金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
39 巻, 6 号
選択された号の論文の7件中1~7を表示しています
  • 高谷 松文
    1988 年 39 巻 6 号 p. 292-300
    発行日: 1988/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Composite coatings made of a metal matrix and particles dispersed in it were produced by electrodeposition.
    The normal method used for the codeposition of fine insoluble nonmetallic or metallic particles with a metal is to keep the particles constantly in suspension in the electrolyte solution while the metal is being deposited under optimum conditions.
    The included insoluble particles offer interesting physical and mechanical properties to the metal basis.
    A considerable body of literature exists on the electrodeposition of particles including carbides, oxides, sulphides, graphite etc. with various metal matrices, and having such advantageous properties as wear resistance, lubrication, high temperature strength and creep resistance.
    The preparation of composite coatings and their tribological properties are discussed.
  • 水本 省三, 縄舟 秀美, 川崎 元雄
    1988 年 39 巻 6 号 p. 301-304
    発行日: 1988/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    An investigation was conducted on the effects of heat treatment on the mechanical properties and structure of copper films deposited from two types of electroless plating baths, one containing glycine and K4Fe (CN)6, and one containing ethylendiamine and 2, 2′-bipyridyl. Heat treatment was found to relieve lattice strains, causing an increase in elongation and a decrease in the half value width of X-ray diffraction patterns. Elongation following heat treatment for lh at 160°C was more than twice that for as-plated deposits. Good correlations were found between the increase in elongation and the decrease in half value width. The ultimate tensile strength for the deposits from baths containing ethylendiamine and 2, 2′-bipyridyl increased with heat treatment.
  • 伊崎 昌伸, 小見 崇, 山本 久, 榎本 英彦
    1988 年 39 巻 6 号 p. 305-309
    発行日: 1988/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Effects of 1μm-Al2O3 content, the structure of the Watt's Ni matrix, and annealing on the tensile properties of 0-13.4vol.% Al2O3 composite were studied by scanning electron and optical microscopes. Under the optical microscope, the Al2O3 particles were observed to be dispersed uniformly in the as-deposited matrix, which had a columnar structure for 0-6.6vol.% Al2O3 composite, and a microgranular structure for 6.6-13.4vol.% Al2O3 composite. The tensile strength of the composite increased with increasing the amount of Al2O3 in the composite. Taking the grain refinement of the matrix into account, this effect could be explained by the Orowan mechanism. Tensile fracture of the composite initiated at microvoids that had been formed at the interface of the matrix and the particle. On annealing at 1000°C, however, recrystallization of the Ni matrix and coagulation of the Al2O3 particles were found within 2 hours, and after an induction periode of 10 hours, a firm bonding was found to have formed between the matrix and the particles, and the tensile strength of the composite increased with annealing time.
  • 大澤 茂樹, 武田 誠, 山村 タイ
    1988 年 39 巻 6 号 p. 310-314
    発行日: 1988/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Knowledge of the structure of the organic films of corrosion inhibition molecules or chemical compounds adsorbed on metal is essential to a better understanding of the mechanism. Most organic corrosion inhibiters absorb chemically on metal surfaces by chemical bonds between their polar group and the metal or by forming precipitate films, thus covering the surface of the metal and separating it from the corrosive environment.
    Films were formed on Zn-22% Al alloy surfaces in 3% NaCl solution (25°C, pH=4, 7, 9, ) by addition of 2, 3-Dihydroxypyridine (DHP) and 2, 3-Dihydroxyquinoxyaline (DHQ). These films were analyzed by 1HNMR, IR, IR-ATR and ESCA spectroscopy. The results of these analyses show that DHP and DHQ molecules form an octahedral structure with Al ion and a tetrahedral structure with Zn ion. These chelate complexes precipitate on Zn-22% Al alloy surface and from a film.
    The inhibitive effects of these films were studied in 3% NaCl solution (25°C, pH=4, 7, 9) by electrochemical polarization measurements. DHP and DHQ shifted the corrosion potentials toward the noble direction and strongly inhibited cathodic corrosion reaction. Therefore the generation of H2 is greatly reduced. The inhibition efficiency of DHQ against corrosion of Zn-22%Al alloy is better than that of DHP.
  • 1988 年 39 巻 6 号 p. 314
    発行日: 1988年
    公開日: 2009/10/30
    ジャーナル フリー
  • 上島 聡史, 伊藤 滋, 百谷 浩, 米田 登
    1988 年 39 巻 6 号 p. 315-322
    発行日: 1988/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Tungsten coatings 10-2μm thick were chemically deposited by CVD for 60minutes on iron, nickel, copper and stainless steel substrates according to the reaction
    WCl6(g)+3H2(g)→W(s)+6HCl(g)……(1)
    Coatings on iron substrates revealed good adhesion, when deposited at 750 and 800°C, and a diffusion layer several micrometers thick was observed between the tungsten and the iron substrate.
    Coatings on nickel, copper and stainless steel substrates revealed good adhesion even at deposition temperatures of 650 and 700°C, and diffusion layers formed between the tungsten and the substrates. No pores were observed at the interface between the tungsten and the nickel substrate. On copper substrates, tungsten deposition had to be done at below 750°C, because copper diffuses easily into the tungsten layer. The tungsten layer on stainless steel was relatively thin. Through the use of a nickel plated iron substrate, a tungsten coating was successfully deposited on an iron substrate at 650°C.
    The tungsten coatings on iron substrate obtained at 650°Chad a tendency of (211) orientation. However, on nickel and copper substrates, the tendency of (200) orientation appeared at 800°C.
  • 三田 郁夫, 宮坂 一
    1988 年 39 巻 6 号 p. 323-329
    発行日: 1988/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    ADC 12 aluminum alloy die castings were anodized in sulfuric acid or trisodium phosphate solution by applying a constant pulse voltage or direct current.
    The current waveforms obtained by pulse anodizing changed with increases in sulfuric acid concentration and anodizing temperature from that typical of the borderline behavior between barrier film formation and porous film formation (HB type) to that typical of porous film formation (P type).
    The current waveforms in trisodium phosphate solution on the other hand changed with increases in applied voltage and anodizing temperature from the HB type to that typical of anodic dissolution (D type).
    The current waveforms in trisodium phosphate solution added with sodium tartrate and potassium fluoride was the P type in which there is a greater flow of ionic current than with trisodium phosphate solution alone. Oxide films formed by do anodization in this mixed electrolyte had better glossiness and good absorption of organic dyestuff even though powdering on the films could not be eliminated completely.
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