METHOD OF JET ETCHING OF PIPES INNER SURFACE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2009 - IPC C23F1/00 C23F1/08 C23G3/04 B08B9/27 

FIELD: metallurgy industry.

SUBSTANCE: invention refers to chemical treatment of metals and may be used for jet etching of pipes inner surface, for example pipes for heat-producing elements made of zirconium alloys. Method includes loading and fixation of pipes in certain position, treatment of their inner surface by series supply with direction change of etch solution, water and compressed air, pipes unloading. Etch solution is provided by compressed air, each pipe is treated at three positions one by one, at first position etch solution is provided in one direction, then clean compressed air is provided in the same direction, at second position etch solution is provided in opposite direction, then clean compressed air is provided in the same direction, at third position water is provided, then clean compressed air, pipes treatment at each position is performed with jet break-up at outlet. Device contains frame, mechanism of delivery and unloading of pipes, mechanisms of pipes fixation, system for treating agents running through pipes consisting of pipelines, containers and valves. Frame contains three operation positions, mechanisms for pipes delivery to operation positions, on each position there are hard-mounted gaskets from the side of treating agents supply and moving-mounted gaskets along frame - devices for receiving from pipes with jet break-up of treating agents. System for treating agents running through pipes includes additionally intermediate containers connected to pipelines, through which etch solution and compressed air are run, and connected to treated pipes using gaskets.

EFFECT: development of device for effective jet etching of pipes inner surface.

7 cl, 3 dwg, 1 tbl, 1 ex