公开(公告)号：US20180099312A1

公开(公告)日：2018-04-12

申请号：US15726403

申请日：2017-10-06

Applicant: Nano and Advanced Materials Institute Limited

Inventor： Su Ping BAO ,  Lei GAO ,  Man Lung SHAM ,  Chun Ping WU ,  Chi Wai LI

IPC: B05D7/22 ,  B05D1/02 ,  B05D1/30 ,  F15D1/06 ,  F15D1/00

CPC classification number: B05D7/222 ,  B05D1/02 ,  B05D1/30 ,  B05D1/42 ,  B05D5/02 ,  F15D1/0035 ,  F15D1/004 ,  F15D1/0085 ,  F15D1/06 ,  F15D1/065 ,  F16L55/1654

Abstract: A method of applying a riblet structure coating on the internal surface of a pipe includes coating the internal surface of a pipe with a resin layer and applying a cavity mold having a reverse riblet pattern structure to the coated internal surface of the pipe. A flexible air bag is inserted into the interior of the pipe and charged with air to hold the mold against the coated internal surface of the pipe. The air bag may be charged with air for a sufficient amount of time to allow the coating to cure in the riblet shape of the mold. Afterwards, the air bag and the mold are removed from the pipe to yield a pipe coated with an internal riblet structure.