金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
30 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
  • 千葉 淳
    1979 年 30 巻 11 号 p. 576-583
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 内藤 邦子, 出口 和夫, 久保 光康, 黒崎 重彦
    1979 年 30 巻 11 号 p. 584-590
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
    For the purpose of improving the adhesion of polymer coatings to metal surfaces, composite substrate coatings of zinc containing phenol resin particles, originally suspended in the plating bath by using surfactants, have been proposed. The plating conditions, such as the concentration of suspended particles, current density, and relative velocity between the cathode and the electrolyte, which exert significant influences to the amount of particles contained in the composite films, have been investigated. Deposition of the resin particles is interpreted that the particles are initially adsorbed on the cathode by the electrophoretically, but only the particles strongly adsorbed by electrostatic force are embedded in the growing metal deposit, as shown in the Guglielmi's model. That is not the case, however, when the plating solution is vigorously agitated. The amount of particles codeposited in the composite film depends on the probability of the collision of particles with the cathode. From the values of bond strength and the observations of the surface by using SEM, the adhesion of polyethylene and polyamide layers to the composite substrate coatings are explained in terms of the increased surface area of phenol resin particles entrapped in the composite film surfaces, and the roughness of the composite surface.
  • 糸井 康彦, 佐藤 栄一
    1979 年 30 巻 11 号 p. 591-594
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
    The corrosion resistance of chemically treated aluminum was investigated from following experiments in 0.5M NaCl at 80°C. Changes of the film structure were revealed from the weight gain of specimens (γl-layer) during immersion in 0.5M NaCl at 80°C. IRRS measurment and SEM observation showed the composition of the film and the surface appearance of the specimens respectively. The corrosion resistance of chemically treated aluminum and aluminum alloys have been examined by measuring the polarization curves.
    These results showed as follows; The weight of γl-layer on 99.99% Al and Al-Mg alloy were greater than that of Al-Zn alloy. In such a corrosive condition even at 80°C, the pitting potential of 99.99% Al and Al-Mg alloy was more noble than that of Al-Zn alloy. These results indicated that the corrosion resistanse of the specimens was responsible for the formation of the γl-layer. IRRS of the oxide film proved the formation of the Al2O3 containing amorphous hydroxide when specimens was immersed in 0.5M NaCl at 80°C for long duration. SEM observation revealed that the film grew into needle like microscopic structure with increasing immersion time in 0.5M NaCl at 80°C.
  • 鈴木 隆三, 柴田 孝夫, 長坂 秀雄
    1979 年 30 巻 11 号 p. 595-599
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
    Spontaneous electrode potential, polarization behavior, and corrosion rate of superplastic Zn-22% Al alloy in a 3% NaCl solution were examined and compared with those of Zn and Al. The values of the spontaneous electrode potential of the alloy markedly shifted with a period of 20-30minutes in the directions of the noble and the base potentials alternately. In the anodic polarization process, Zn in the alloy dissolved preferentially, while the increase in polarizing current was retarded by the oxide films formed on the surface of Al matrix. In the cathodic polarization process, a tendency of passivation appeared. The corrosion rate was estimated from the intersection of the local anodic and local cathodic polarization curves. These were obtained by the measurments of the external electric current passed, and of the quantity of metals electrolytically dissolved during the potentiostatic polarization. The estimated values of corrosion rate of Al, Zn, and Zn-22%Al alloy were about 2, 17, and 10μA/cm2, respectively.
  • 福島 久哲, 秋山 徹也, 中小路 尚匡, 東 敬
    1979 年 30 巻 11 号 p. 600-605
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
    The partial current-cathode potential curves for Ni deposition were measured by the potentiostatic method in baths containing various amounts of molybdate. The results indicate that Ni is depolarized by molybdate at lower concentrations of this ion but it is polarized at higher concentrations. The depolarization effect was explained as being due to the adsorption of molybdate catalyzing the Ni deposition according to the mechanism previously proposed for S-compound additives. The polarization effect observed at higher molybdate concentrations is resulted from the formation of intermediate lower oxides of Mo during electrodeposition of alloys. The resistance of the oxide films was measured by the interrupter method.
  • 黒田 孝一
    1979 年 30 巻 11 号 p. 606-609
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
    When Al is anodized in dilute (1M) malic acid, the surface of Al is covered with barrier layer, where as it is covered with porous film when Al is anodized in a high concentrated (5M) and high temperature malic acid. The discrimination between the growth of barrier layer and porous film is not so difficult, because their Lissajous' figures obtained in oscilloscope by using 1-P all wave rectifier on anodizing of Al is appearently different. The voltage, at which the current wave form showed zero, coincided with the voltage (Eb) referred to barrier layer. Eb on anodizing of Al in a concentrated malic acid at 20°C indicated a high value. When anodizing of Al is done under the condition of such a low temperature, the porous film on Al did not grow. However, under the condition of high temperature, ionic current (Ip) for the formation of oxide film was increased and the porous film grew on the surface of Al. The reason of the growth was due to that the voltage of barrier layer showed a low value at high temperature, because the barrier layer became thinner by chemical dissolution. When Al-Si alloy was anodized in 1M H2SO4 with a constant voltage, 20V and 40V of peak voltage (Ep) for anodizing, the Lissajous' figures showed a form of barrier layer formation. And, when a constant voltage of 80V was applied, the Lissajous' figures showed the form which was for growing into porous film. As result, black porous film grew on the surface of the Al-Si alloy. Barrier layer was formed in 1.1>Ep/Eb, while porous film grew in 1.1<Ep/Eb.
  • 田中 良平
    1979 年 30 巻 11 号 p. 610-616
    発行日: 1979/11/01
    公開日: 2009/10/30
    ジャーナル フリー
feedback
Top