巻号一覧
32 巻, 1 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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逢坂 哲弥, 音居 文雄, 沢井 秀夫1981 年 32 巻 1 号 p. 13-16
発行日: 1981/01/01
公開日: 2009/10/30
ジャーナル フリーThe behavior of nickel deposition from electroless Ni-W-P plating bath was studied from the adsorption spectra of nickel complexes contained in the bath, the amount of phosphorous acid produced in the plating bath, and the effect of WO42- concentration on anodic and cathodic polarization curves of Pd electrode. Nickel-ammonia-citrate complexes seemed to be formed in the plating bath solution. The relative amount of sodium hypophosphite used in the plating of nickel increased from 16 to 25% in the addition of Na2WO4. The partial anodic polarization curves for the oxidation of hypophosphite ion and the cathodic polarization curves for the nickel deposition showed that these reactions were accelerated with the addition of Na2WO4. These results were in good agreement with those obtained in electroless Ni-W-P plating tests.抄録全体を表示PDF形式でダウンロード (553K) -
根津 弘幸, 藤井 茂忠, 金子 紀男, 大渕 美千栄1981 年 32 巻 1 号 p. 17-22
発行日: 1981/01/01
公開日: 2009/10/30
ジャーナル フリーThe reaction product of epichlorohydrin and imidazole as an addition agent has been investigated by means of IR spectrometry and electrochemical methods. The product was a polymer which was found to have C-O-C bondings in the main chain with attached hydroxyl groups and quaternized imidazole rings. In an alkaline solution, the product was not subject to both oxidation and reduction but was adsorbed on the dropping mercury electrode in the range of potentials from -0.2 to -2.0V (vs. SCE), and inhibited the reduction of zincate ions. On the zinc electrode, however, the product adsorbed at the electrode surface increased the overvoltage of zinc deposition and decreased the overvoltage of hydrogen. The zinc deposit from the zincate bath containing the reaction product exhibited a preferred orientation with the (1120) plane parallel to the surface, and its cross section showed a banded structure.抄録全体を表示PDF形式でダウンロード (1439K) -
榎本 英彦, 藤原 裕, 石川 正巳1981 年 32 巻 1 号 p. 23-28
発行日: 1981/01/01
公開日: 2009/10/30
ジャーナル フリーThe effects of amino acids on the electrodeposition of tin-nickel alloy from pyrophosphate baths were studied. Mirror bright deposits of the alloy were obtained from pyrophosphate baths containing an α-amino acid such as glycine, valine, serine or threonine. Using proline or histidine, bright deposit was also obtained, but the bath was unstable and the surface of deposits readily became rough. β-Alanine did not afford good result due to its weaker complexing ability than α-amino acids. Continuous variation method in the measurement of absorption spectra revealed the formation of 1:1-complex between nickel and pyrophosphate. Addition of an α-amino acid to the nickel-pyrophosphate solution lead to the formation of a mixed complex of nickel with pyrophosphate and α-amino acid. Codeposition of tin and nickel was attributed to the mixed complex formation and its higher susceptibility to reduction.抄録全体を表示PDF形式でダウンロード (833K) -
鋼中合金元素 (Ni, Cr, V, Mn, Si) ならびに浴中NaCN添加の影響小浦 延幸, 中台 文夫1981 年 32 巻 1 号 p. 29-34
発行日: 1981/01/01
公開日: 2009/10/30
ジャーナル フリーA TiC coating method on steels containing various alloying elements and the coating mechanism have been investigated. Steels containing large amount of alloying elements were carburized by a drip feed method. All of the carburized steels were able to be coated with TiC from a bath with 5mol NaCN. A carbon potential of the bath added NaCN was known to be 0.1% by a carburizing test. The effects of alloying elements, Ni, Cr, Mn, and Si, in steels on the coating were also studied. Except a case of 3.0% Si, a good coating was obtained. Electron prove microanalyses (EPMA) revealed that Ni, Cr, and Mn did not diffuse into the coating while a large amount of V was accumulated in it. The mech anism of TiC coating was also investigated. When KF was used instead of K2TiF6 for the sourse of F, the TiC coating was obtained. From the study on the effects of the KF addition by using EPMA, it was found that the Ti deposition occured according to a disproportionation reaction. An activation energy for the TiC coating was similar to that of the diffusion of carbon in a 0.9% C steel. This fact may suggest that a rate determining step for the coating is a diffusion of carbon.抄録全体を表示PDF形式でダウンロード (1841K) -
水木 一成, 馬場 宣良1981 年 32 巻 1 号 p. 35-39
発行日: 1981/01/01
公開日: 2009/10/30
ジャーナル フリーIt is well known that the normal oxalic acid anodized (Vf 50-60V) films cannot be electrolytically colored in NiSO4 solution. In fact, no coloring occured in any voltages, and the local breakdown of the films, so-called “spalling”, was induced at about 35V AC. In other words, Ni cannot be electrodeposited in the micropores of the oxide films. However, it has been experimentally found that the oxalic acid film formed at low anodizing voltage (7-8V DC) was uniformly and deeply colored in bronze shade. Furthermore with thin oxide films less than 1μm, full coloring such as blue, green, yellow and red-purple shades were obtained, and above 3μm thick films were colored in bronze shade. When the full-colored films were illuminated with white light, the incident light was reflected on the top of the electrodeposited Ni needles and at the bottom of the micropores (metal interface), and the both reflected rays interfered. The interferent beam can be seen as various colors with growing of Ni needles. In this case, not only the thickness of the barrier and porous oxide layers but also an uniformity of the height of Ni needles in the micropores is particularly important. And the height of Ni needles is considered to be the order of ca. 1/4 wavelength of a visible light from the optical theory,抄録全体を表示PDF形式でダウンロード (1375K) -
佐藤 忍, 糸井 康彦, 荷見 昭夫, 佐藤 栄一1981 年 32 巻 1 号 p. 40-45
発行日: 1981/01/01
公開日: 2009/10/30
ジャーナル フリーOxide films were anodically formed on aluminum in a sulfuric acid solution and examined using techniques such as (a) Hunter's method of measuring i-V curve, (b) Immersion test for pitting corrosion, and (c) Scanning and transmission electron microscopy. The purpose of this investigation was to examine the effect of impurities and alloy components in the metal on the structure and corrosion resistance of the oxide films. The Hunter's method was somewhat revised so as to measure extremely small current densities in the 10-9A/cm2 range. It was demonstrated from the i-V curve measurements that the amount of defects in the oxide changes with samples of different purities, increasing from left to right as A (99.99%) <B(99.91%)<C(99.46%)<D(99.61%)<E(99.15%) and, in accordance with this order, the corrosion resistance measured by the immersion test decreases. Observations by SEM and TEM showed that the number of cell increases and the cell size becomes uneven as the sample changes from the left and right. Inclusions causing the defects were observed as shinny white and black spots. Thus, pitting corrosion of aluminum is cleary related to the amount of defects in the barrier layer of the oxide. The defect concentration can be estimated using a revised Hunter's method of measuring the current at high sensitivities.抄録全体を表示PDF形式でダウンロード (2323K)
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