Showing papers on "Sodium hypophosphite published in 1968"
TL;DR: In this article, a pulse polarographic method is described for determining traces of indium in cobalt and its compounds, at pH 4.5-5.5 and 3·10−8 M in 4 M hydrochloric acid−10% sodium hypophosphite.
5 citations
Patent•
26 Jun 1968
TL;DR: In this article, a microporous chromium is applied to an article by applying to the article a metallic layer containing electrically non-conductive organic fibres and thereafter electrolytically applying to this layer a Cr layer, the fibres being applied in the metallic layer in such a quantity that the superposed Cr layer is micropous.
Abstract: 1,118,167. Depositing microporous chromium. RESEARCH HOLLAND N. V. Dec. 3, 1965 [Oct. 23, 1964], No. 43290/64. Headings C7B and C7F. Microporous Cr is deposited on an article by applying to the article a metallic layer containing electrically non-conductive organic fibres and thereafter electrolytically applying to this layer a Cr layer, the fibres being applied in the metallic layer in such a quantity that the superposed Cr layer is micropous. The term 'fibre' means an elongated body of a length which exceeds its thickness or diameter and a microporous coating or layer means a coating or layer having at least 1000 pores per sq. cm. A bright metallic layer, e. g. electrolytically deposited Ni may be applied to the article prior to applying the fibrous layer. The fibrous layer may be electrolytically deposited Ni, electrolytically deposited Co (Example VIII), or Ni deposited non-electrolytically from a sodium hypophosphite bath (Example IX). The fibres may be 1) natural fibres, e.g. cotton, wool, silk, kapok, flax, down or fur, 2) semi-synthetic plastics fibres, e.g. cellulose acetate or rubber or 3) synthetic plastics fibres, e.g. polyamides, polyesters, polyvinyl compounds, latex, fluorocarbon polymers or silicones. The fibres may be kept in suspension by a stirrer or by air circulation or injection. The articles may be Fe, Cu, brass, Zn, Al or synthetic resin materials. Details of bright, semi-bright and matt Ni electroplating baths containing cellulose fibres are given in Examples I to IV, the brightening agents in Examples I and IV being butine diol and in Example II 2-butene-1, 4-diol Example VIII discloses an electroplating bath containing cobalt chloride, sodium tungstate and nylon fibres. Example IX discloses a non- electrolytic bath containing nickel chloride, sodium citrate, NH 4 Cl, NaH 2 PO 2 and PVC fibres at pH 9 and a temperature of 90‹ C.
2 citations
TL;DR: Ni4.5P as mentioned in this paper,Ni3P,Ni1.8P,0.5N,Ni2.2P, Ni3P 0.2N 0.
Abstract: 水溶液中でニッケル塩を次亜リン酸塩により還元して得られる黒色微粉末状触媒の製法と化合形態について研究した。製造はたとえばつぎのようにした。すなわち,次亜リン酸ナトリウム8g,水酸化ニッケル7gを含むpH12の分散液300mlをつくり,これを3lのビーカーに入れ,かきまぜながら温浴中で90～95℃に加熱し,触媒物質を沈殿として析出させた。触媒の化合形態の研究手段には化学分析,希塩酸への溶解性状,X線回折および熱分析などを用いた。その結果触媒の主要成分は無定形のニッケル(Ni)とニッケルリン化物(NixP)であることがわかった。この両者は希塩酸に水素を発生してとけるがNixPはNiより遙かに難溶性であった。この難溶性物質の見掛け組成は塩酸濃度により異なり,2N塩酸の場合はNi1.8P,0.5N塩酸の場合はNi2.2Pであった。触媒の主要成分(NiとNixP)の平均組成はNi4.5Pで,これを約350℃に加熱すると結晶性の金属NiとNi3Pの混合物に変化した。NiとNixPの共存状態はxの値が処理する塩酸の濃度により異なることなどから固溶状態にあると考えられた。その他不純物として水酸化ニッケルや亜リン酸ニッケルが存在することがわかった。
1 citations