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今井 八郎1988 年 39 巻 12 号 p. 764-771
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーStructural materials having metal-metal or metal-nonmetal crevice parts were corroded locally within crevices in solutions containing chloride ions. Recent work and developments concerning methods for evaluating crevice corrosion of stainless steels and for providing protection against it are described.抄録全体を表示PDF形式でダウンロード (2118K) -
趙 霊源, 姚 素薇, 小若 正倫1988 年 39 巻 12 号 p. 772-777
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーAn investigation of electrodeposited chromium-molybdenum alloy films was undertaken to determine the effect of crystal structure on corrosion behavior. X-ray (Cu-Kα) analysis was employed to investigate the crystal structure. Anodic polarization curves and immersion tests in 5% sulfuric acid solution at 30 and 60°C were performed, and pitting potentials in 3% sodium chloride solution at 30°C were observed.
It was found that films with excellent corrosion resistant were formed by electrolysis at bath temperatures at 30 and 70°C and cathode current densities of 20-100A/dm2 in solutions containing molybdate. Films deposited at a bath temperature at 50°C and sutable cathode current density were bright, but had poor corrosion resistance and dissolved out in a few minutes in 5% sulfuric acid solution at 60°C. It was shown that in this type of crystal structure the well-oriented Cr {222} face was parallel to the substrate. However, corrosion of this type of film can be improved by passivation treatment in water containing oxygen or in nitric acid solution.抄録全体を表示PDF形式でダウンロード (1906K) -
逢坂 哲彌, 新井 克矢, 増渕 長則1988 年 39 巻 12 号 p. 778-784
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーElectroless Ni-Mo-B alloy films plated from developed simple baths were investigated. The use of dimethylamine-borane as a reducing agent resulted in a higher Mo content (17.3 at %) than with the hypophosphite reducing agent bath. The initial addition of Na2MoO4 to the bath resulted in an abrupt decrease in B content and increase in Mo content in the plated film. The codeposited Mo atoms made the film amorphous even at low B contents. Crystallized Ni-Mo-B alloy films showed different structures despite the fact that they had almost the same film compositions. They were confirmed to be composed of two regions of high and low crystallization. This peculiar condition was found to be due to Mo atom segregation, which resulted in higher resistivity. The grain size of the crystallized Ni-Mo-B alloy films did not change even after heat treatment at 500°C for 1h.抄録全体を表示PDF形式でダウンロード (2088K) -
安川 三郎, 安田 守宏, 石井 将和, 加藤 皓一, 兵藤 雅己1988 年 39 巻 12 号 p. 785-789
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーThe inhibiting action of various organic reagents on the reaction between 1, 1, 1-trichloroethane (CCl3CH3) and aluminum was investigated by the degree to which the induction period of the reaction was prolonged. The relationship between the chemical constitution of the reagents and the inhibiting action was also discussed.
The results are summarized as follows: 1) From the standpoint of the functional radicals of the reagents the inhibiting action was stronger in the order of ether<ester<alcohol<amine<keton<nitrile<amide. 2) An increase in the carbon count in the alkyl radical of aliphatic compounds did not contribute to greater inhibiting action. 3) The inhibiting action of ether and alcohol isomers was stronger in the order of n-<iso-<sec-<tert- but that of amine isomers was stronger in the reverse order. 4) In a single functional radical an increase in the inhibiting action was not observed even if the aliphatic compound was converted into the benzene compound. 5) The inhibiting action of compounds having two functional radicals (dihydric alcohol diamine diketon dinitrile and dinitro compounds) was stronger than for those having a single functional radical but some dihydric and trihydric phenols and diamides, which are insoluble in CCl3CH3 had no effect on the inhibiting action.抄録全体を表示PDF形式でダウンロード (755K) -
右田 泰治, 斉藤 明夫1988 年 39 巻 12 号 p. 790-795
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーThe effect of polyethylene glycol mono-p-nonylphenyl ether on heavy electrodeposition of silver from cyanide baths were studied. It was found that by adding polyethylene glycol mono-p-nonylphenyl ether to cyanide baths, the rate of growth in the direction of the normal line at the (111) and (222) planes became larger than the rate of growth in other planes, and catholic polarization became smaller.
These results suggest that polyethylene glycol mono-p-nonylphenyl ether absorbed onto the (111) and (222) planes facilitates crystal growth in the direction of the normal line at the (111) and (222) planes.
Using a bath composed of 125g/L of AgCN, 185g/L of KCN, 20g/L of KOH, 20g/L of K2CO3, and 10-30mg/L of polyethylene glicol mono-p-nonylphenyl ether.
It was possible to obtain silver deposits of a thickness of 7000μm or more at a current density of 10A/dm2.抄録全体を表示PDF形式でダウンロード (1409K) -
松木 健三, 立花 和宏, 菅原 陸郎, 船越 明, 菅沼 栄一1988 年 39 巻 12 号 p. 796-802
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーThe AC etching of aluminum foil (99.99%) in 5% hydrochloric acid solution was studied by cyclic chronopotentiometry, SEM observation and electrostatic capacity measurement. Prolonged cyclic chronopotentiograms at a frequency of 50Hz were measured under different current densities and temperatures, and expressed in three-dimensional graphics as a function of cycle number. Potentialcycle number curves were also derived from the chronopotentiograms at arbitrary times.
