金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
29 巻, 1 号
選択された号の論文の7件中1~7を表示しています
  • 上村 揚一郎
    1978 年 29 巻 1 号 p. 10-15
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 青木 公二, 鷹野 修, 石橋 知, 林 忠夫
    1978 年 29 巻 1 号 p. 16-20
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    A study of electroless nickel-tin-phosphorus alloy plating from acidic bath has been made with reference to the effect of tin content on the deposition condition and the corrosion behavior of the alloy. It was found that the tin content in the deposits increased up to 2.8% and the deposition rate decreased with increasing amount of stannic chloride in the bath. Also, the grain size of the nickel deposits obtained was found to become smaller with increasing tin content. The corrosion resistance of the nickel-tin-phosphorus deposits in IN sulfuric acid was enhanced by increasing tin content in the deposits. Nickel-tin-phosphorus deposits obtained from the acid type bath was found to be more stable than that obtained from the ammonia alkaline bath.
  • 清水 保雄, 田辺 良美
    1978 年 29 巻 1 号 p. 21-26
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    Electrodeposited Cu-Pb alloys from citrate-, sulfamate-, and tartrate baths were investigated by means of TEM, SEM and X-ray diffraction. Electron diffraction and X-ray diffraction analyses revealed that the electrodeposited Cu-Pb alloys formed a supersaturated solid solution in Cu side even at the concentration of about 5-6 at. % Pb. It was also found that both Cu rich and Pb rich solid solutions coexisted in a range of about 9-82 at. % Pb, and that 93 at. % Pb alloy showed no other diffraction line than those due to the Pb rich solid solution. The lattice parameter of the Cu rich solid solution in about 5-6 at. % Pb alloys was 3.63-3.64Å, but was reduced to 3.61-3.62Å in a range of about 9-82 at. % Pb. That of the Pb rich solid solution was 4.94-4.96Å. TEM observation revealed that the growth of these electrodeposited alloy films took place in the nucleation and growth process, and the films contained many micro-crystallites in size of several hundreds of Å, and also, in such a case, that both the Cu rich and Pb rich solid solutions coexisted in a film, ordinarily the crystallites were deposited by being uniformly mixed. The morphological observation using SEM showed that the surface of the films became coarse with an increase in Pb content. CuKα-, and PbMα-X-ray images indicated that Cu and Pb atoms were uniformly distributed in the deposits. Both phases of the Cu rich and Pb rich solid solution were precipitated from each of the 5 and 93 at. % Pb electrodeposits by heat treatment at 250°C, for 1hr, in 1×10-5mmHg.
  • 黒田 孝一
    1978 年 29 巻 1 号 p. 27-32
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    The analysis of Lissajous' figures obtained from voltage and electric current-time curves measured by using 1-P all wave rectifier on anodizing Al has been studied in various electrolytes. Both a small and a large peak in the current wave form on anodizing Al in 1M H2SO4 were found on a synchroscope as the voltage increased. The former (Ic) was the charge current for forming a barrier layer and the latter (Ip) was ionic current for forming a porous film. The voltage, at which the current showed zero ampere, coincided with the voltage (Eb) refered to the barrier layer. Lissajous' figures on anodizing Al in H2SO4 and C2O4H2 showed a figures for the porous film formation having a Ip peak on the left side. In anodizing Al in 5% ammonium borate, Ip decreased immediatly via a maximum with increasing voltage and Ic only was observed to be stabilized after a few seconds. Lissajous' figure in this state was smaller in size and had many small peaks. On the other hand, on anodizing Al in conc. HNO3, only Ip was observed in the current wave and Lissajous' figures were not clear. On anodizing Al in monobasic acids, the barrier layer growth followed by the formations of porous layer was not recognized. The wave form in the case of anodic dissolution of Cu in H2SO4 was similar to the one of anodizing of Al in HNO3. Reanodizing Al in HNO3 (10V) after anodizing in H2SO4 (20V) was possible, but the voltage (Eb) refered to the barrier layer decreased with elapsed time. After a long time reanodizing (10V) in HNO3, the porous film was removed due to the dissolution of the barrier layer.
  • 福田 芳雄
    1978 年 29 巻 1 号 p. 33-37
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    A6063 aluminum alloy was anodized in binary acid solutions, viz. tartaric acid, malic acid or malonic acid mixed with oxalic acid, for 20min by applying a constant c.d. of 5.65A/dm2 at 40 to 60°C. In the electrolytic bath containing only one component, uniform oxide film was not formed. Bath voltage during anodizing in the tartaric or malic acid bath was high (above 220V with 1mol/l and above 150V with 3mol/l), whereas in malonic acid bath it was relatively low (80-85V with 1mol/l). When 0.15-0.2mol/l oxalic acid was added to the 1mol/l baths of these acids, uniform, integral-colored, crack-free and hard oxide films of Hv 300-470 were formed at 40 to 50°C. The final voltage was lowered by the addition of oxalic acid in the baths of tartaric acid and malic acid (105-135V and 120-140V respectively), whereas in the bath of malonic acid the final voltage was scarcely changed with the addition of oxalic acid or slightly higher (78-95V). With increasing oxalic acid concentrations and elevating temperatures, the number of micropores of the film increased, leading to the decrease in hardness values.
  • 渡辺 孝, 川崎 博信, 垂水 英一, 門 智
    1978 年 29 巻 1 号 p. 38-42
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
    It has been found that corrosion resistance of zinc could be improved by the treatment with an aqueous solution of tannic acid. Based on this fact, the effect of tannic acid on the corrosion inhibition of zinc was thoroughly investigated. In the treatment of zinc with tannic acid solution, the thickness of the protective film formed was almost proportional to the treatment period; nevertheless, temperature of the solution had further pronounced effect on the film formation rate. From the viewpoint of stability and appearance of the film, thickness of the film was preferably to be less than 1g/m2. Actually, the film of 0.5g/m2 in thickness was capable of with standing the salt spray test for 24 hours. Among the tannic substances, tannins of the hydrolysable type exclusively exhibited the corrosion inhibition effect on zinc; while, with tannins of the condensed type, the protective film could not be formed.
  • 本多 健一
    1978 年 29 巻 1 号 p. 43-46
    発行日: 1978/01/01
    公開日: 2009/10/30
    ジャーナル フリー
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