Coating method for the inner surface of metal capillary tubes and metal capillary tubes with inner surface electroplating coating

Abstract

[Problem] To provide a metal capillary tube with excellent corrosion resistance, low cost, and high versatility. [Solution] A method for coating the inner surface of a metal capillary tube, characterized in that: liquid electrocoating paint is fed into a metal capillary tube already filled with electrocoating paint, and a DC voltage is applied to electrocoat the inner surface of the aforementioned metal capillary tube; and a metal capillary tube, characterized in that: the inner surface of the metal capillary tube is electrocoated.