Change in the peak potential at anodic half cycles was closely related to the potential in the subsequent cathodic half cycles. The time, tp, at which the anodic peak is attained and the value of the anodic peak potential, Ep, varied with cycle number. The potential -cycle number curve was greatly affected by the current density at the cathodic half cycles and changes in tp and Ep became greater as the electrolyte temperature was increased. When the etching was carried out with a high anodic peak potential and without large fluctuation in the potential-cycle number curve, the pits were densely formed on the aluminum foil, providing high electrostatic capacity.抄録全体を表示PDF形式でダウンロード (1403K) -
世利 修美, 田頭 孝介1988 年 39 巻 12 号 p. 803-808
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーElectrochemical investigation of NaOH cleaning was carried out as a pretreatment for etching of electrolytic capacitors. An attemp was made using electrochemical equipment to clarify the relation between NaOH cleaning and cathodic pretreatment. It was found that surface treatment of aluminum by NaOH cleaning is electrochemically equvalent to cathodic treatment in a deaerated NaCl solution.抄録全体を表示PDF形式でダウンロード (1643K) -
小見 崇, 中村 雅彦, 山本 久1988 年 39 巻 12 号 p. 809-812
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーA study was conducted to determine the maximum obtainable tungsten content in the alloy, using ammoniacal alkaline citrate baths of pH7.5-9.0 at 80°C. Sodium citrate and citric acid were considered as the complexing agent. The presence of a large amount of sodium in the bath reduced tungsten content and current efficiency. When a suitable amount of sodium tungstate and nickel sulfate were added to the citric acid baths, alloys up to 51wt%W, corresponding to Ni3W, were obtained. Since alloys exceeding 40wt% W were obtained for the first time, X-ray examination and hardness testing were also conducted. Alloys exceeding 44wt% W (Ni4W stoichiometry) were amorphous, having extremely small atomic size. The Vickers hardness of the 44wt% W alloy was Hv 1350 after heating at 550°C for 1h.抄録全体を表示PDF形式でダウンロード (554K) -
岩崎 源, 正楽井 暎治1988 年 39 巻 12 号 p. 813-817
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーThe friction characteristics of Ni-graphite composites electrodeposited on the surfaces of tools used for plastic forming of metals were studied by measuring coefficients of friction and by examining the characteristics of tool surfaces after ring compression of aluminum alloy. The coefficient of friction reached a minimum of 0.12 with a composite deposited by using a electrolyte including 20g/L of graphite and no surface active agent, at a current density of 3A/dm2, a pH of 6 and a temperature of 80°C. When a non-ionic surface active agent was used, the graphite content in the composite increased but the coefficient of friction also increased as much as that of Ni plate. The graphite particles deposited with Ni particles still remained in the composite after five tests and the composites seem to be capable of acting as good lubricants in plastic metal forming.抄録全体を表示PDF形式でダウンロード (2718K) -
全面にめっき皮膜をもつ円形断面の試験片を用いた場合千葉 和茂, 加藤 博, 嵯峨 卓郎1988 年 39 巻 12 号 p. 818-823
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーExperiments were carried out in accordance with a design of experiment and the following results were obtained.
(1) For high strength low alloy structural steel with a grade of 80kgf/mm2, difference in galvanizing conditions had no effect on elongation or reduction of area.
The cooling method affected yield point, and the yield point of specimens that were air-cooled after galvanizing was lower than that of water-cooled specimens.
Dipping times affected tensile strength, and the value decreased with an increase in dipping time.
The effect on HT 80 B-steel was minor for all properties investigated, but an effect was on HT 80 A-steel with a thin galvanized layer.
(2) For high strength bolt steel with a grade between 80 and 120kgf/mm2, the hardness of the LCB-steel was reduced by dipping at a bath temperature higher than the tempering temperature. All tensile properties were decreased by galvanizing.
Yield point and tensile strength of the SNCM-steel were not affected by galvanizing. Elongation and reduction of area of steel galvanized after blasting were decreased by the high-notch sensitivity of the steel.抄録全体を表示PDF形式でダウンロード (1981K) -
柴田 俊夫, 頓部 洋也1988 年 39 巻 12 号 p. 824-828
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーThe electrochemical conditions conductive to improving pitting susceptibility of Type 304 stainless steel using potentiostatic etching and passivation pretreatment in 1N H2SO4 solution at various temperatures have been investigated. Pitting susceptibility after pretreatment was evaluated by measuring pitting potential in 3.5mass% or 7.0mass% NaCl solutions. A combination of etching treatment at 333K, -0.07V (vs. SHE) and passivation treatment at 344K, 0.75V was found to give the most noble pitting potential. This optimum condition maximized to cause the Cr/Fe ratio in the passive film, and this was confirmed by the IMA analysis. The condition for Cr enrichment in the film was discussed in terms of a comparison of the polarization behavior of Type 304 stainless steel with that of the alloying elements of Fe, Cr and Ni.抄録全体を表示PDF形式でダウンロード (776K) -
神戸 士郎, 戸井詰 哲郎1988 年 39 巻 12 号 p. 829-831
発行日: 1988/12/01
公開日: 2009/10/30
ジャーナル フリーTwo determining factors for stain formation were elucidated: the standard redox potential of the metal; and the oxide layer. It was also found that by changing the thickness of the oxide layer stain formation on iron-42% nickel alloy can be controlled.抄録全体を表示PDF形式でダウンロード (317K)
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