Chemistry: electrical and wave energy – Processes and products
Patent
1978-06-30
1980-06-24
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 37R, 204 56R, 148 18, 148 28, 148 614R, C25D 910, C25D 550
Patent
active
042093660
ABSTRACT:
Before or during the coiling of cold-rolled sheet steel for stamping, the sheet steel is covered with a substance comprising an agent capable of reacting with amorphous carbon present on the sheet as a contaminant so as to form a volatile compound, such as carbon monoxide or carbon disulphide, during subsequent annealing of the coil. Suitable substances for forming carbon monoxide are (1) certain gels (e.g., gels deposited in the form of a very thin layer from a solution of a soluble silicate such as sodium, potassium, or lithium orthosilicate) which liberate water of adsorption on heating, as during annealing, which water of adsorption reacts with the carbon contaminant to form carbon monoxide; and (2) certain salts [e.g., Ba(OH).sub.2. 8H.sub.2 O, Ca(OH).sub.2, and Zr(OH).sub.4 ] which liberate water of crystallization or water of constitution on heating, as during annealing, which waters of crystallization and constitution react with the carbon contaminant to form carbon monoxide. Suitable substances for forming carbon disulphide are thiourea, diethyl thiourea, and sulphonates.
REFERENCES:
patent: 1535317 (1925-04-01), Koehnline
patent: 3632487 (1972-01-01), Brown et al.
patent: 3671335 (1972-06-01), Pavlik
patent: 3718510 (1973-02-01), Patula et al.
Leroy Vincent M.
Richelmi Joseph H.
Andrews R. L.
Centre de Recherches Metallurgiques Centrum Voor Research in de
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