A RAPID VOLUMETRIC METHOD FOR Si IN Al ALLOY

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Nippon Kinzoku Gakkaishi (Japan)

OSTI ID:4101400

Hasegawa, M

A method for the determination of silicon in aluminum alloys was developed which consists of the formation of K/sub 2/SiF/sup 6/ and its titration with NaOH. About 0.2 to 0.5 g of sample were placed in a 300 ml polyethylene conical beaker; 60 ml of hot (1: 1) HNO/sub 3/ and 5 ml of HF were added. The sample was dissolved without heating, diluted with water to lOO ml. cooled rapidly to 20 deg C, and KNO/sub 3/ was added until the solution was saturated. The solution was flltered through No. 5A filter paper and the precipitate washed with cold washing solution (l50 g KNO/sub 3/ in 850 ml distilled water and 150 ml alcohol) until the washings were acid-free. The paper and precipitate were transferred to a 500-ml beaker and 200 ml of carbon dioxide-free boiling water was added. The solution was titrated, while still hot, with NaOH solution, using 5 drops of phenolphthalein indicator. One ml of 0.5 N NaOH = 0.3508% Si. With aluminum alloys, this method is only interfered with by titanium, tantalum, and zirconium. The entire procedure can be carried out within 50 min. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-005967
• OSTI ID: 4101400
• Journal Information: Nippon Kinzoku Gakkaishi (Japan), Journal Name: Nippon Kinzoku Gakkaishi (Japan) Vol. Vol: 24; ISSN NIKGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ALCOHOLS
ALUMINUM ALLOYS
CHEMISTRY
COOLING
DYES
FILTERS
HEATING
HYDROFLUORIC ACID
INTERFERENCE
NITRIC ACID
PAPER
PHENOLPHTHALEIN
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
SILICON
SILICON FLUORIDES
SODIUM HYDROXIDES
SOLUTIONS
TANTALUM
TEMPERATURE
TITANIUM
TITRATION
WATER
ZIRCONIUM