巻号一覧
24 巻, 3 号
選択された号の論文の10件中1～10を表示しています
- |<
- <
- 1
- >
- >|
-
低濃度クロム酸溶液からのクロムメッキに関する研究 (第5報)小西 三郎, 只腰 光章, 久保田 保隆1973 年 24 巻 3 号 p. 132-138
発行日: 1973/03/01
公開日: 2009/10/30
ジャーナル フリーActivities of fluoride and foluorosilicate in chromium plating baths were studied by using a fluoride electrode, and the following results were obtained.
(1) In chromium plating baths, the activity of fluoride was less than that of the additional fluoride. The reason for this was that F-+H+→HF.
(2) The activity of fluoride well corresponded with the value calculated from pH of the plating bath and ionization constant of HF, 7.2×10-4.
(3) The activity of fluorosilicate was quite the same as that of fluoride at concentrations of less than 10-3mol/l or at higher pH. The reason was that the fluorosilicate was completely decomposed at low concentrations, and it was decomposed to fluoride at higher pH as follows:
SiF62-+6OH-→6F-+[Si(OH)6]2-
(4) The difference between activities of fluoride and fluorosilicate under other conditions was due to the formation of complex salt by fluorosilicate.抄録全体を表示PDF形式でダウンロード (957K) -
流電陽極用アルミニウム合金に関する研究 (第8報)佐藤 栄一, 田村 寿康, 岡部 泰二郎1973 年 24 巻 3 号 p. 139-144
発行日: 1973/03/01
公開日: 2009/10/30
ジャーナル フリーThe pitting and protection potentials for pure aluminum in 0.5N NaCl solutions (pH=4, 6, 8, 10, and 12) were investigated by means of an apparatus consisting of a potentiostat and a high sensitive recorder.
The results obtained were as follows.
The pitting potentials determined by polarization curves of aluminum in 0.5N NaCl solutions (pH=4, 6, and 8) showed two kinds of different values.
(1) In the solution of pH=4, the 1st pitting potential was -1.15V (vs. S.C.E.) and the 2nd one was -0.73V (vs.S.C.E.); and the protection potential was -1.20V (vs.S.C.E.).
(2) In the solution of pH=6, the 1st pitting potential was -1.16V (vs.S.C.E.) and the 2nd one was -0.72V (vs.S.C.E.); and the protection potential was -1.20V (vs.S.C.E.).
(3) In the solution of pH=8, the 1st pitting potential was -1.16V (vs.S.C.E.) and the 2nd one was -0.70V (vs.S.C.E.); and the protection potential was -1.16V (vs.S.C.E).
(4) The pitting and protection potentials for aluminum in 0.5N NaCl solution (pH=10) were -0.70V (vs.S.C.E.) and -1.16V (vs.S.C.E.), respectively.
(5) The pitting and protection potentials for aluminum in 0.5N NaCl solution (pH=12) were -0.52V (vs.S.C.E.) and -1.89V (vs.S.C.E.), respectively.抄録全体を表示PDF形式でダウンロード (795K) -
竹内 栄一1973 年 24 巻 3 号 p. 144-150
発行日: 1973/03/01
公開日: 2009/10/30
ジャーナル フリーIn this paper, the dry-sliding wear properties of SKD 11 and SKH 9 under conditions of high pressure and low velocity are discussed; these samples are industrially utilized as mold forming materials in cold forming. Particularly, these alloy steels were used as stators, while sulfurized or phosphated low carbon steels were used as rotors cooperating with the side stators.
The results showed that in the range of contact pressure of 500-1500kg/cm2 and sliding velocity of 0.05-1.00m/sec., the surface layers of phosphated rotors broke away at their earlier stage of wear, which resulted in metal transfer due to adhesion.
Whereas, little adhesion was observed on the sulfurized rotors. A part of porous sulfurized layers spalled away as wear powder, which adhered to the sliding surface of counter experimental piece. Then, the wear loss between the two sulfurized layers grew remarkably less.
It was also observed that when the wear ratio varied in the velocity-wear property curve, the wearing mechanisms were nearly identical with those mentioned above.
It was further observed that the wear of underhardened material was slightly larger than that of ordinarily quenched and tempered one, because the hardness of the former was much lower than that of the latter.抄録全体を表示PDF形式でダウンロード (3000K) -
重金属イオンを含む排水およびスラッジの処理に関する研究 (第1報)柏原 太郎, 加藤 敏春, 有馬 純治1973 年 24 巻 3 号 p. 151-154
発行日: 1973/03/01
公開日: 2009/10/30
ジャーナル フリーThis paper describes the results of experiments on the coagulation mechanism of metal ion and oxidation reactivity of metal hydroxide at high temperatures with respect to chromium ion (Cr3+) and chromium hydroxide causing public discussion in waste water treatment and sludge disposal.
The following results were obtained:
(1) The water content of chromium hydroxide was maximum when the coagulation of chromium ion occurred at pH of 7-9. (It was less when the coagulation occurred at higher or lower values). As the result, the apparent specific gravity of chromium hydroxide produced at pH of 7-9 was minimum and its sedimentation rate was also minimum.
(2) Na content of chromium hydroxide increased with the increase of pH value at which coagulation occurred. Therefore, the Cr6+ content of the burned chromium hydroxide was also greater with the increase of pH value at which coagulation occurred.
(3) The Cr6+ content of the burned chromium hydroxide containing Na was maximum at about 300°C. However, when the oxidation temperature was higher than that, the Cr6+ content decreased owing to its decomposition.抄録全体を表示PDF形式でダウンロード (563K) -
プラスチックメッキの密着機構に関する研究 (第3報)矢島 勝司, 神戸 徳蔵1973 年 24 巻 3 号 p. 155-157
発行日: 1973/03/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (992K) -
超高エネルギ密度ビーム熱源とその応用 (下)荒田 吉明1973 年 24 巻 3 号 p. 158-169
発行日: 1973/03/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (3462K) -
1973 年 24 巻 3 号 p. 194a
発行日: 1973年
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (431K) -
1973 年 24 巻 3 号 p. 194b
発行日: 1973年
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (431K) -
1973 年 24 巻 3 号 p. 194c
発行日: 1973年
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (431K) -
1973 年 24 巻 3 号 p. 194d
発行日: 1973年
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (431K)
- |<
- <
- 1
- >
- >|