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Volume 30, Issue 3
Displaying 1-5 of 5 articles from this issue
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Hideo TOGANO1979 Volume 30 Issue 3 Pages 116-125
Published: March 01, 1979
Released on J-STAGE: October 30, 2009
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Koji AOKI, Osamu TAKANO, Satoru ISHIBASHI1979 Volume 30 Issue 3 Pages 126-131
Published: March 01, 1979
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSElectroless nickel-copper-phosphorus alloy platings from ammonia alkaline citrate bath (A-C bath) and caustic alkaline citrate bath (C-C bath) containing sodium hypophosphite as a reducing agent were investigated to determine the effect of copper ion concentration on the deposition rate, corrosion resistance and structure of the deposits. The basic bath composition was found to be: nickel sulfate +copper sulfate 0.1M, sodium hypophosphite 0.2M, sodium citrate 0.2M, pH10 (adjusted with NH4OH or NaOH); bath temperature was 80±2°C. The copper content in the nickel-copper deposits were found to be 0% to 44.5% in A-C bath and 0% to 69.0% in C-C bath, respectively, depending on the copper ion ratio in the plating bath. In A-C bath, the deposition rate increased considerably with the copper ion concentration in the bath, but in C-C bath, this effect was very small. The corrosion resistance of the deposits, containing 16.5% copper and 4.7% phosphorus, from A-C bath, and of the deposits containing 8.0% phosphorus, from C-C bath was excellent for a 0.5M sulfuric acid solution at 30°C.View full abstractDownload PDF (1034K) -
Yasuhiro HARA, Yoshiharu KAGAWA, Kohei IKEGAMI1979 Volume 30 Issue 3 Pages 132-136
Published: March 01, 1979
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSThe effect of the addition of Mo and Al to Cr in diffusion-coating has been investigated by carrying out stress corrosion cracking tests and electrochemical examinations. Austenitic stainless steels, SUS304, and SUS304L were diffusion-coated with Cr-Mo, and SUS304 with Cr-Al in H2 atomosphere. The addition of Mo improved the resistance to stress corrosion cracking, because it increased the stability of passivity and inhibited the break of passivity. On the other hand, the addition of Al made the passivity unstable and a bad effect on the resistance to stress corrosion cracking was recognized because of the diffusion of Al into the base metal, SUS304.View full abstractDownload PDF (1369K) -
Nobuyuki KOURA, Takeshi KANNO, Noboru YONEDA1979 Volume 30 Issue 3 Pages 137-142
Published: March 01, 1979
Released on J-STAGE: October 30, 2009
JOURNAL FREE ACCESSThe objective of this investigation is to develop a method for TiC coating on steel which can be easily performed at a lower temperature than that commonly used. An electroless TiC coating from a molten salts bath was studied. For an optimum condition to perform the TiC coating, a bath containing 95mol% 2KCl⋅BaCl2-5mol% K2TiF6-Ti sponge was employed, developing time of which was 3h. The coating on 1% C-steel specimens was carried out for 1h at 950°C under an Ar atmosphere. In this condition, the TiC coatings possessed a metallic brightness and high hardness more than 4, 000kg/mm2. The TiC coating appears to be performed when the carbon content of steel exceeds around 0.8%. It is concluded that Ti deposited on steel specimens by a disproportionation reaction combines with carbon to form TiC, and that the carbon involved seems to be transferred from the inner part of the steel to the surface.View full abstractDownload PDF (1227K) -
Electric Conduction in Organic CrystalsMasahiro KOTANI1979 Volume 30 Issue 3 Pages 143-158
Published: March 01, 1979
Released on J-STAGE: October 30, 2009
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