METHOD FOR ELECTROPLATING ON INSIDE SURFACE OF PIPE

摘要

PURPOSE:To form easily a pinhole-free plating layer having a uniform thickness in the stage of electroplating Ni and Cu, etc. on the inside surface of a steel pipe by disposing anodes in the central part of the steel pipe, rotating the steel pipe and performing plating while circulating the plating liquid in the steel pipe. CONSTITUTION:Anodes 7 are attached correctly to the longitudinally central part of a steel pipe 4 by using many non-conductive spacers 5 in the stage of forming a plating layer of a metal such as Ni, Cu or the like on the inside surface of the pipe 4 by electroplating. The pipe 4 is rotated around the anodes 7 on a driving roller 8 and guide rollers 9. At the same instant, a plating liquid is circulated through a plating liquid pool 1, a filter 2, a swivel joint 6, the pipe 4 and the joint 6. Electricity is conducted to the anodes 7 and the pipe 4 as a cathode while the spacers operated by a handle 12 move back and forth the anodes 7 in the longitudinal direction of the steel pipe, by which the pinhole- free plating layer having a uniform thickness is formed.