Surface treatment method of spiral steel pipe

1. Cleaning

    Use solvents and emulsions to clean the surface of steel to remove oil, grease, dust, smoothing agent and similar organic matter, but it cannot remove the rust, oxide scale, welding flux, etc. on the surface of the steel, so it is only used as an auxiliary trick in anti-corrosion production.

2. Tools to remove rust

    First, use wire brushes and other tools to polish the surface of the steel to remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface adheres to a strong oxide scale, the tool rust removal results are not satisfactory and the anchor pattern depth required for anti-corrosion construction cannot be reached.

3. Pickling

    Generally, two methods of chemical and electrolysis are used for pickling. Pipeline anticorrosion only uses chemical pickling, which can remove oxide scale, rust, and old coatings. Sometimes it can be used as sandblasting and rust removal. Chemical cleaning can certainly make the appearance reach a certain degree of cleanliness and roughness, but its anchor lines are shallow and easily pollute the situation.

4. Spray (throw) to remove rust

    Spraying (throwing) rust removal is a high-power motor that drives the spraying (throwing) blade to twist at a high speed, so that the steel grit, steel shot, iron wire section, minerals and other abrasives are sprayed (projected) on the surface of the steel pipe under the effect of centrifugal force. , Not only can completely eliminate rust, oxide and dirt, but also the steel pipe can reach the required average roughness under the effect of the fierce abrasive impact and friction.

    After spraying (throwing) to remove the rust, not only can the physical adsorption effect of the pipe surface be expanded, but also the mechanical adhesion effect of the anti-corrosion layer and the pipe surface can be enhanced. Therefore, spray (throwing) rust removal is an ideal rust removal method for pipeline anticorrosion. Generally speaking, shot blasting (sand) rust removal is mainly used for the internal and external surface treatment of the pipe, and shot blasting (sand) rust removal is mainly used for the surface treatment of the pipe.