Process for obtaining a plate of ZR alloy comprising a portion o

Details Process for obtaining a plate of ZR alloy comprising a portion o Process for obtaining a plate of ZR alloy comprising a portion o

1990-12-13

1992-01-07

Morris, Theodore

Cleaning and liquid contact with solids

Processes

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

134 254, 134 28, 134 41, 1566591, 156664, 252 793, 252 794, 427275, B05D 310, B44C 122, B08B 308

Patent

active

050787977

ABSTRACT:
A process for obtaining a plate of zirconium alloy comprising at least one portion of excess thickness of at least 0.5 mm relative to a large adjacent face, the portion having edges with angles equal to 90.degree. to 105.degree. and flanks which are connected without depressions to the large adjacent faces. According to the process, a surface portion of a blank plate located straight above a desired portion of excess thickness is coated with a continuous coating which is resistant to a pickling composition to be used, the coated portion widened beyond the desired portion of excess thickness by 0.5-1.5 times the amount of the excess thickness. The coated blank plate is immersed a plurality of times, without passage of electric current, in a pickling bath comprising HF, an oxidizing agent and water, and having a dissolved Zr content less than 12 g/l and a temperature below 35.degree. C. Each immersion removes less than 0.3 mm of thickness over the portions of the blank plate which are not coated. Subsequently, the coating is removed and the blank plate is immersed in the pickling bath for a final treatment. This process can be employed for the preparation of plates of great length which are to be folded, each portion of excess thickness being placed inside a folded angle, in particular to form boxes for ducts for the circulation of fluids.

REFERENCES:
patent: 2517430 (1950-08-01), Hensel et al.

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