巻号一覧
19 巻, 11 号
選択された号の論文の7件中1～7を表示しています
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Fe-Si系合金の腐食挙動に関する基礎研究 (第2報)三谷 裕康, 大西 正己, 八十島 亮1968 年 19 巻 11 号 p. 441-445
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーWith the object of determining the relationship between passivation behavior of Fe-Si alloys and silica formation on the alloy surfaces, anodic polarizations were conducted in IN H2SO4 for iron, 6 and 14% Si-Fe alloys, and pure silicon.
At about -0.2V (vs. S.H.E.), the anodic polarization curves of 6 and 14% Si-Fe alloys began to deviate from that of iron, resulting from silica formation on the alloy surfaces. Silica was not accumulated on the surface of 6% Si-Fe alloy, which scarcely hindered anodic dissolution of the alloy.
The silica formation and its removal from the surface were alternately repeated during anodic dissolution, and after the end of removal, a fresh surface was exposed.
The above phenomenon in the transition stage from active to passive state probably caused the prolongation of current oscillation on noble side and the delay of passivation. The silica accumulation on the surface of 14% Si-Fe alloy remarkably reduced the anodic dissolution of the alloy in active and passive states. Fayalite (Fe2SiO4) was also anodically polarized in 1N H2SO4 However, no evidence was shown that fayalite immediately controlled the passivation phenomenon of Fe-Si alloys.抄録全体を表示PDF形式でダウンロード (773K) -
アルミニウムの陽極酸化皮膜に関する研究 (第2報)大久保 敬吾1968 年 19 巻 11 号 p. 445-450
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーHardness and Wear Resistance
With the object of studying hard anodizing process at room temperature, hardness and were resistance of anodic oxidation coatings of aluminum from mixed bath of sulfuric-oxalic-citric acids were examined. The results of experiments were as follows.
(1) Good uniform coatings were not obtained from the electrolyte of sulfuric acid lower than 40g/l in concentration, but uniform coatings were obtained when sulfuric acid was mixed with oxalic acid.
(2) Hardness increased on addition of citric acid to sulfuric-oxalic acid bath. Particularly, the increase was greater when the coatings were thicker.
(3) Both hardness and wear resistance of the coatings from the above mixed bath were higher than those from other baths at room temperature, and it was found that the mixed bath was very effective for hard anodizing at room temperature.
(4) Hardness at the cross-section of thick coatings increased toward the inner part of layer; however, it slightly decreased near the boundary layer of substrate metal.抄録全体を表示PDF形式でダウンロード (1213K) -
シュウ酸浴からのクロムメッキの研究 (第1報)江口 晴一郎1968 年 19 巻 11 号 p. 451-456
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーThe author discussed the possibility of formation of bright chromium electrodeposits from chromic acid bath containing a great amount of saturated dicarboxylic acids, and the following conclusion was drawn.
A bright chromium deposit was not satisfactorily obtained from the plating bath of chromic acid containing a great amount of succinic or adipic acid. However, an excellent deposit was obtained from the bath, in which was dissolved a great amount of malonic or oxalic acid. In particular, the bath containing oxalic acid between them gave the deposit having higher throwing power.抄録全体を表示PDF形式でダウンロード (827K) -
立原 都, 白水 楠雄1968 年 19 巻 11 号 p. 457-461
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーIn this study, various chemical and electrographical methods were tested so that to determine porosity in the coatings on aluminium. Filter paper or desilvered photographic paper was used as the printing medium. Certain sensitive indicating reagent was dissolved in alcohol which contains, as electrolyte, a small quantity of NaCl dissolved in water. When the printing medium was pressed on the surface of a specimen, aluminium was preferentially dissolved. Aluminium ions were transfered through pores in the coating to the printing medium and reacted to form a colored product. It was found that aluminon and eriochromcyanine R were suitable agents for good printing.
It was revealed by optical microscopy, that the porosity prints obtained by this method were closely relative to the microstructure of the surfaces. The method was also applied to the determination of porosity in the anodized films. Also was it known by the corrosion test that the corrosion spots found on the specimen printed by the method are relatively in parallel with the printed spots.抄録全体を表示PDF形式でダウンロード (2753K) -
炎溶射法によるチタン酸バリウム皮膜コンデンサーの研究 (第6報)木村 生一, 内田 荘祐1968 年 19 巻 11 号 p. 462-465
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーAnalysis of the barium titanate coating produced by flame spraying was made by means of microanalyzer and thermal analyzer.
The oxygen-vacant lattices were present in the coating; but most of them disappeared when the coating was treated at high temperatures. Although it was treated at the temperature as high as 1, 400°C, some of them still remained on the interfacial layer between the coating and Ni substrate. The ratio of Ba: Ti in the coating was approximately equal to that in ceramic barium titanate.
Ceramic barium titanate showed a sharp endothermie peak at 110-120°C by differential thermal analysis; while, it was not observed in flame-sprayed product. However, when the coatings was heattreated at the temperatures of 1, 200 and 1, 400°C respectively broad and high peaks at 120°C were observed. The figures were evidently different from that of ceramic product.抄録全体を表示PDF形式でダウンロード (543K) -
クロメート処理の化学 (第2報)久松 敬弘, 北島 之夫1968 年 19 巻 11 号 p. 466-470
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーThe experimental study of the reduction of chromate by treating with zinc dust was carried out at 25°C under the condition of maintaining pH at constant values by the addition of H2SO4. The change in compositions of chromate solutions (0.5-2g Cr(VI)/l) with time was examined at constant values of pH (i.e. 2.0, 2.5, and 3.0).
As the results, it was shown that the reaction rate was determined by the process of surface reaction. When the concentration of Cr (VI) in the solution was higher, the reaction was slower. Linear relations were obtained between addition amounts of H2SO4 and amounts of Cr (VI) or Zn reacted. By the analysis of the above relations, it was found that the amount of H+ introduced by the addition of H2SO4 was about 90% as large as that necessary for the reduction reaction. The balance of 10% was accounted for by the supply of H+ mainly produced during the first step protolysis of Cr (III) aquo-ions.
The electrochemical measurement on zinc panels in the chromate solutions was also made.
On the basis of the electrochemical behavior of panels and reaction kinetics of zinc dust, there was provided a qualitative self-polarization diagram for the reduction reaction of chromate by treating with zinc.抄録全体を表示PDF形式でダウンロード (632K) -
野村 羊観1968 年 19 巻 11 号 p. 471-475
発行日: 1968/11/20
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (1536K)
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