Pickling solution

Details Pickling solution Pickling solution

1972-11-29

1976-02-03

Scovronek, Joseph

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 41, 252 791, 252148, 252392, C23G 102, C09K 1306

Patent

active

039363163

ABSTRACT:
The invention is for a process and composition for pickling metals, especially iron based metals, prior to metal finishing. A hydrohalide acid pickling solution is used which solution is characterized by the addition of urea. The urea substantially reduces, even completely eliminates, the excessive liberation of noxious and corrosive hydrohalide acid fumes normally associated with such pickling operations. This is an advantage as it greatly reduces the cost of the pickling operation as the consumption of acid is dramatically reduced. Moreover, there is less injury to personnel and equipment contacted with said fumes. Finally, a metal surface treated with the pickling solution of the invention is improved as there is less pitting and the surface is more active to a metal depositing solution.

REFERENCES:
patent: 2177751 (1939-10-01), Sikorski
patent: 2485529 (1949-10-01), Cardwell et al.
patent: 3009849 (1961-11-01), Bellinger
patent: 3595799 (1971-07-01), Peterson
patent: 3655571 (1972-04-01), Tedeschi et al.
patent: 3663441 (1972-05-01), Gulla
patent: 3788914 (1974-01-01), Gumbelevicius
Monsanto, Application Data Bulletin No. 108 - Hibitite and Inhibited Acids, 3/30/39, pp. cover & 3-7, 11 Printed 1/36.

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