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Showing papers on "Sodium dichromate published in 1981"


Journal ArticleDOI
01 Jan 1981-Fuel
TL;DR: In this paper, the aqueous Na 2 Cr 2 O 7 (Na 2 Cr O 7 ) oxidation was applied to coals, coal products, model compounds and polymers.

26 citations


Journal ArticleDOI
TL;DR: In this paper, a study of the thermal decomposition of intimate mixtures of sodium chlorate and chromium(III) oxide in different molar ratios was made employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray diffraction analysis.
Abstract: A study of the thermal decomposition of intimate mixtures of sodium chlorate and chromium(III) oxide in different molar ratios was made employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray diffraction analysis. Sodium chlorate in the presence of chromium(III) oxide starts to decompose around 180°, which is much below the decomposition temperature of pure NaClO3. Each mole of Cr2O3 consumes 8/3 moles of NaClO3, undergoing oxidation to sodium dichromate.

7 citations


Journal ArticleDOI
TL;DR: In this article, it was demonstrated that acid etch increased the bond strength and environmental durability of 301 stainless steel bond joints with an etch time of five minutes, acid concentration of twenty percent, and a temperature of 61°C.

5 citations



Patent
21 Jul 1981
TL;DR: Chromium trioxide is made by reacting sodium dichromate with sulphuric acid in an aqueous reaction mixture, and the resultant liquor, after separation of the crystals, may be recycled to the reaction mixture consisting of dichromates and sulfuric acid as mentioned in this paper.
Abstract: Chromium trioxide is made by reacting sodium dichromate with sulphuric acid in an aqueous reaction mixture, evaporating the resultant liquor to cause crystallization of most of the chromium trioxide and to cause the concentration of sodium sulphates to be close to but below that at which sulphate crystals start to form, and separating the chromium trioxide crystals from the evaporated liquor. The liquor may then be cooled so as to cause crystallization of sodium sulphates, generally as sodium bisulphate, and the resultant liquor, after separation of the crystals, may be recycled to the reaction mixture containing dichromate and sulphuric acid.

4 citations


Patent
02 Mar 1981
TL;DR: The control of fungus is a serious problem in the hatching of fish Sodium dichromate, potassium dichrome, and chromium trioxide are effective fungicides for the inhibition of fungal growth on fish eggs and young fry during hatching as discussed by the authors.
Abstract: The control of fungus is a serious problem in the hatching of fish Sodium dichromate, potassium dichromate and chromium trioxide are effective fungicides for the inhibition of fungal growth on fish eggs and young fry during hatching

1 citations


Patent
27 May 1981
TL;DR: A solarlight absorbing member formed with a black coating over the surface of a base material made of carbon steel or low alloy steel and then immersing the same in a molten salt consisting of sodium dichrome and potassium dichromate is presented in this article.
Abstract: PURPOSE:To enhance heat resistance and corrosion resistance, by spraying austenite stainless steel over the surface of a base material made of carbon steel or the like, and then immersing the same in a particular molten salt, thus forming a black coating over the surface of said base material. CONSTITUTION:A solarlight absorbing member formed with a black coating over the surface thereof is obtained by spraying austenite stainless steel over the surface of a base material made of carbon steel or low alloy steel and then immersing the same in a molten salt consisting of sodium dichromate and potassium dichromate. Here, the thickness of the spray-coated layer of austenite stainless steel can be about 200- 300mu. However, if a high weather resistance is required, the thickness is increased to about 500mu. Further, the mixing ratio of potassium dichromate and sodium dichromate of the molten salt by weight is preferably 1:1. The temperature suited for the above process is about 420 deg.C and the time suited for the immersion is preferably 45min.

1 citations