1. Rust removal grade: For alloy pipes commonly used with epoxy, vinyl, phenolic and other anti-corrosion coatings, the general requirement is to achieve a near-white level on the surface of the alloy pipe. Practical evidence shows that this rust removal grade can almost eliminate all oxide scale, rust, and other contaminants, fully meeting the adhesion requirements of the anti-corrosion layer and the alloy pipe. The shot blasting rust removal process can reliably achieve near-white level quality at a lower cost.
2. To achieve an ideal rust removal effect, it is necessary to select abrasives based on the hardness of the alloy pipe surface, original rust level, required surface roughness, coating type, etc. Single-layer epoxy or two-layer or three-layer polyethylene coatings require a mixed abrasive of steel shot and steel grit to achieve an ideal rust removal effect. This is because steel shot strengthens the steel surface while steel grit etches it.
3. To obtain better uniform cleanliness and roughness distribution, the design of abrasive particle size and ratio is quite important. Excessive roughness can easily cause thinning of the anti-corrosion layer at peak points of anchor patterns. Additionally, if anchor patterns are too deep, it can easily lead to bubble formation during corrosion protection processes, severely affecting the performance of the anti-corrosion layer.
4. Before shot blasting treatment, remove grease and dirt from the surface of the alloy pipe. The pipe body can also be preheated in a heating furnace to 40-60 degrees Celsius to keep the surface of the alloy pipe dry since it should be free from grease and other contaminants. This enhances rust removal effectiveness; furthermore, a dry surface on the alloy pipe facilitates separation between steel shot, steel grit, rust, and oxide scale, resulting in a cleaner surface after rust removal. | 
