巻号一覧
22 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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橋本 宇一1971 年 22 巻 5 号 p. 208-215
発行日: 1971/05/01
公開日: 2009/10/30
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宮重 昂, 鈴木 良一1971 年 22 巻 5 号 p. 216-220
発行日: 1971/05/01
公開日: 2009/10/30
ジャーナル フリーAbrasion and acid resistances of Ni-W alloy plating obtained from citric acid baths were studied and they were compared with those of Ni plating and hard chrome plating.
The following results were obtained:
(1) Ni-W alloy plating, when rubbed with S15C (heat-treated), gave abrasion resistance higher than that of S15C (heat-treated) or Ni plating obtained from Watts bath. Heat-treated Ni-W alloy plating gave abrasion resistance nearly the same as that of hard chrome plating.
(2) Ni-W alloy plating gave higher abrasion resistance when rubbed with the same alloy rather than with a different alloy or metal.
(3) The abrasion in wet process (oil lubrication) was nearly the same as that in dry process.
(4) Ni-W plating obtained from citric acid baths gave specially high corrosion resistance against nitric acid.抄録全体を表示PDF形式でダウンロード (1037K) -
大友 清光1971 年 22 巻 5 号 p. 221-225
発行日: 1971/05/01
公開日: 2009/10/30
ジャーナル フリーIn general, the atmospheres for heat treatment are composed of O2, N2, CH4, CO, CO2, H2, H2O, etc. The process of oxidation-reduction by the bright heat treatment in these atmospheres is very complicated.
This paper discusses the oxides of plain carbon steel produced by various oxidizing gases at high temperatures.
The following results were obtained.
(1) Oxides of the specimens produced by each of O2, CO2, H2O (gas), and air were much different one another in microstructures.
(2) The X-ray diffraction patterns showed that the oxides of specimens heated in H2O (gas) contained FeO more than those heated in other gases.
(3) In general, the surface of specimens consisted of the layer of α-Fe2O3, or the layer of rich in α-Fe2O3. However, its content was gradually decreased with the increase of depth from the surface.
(4) As the results of line analysis of X-ray microanalyzer, it was shown that the oxygen content of the oxidized layer was increased in linear proportion toward the surface.抄録全体を表示PDF形式でダウンロード (1731K) -
アルミニウムのアルカリ性浴処理法の研究 (第4報)吉村 長蔵, 野口 駿雄, 広地 道明1971 年 22 巻 5 号 p. 226-232
発行日: 1971/05/01
公開日: 2009/10/30
ジャーナル フリーThis paper discusses the effects of the addition of carboxylic acids and inorganic salts on anodizing of aluminum in alkaline solutions.
AC Electrolysis of aluminum was made in NaOH (1.25×10-2mol) containing a salt of 0.1mol carboxylic acid (sodium tartrate or malonate). The thickest film (as much as about 3μ by microscopy) was produced on aluminum after 30min. at current density of 1 Amp/dm2.
When inorganic salts (0.05mol) were added to NaOH (0.1mol), pitting corrosion was observed after 30min. at 0.5Amp/dm2 in the presence of Cl- or ClO-, but a film was not produced in the presence of NO3-.
A thick film (about 3.5μ) was formed in NaOH containing Na2B4O2 to which F- or SO42- had been added.
The above experiments were also conducted for the black oxide film (formed in ferricyanide and chromate bath) which was previously reported.
In this ferricyanide-chromate system, the thickest (about 4.3μ) and hardest (12.9 by Marten's scratch hardness tester under load of 50g) film was obtained in NaOH (2.15×10-2mol) containing tartrate. Thus, better result was obtained by the addition of tartrate than the case of its no addition in NaOH of the same concentration.
A colored film was obtained by the addition of inorganic salts, but it was not obtained in the presence of halogen ions.抄録全体を表示PDF形式でダウンロード (898K) -
ニッケル基合金に対するクロム拡散メッキの研究 (第2報)原田 良夫, 根来 正明, 大前 寛1971 年 22 巻 5 号 p. 233-237
発行日: 1971/05/01
公開日: 2009/10/30
ジャーナル フリーThe effects of various treatment conditions such as H2 flow rate, time, particle size etc. on Cr diffusion coating by powder method were studied. The behavior of the surface layer was discussed with respect to the weight increase of specimens by reducing reaction.
The results obtained and considerations were as follows:
(1) Since a reversible relation was found between the generating reaction of CrCl2 and the reducing reaction for Cr deposition, the maximum value appeared in the H2 flow rate (partial pressure of H2) for the weight increase by the equilibrium between the both reactions.
(2) The reaction rate was higher with the decrease of Cr particle size in the diffusion agent and was determined by the step of gas diffusion. On the other hand, the rate was determined by the step of chemical reaction rate for coarse particles.
(3) Since the weight increase of specimens was caused by exchange reaction, not by reducing reaction, the specimens having higher content of iron showed smaller increase of weight.抄録全体を表示PDF形式でダウンロード (1240K) -
片桐 敏夫, 藤井 京子1971 年 22 巻 5 号 p. 238-246
発行日: 1971/05/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (4654K)
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