What is the surface treatment of L360 spiral welded pipe?

The quality of the passivation film of L360 spiral welded pipe will directly affect the service life of the parts and the appearance of the product. The main factors affecting the quality of the passivation film are the composition of the material and the quality of the passivation solution. Because of the thick, dense and complex oxide scale formed on the surface of the parts, the pickling of such parts is relatively more complicated. To remove this kind of oxide scale, follow the steps of loosening oxide scale, pickling and removing ash.

(1) Loose oxide skin

(2) Pickling operation: After the oxide scale is loosened, a layer of ash is often attached to the surface of the part. After the ash is removed, the oxide scale is passivated.

The operation procedure of removing ash is as follows: the parts after the passivation process pickling is poor in corrosion resistance in the air, if exposed to the air, the surface of the parts will rust. In order to enhance the corrosion resistance of parts, a dense and good corrosion resistance passivation film is formed on the surface of the parts to achieve the purpose of corrosion resistance.