(1) Desalting contributes little to corrosion protection unless the salt content of the crude oil is decreased sufficiently.
(2) When stripping steam is added to the crude unit, the generation of hydrogen chloride tends to increase with the increase of salt in the crude oil and the rise in distillating temperature. However, appreciable amount of hydrogen chloride is generated even with no stripping steam.
(3) When injecting corrosion inhibitors to overhead lines better results are obtained when the pH in the overhead water is maintained at 7.0 and ammonia injection is employed than when the pH is of a lower value.
(4) Concerning the injection of alkaline neutralizers into the crude oil charge line;
(a) Both caustic soda and sodium carbonate are effective to corrosion control, however, the effect is greater when larger volume is injected after dillution.
(b) The injection of caustic soda plus aqueous ammonia into the crude oil is further effective than injecting caustic soda alone.抄録全体を表示PDF形式でダウンロード (569K) -
滝口 周一郎, 石津 善雄, 金指 元計1966 年 9 巻 5 号 p. 346-353
発行日: 1966/05/25
公開日: 2009/01/30
ジャーナル フリーThis paper reports on corrosion in the crude oil atmospheric distillation plant; corrosion rates with various kind of crude oils, effect of extension of materials by tensile force on corrosion rate, and the effect of corrosion inhibition by ammonia and inhibitor injected in the distillation plant.
Gach Saran Crude gave about twice as much corrosion as Arabian Crude at the top of the distillation column. Gach Saran Crude was also more corrosive than Arabian Crude in other sections of the column. In the case of Gach Saran Crude, the gasoline fraction was most corrosive and the corrosion rate in the vapor zone (including the condensing zone) was three times as large as that in the liquid zone.
Injection of ammonia and inhibitor had a marked effect in reducing corrosion, and the corrosion rate in the gasoline fraction decreased to about 1/4 of that using only steam injection.
18Cr-12Ni-2Mo stainless steel showed the highest corrosion resistance, 18Cr-8Ni stainless steel being the second. In low alloy steels, an increasing amount of Cr improved resistance to general corrosion, but these alloys were susceptible to pitting. Among Cu alloys, BsTF-2 was relatively resistant to both general and pitting corrosion.
Effect of 20% extention of specimens by tensile force was not established, although data on weight loss, surface roughness and microscopic structure were examined.抄録全体を表示PDF形式でダウンロード (1401K) -
宇都 善満, 山崎 大蔵, 新川 利和, 富重 朗機1966 年 9 巻 5 号 p. 354-359
発行日: 1966/05/25
公開日: 2009/01/30
ジャーナル フリーStress corrosion cracking of austenitic stainless steels by sulfur compounds has been investigated and the following results are obtaind;
(1) Austenitic stainless steels were subjected to stress corrosion cracking in solution of sulfurous acid and solution of sulfurous acid and polythionic acids when the Cr impoverished zone existed around the grain boundaries.
(2) Sulfite solution or polythionates solution did not induce the stress corrosion cracking failure.
(3) The stress corrosion cracking were observed to be intercrystalline by optical and electron microscopy.抄録全体を表示PDF形式でダウンロード (2912K) -
平松 剛毅, 野中 正浩1966 年 9 巻 5 号 p. 360-365
発行日: 1966/05/25
公開日: 2009/01/30
ジャーナル フリーThe stress corrosion cracking of aluminum brass in fresh water has been investigated. Specimens used are aluminum brass plates (BsTF3) and are stressed by the application of bending. The corrosion medium was 30ppm NaCl aqueous solution, to which are added ammonium ion (1.44ppm as NH4+), oxygen (saturated) and hydrogen sulfide. The anodic polarization test method was used.
The results obtained in this study are summarized as follows;
(1) Stress corrosion cracking of aluminum brass in fresh water did not occur in the medium free from dissolved oxygen, even if ammonium ion existed and neither in the medium free from ammonium ion, even if dissolved oxygen is saturated. Co-existence of ammonium ion and dissolved oxygen in fresh water resulted in stress corrosion cracking.
(2) Stress corrosion cracking of aluminum brass also occured in fresh water containing hydrogen sulfide.抄録全体を表示PDF形式でダウンロード (3561K) -
鳥羽 厚1966 年 9 巻 5 号 p. 366-370
発行日: 1966/05/25
公開日: 2009/01/30
ジャーナル フリーThe residual stress and stress corrosion cracking of aluminum brass condenser tubes were studied by means of strain meter and stress corrosion cracking test.
The following aspects have been observed.
(1) Large tensile stress remains on the inner surface of the brass tube in the vicinity of the expanded tube joint.
(2) The stress has a relationship with the clearance between tube and tube sheet before the expanding operation.
(3) Closely fitted test pieces reduced the stress and showed good results in stress corrosion cracking test using aqueous ammonia.抄録全体を表示PDF形式でダウンロード (2496K) -
川口 政二1966 年 9 巻 5 号 p. 371-373
発行日: 1966/05/25
公開日: 2009/01/30
ジャーナル フリーTaking the different factors, readily controlable in the laboratory, between polluted sea water and clean sea waters, which cause extraordinary corrosion to aluminum brass, a rotary corrosion test was conducted, using synthetic sea water. The following conclusions were derived.
(1) A general study on the effect of pH, sea water concentrations, NH4+ and S2- upon 90 Cu-10 Ni, 70 Cu-30 Ni and aluminum brass respectively was carried out and the results indicate the effect of S2-to be the greatest.
(2) The corrosion effect of synthetic sea water (pH 7.0-8.3) on aluminum brass was studied after adding NH4+ and S2- to the solution. Experiments indicate a weight loss of 5.5 times when 5mg/l of NH4+ was added to the solution of pH 8.3 and 19 times when 0.25mg/l of S2- was added.抄録全体を表示PDF形式でダウンロード (1071K)
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