巻号一覧
36 巻, 6 号
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福島 志郎, 細川 直吉1985 年 36 巻 6 号 p. 218-228
発行日: 1985/06/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (2035K) -
永田 弘人, 小岩 一郎, 逢坂 哲彌, 吉井 敏文1985 年 36 巻 6 号 p. 230-235
発行日: 1985/06/01
公開日: 2009/10/30
ジャーナル フリーThe effects of additives and dissolved oxygen on electroless copper deposition for full additive method were studied by means of electrochemical measurement and analysis of the deposited films. The use of two kinds of additives, 2, 2′-bipyridine and potassium hexacyanoferrate (II), significantly improved the properties of deposited copper film. Dissolved oxygen also played a key role in controlling deposited copper properties. The effect of the additives could be effectively detected by the electrochemical method, in that inhibition of the partial anodic and cathodic reactions and adsorption capacitance around the mixed potential region were observed. The electrochemical method, however, was virtually ineffective in detecting the effect of dissolved oxygen. Dissolved oxygen inhibited variations in bath pH, and it might have the inhibition effect of side reactions of formaldehyde decomposition. Electrochemical analysis was useful only for interfacial behavior in the bath.抄録全体を表示PDF形式でダウンロード (1500K) -
低温浸炭に関する二, 三の考察坂井 徹郎1985 年 36 巻 6 号 p. 236-241
発行日: 1985/06/01
公開日: 2009/10/30
ジャーナル フリーThe author has been unable to find any reports on the carburizing of cemented carbide WC-Co systems at temperatures of the order of 500-600°C.
In this study, at low temperature a cemented carbide WC-Co system was carburized to examine the applicability of the paste process to cemented carbide used for wood cutting tools.
It was found that:
(1) WC-Co cemented carbide system increased in mass after carburization and the rate of mass gain depended on Co content and acceleration factors.
(2) A layer containing Co2 C was formed in a very short time on the WC-Co alloy surface.
(3) Hardness increased with both longer time and higher temperature carburization, but transverse rupture strength decreased.
(4) Low Co alloys could be hardend by carburization in the same way as iron and steel, but toughness was decreased. The use of higher Co content alloys and lower carburizing temperatures will be effective in obtaining alloys that were of tough and also applicable to cemented carbide tools.抄録全体を表示PDF形式でダウンロード (1278K) -
滝沢 貴久男, 志水 康彦, 樋口 義弘, 田村 今男1985 年 36 巻 6 号 p. 242-247
発行日: 1985/06/01
公開日: 2009/10/30
ジャーナル フリーThe effects of S and Mn content on the corrosion behavior of 18-8 stainless steels in the active region have been studied using mainly electrochemical means in sulfuric acid and L-ascorbic acid (C6 H8O6) solutions. The composition of sulfide inclusions (MnS) depended on the Mn/S ratio in the steels, and dissolution resistance of MnS inclusions was increased by decreases in the ratio. To the extent that MnS inclusions exist stably in the steel, they retard the cathodic reaction and the anodic dissolution reaction in the active region of the steel. When MnS inclusions were unstable and easily dissolved, however, the reactions are accelerated. Therefore, in a highly corrosive environment such as H2SO4 solution, in which the MnS inclusions are dissolved without difficulty, the corrosion resistance of the steel can be improved by decreasing the MnS content. On the other hand, in a corrosive environment such as C6H8O8 solution, in which MnS inclusions are dissolved with difficulty, corrosion resistance can be improved by decreasing the MnS contents or the Mn/S ratio.抄録全体を表示PDF形式でダウンロード (2336K) -
市島 真司, 中本 哲男, 神田 勝美1985 年 36 巻 6 号 p. 248-253
発行日: 1985/06/01
公開日: 2009/10/30
ジャーナル フリー1) Electroplating behaviour showed a similar relationship to bath conditions such as temperature pH and flow rate as in the case of ordinary Zn-Fe family element electroplating.
2) In Zn-Co depositions between 3 and 10g/m2, corrosion resistance improves with an increase in the content of 2.5wt% or more, but if 5.0wt% of Co is exceeded, formability goes down. Thus the optimum Co content in the pretreatment of hot dip galvanized steel sheet is 2.5-5.0wt%.
3) The severity of corrosion of PVC-coated steel sheet in salt spray tests and ordinary outdoor exposure tests can be actually be reversed, depending on the type of base metal used (including method of pretreatment).
When galvanized steel sheet is used, it is desirable to use a test that indicates whether the corrosion products have an anticorrosion effect.抄録全体を表示PDF形式でダウンロード (1820K)
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