Configuration of different abrasives during spray rust removal

　　1. Effects of different types of abrasives Steel grit: Very effective in removing rust and increasing roughness. Steel shot: very good at removing oxide scale, slightly less rough. Steel wire shot cutting: The rust removal effect is very good when it is first put in, and the roughness is increased. The oxide scale removal effect is very good after rounding, but the roughness is slightly worse, and it is more suitable for use in shot blasting machines. Non-metallic abrasives: disposable abrasives, mainly used for rust removal of non-ferrous base materials or non-fixed areas, with slightly poor roughness.

　　2. Pretreatment (applying shop primer) In the pretreatment stage, the base material is almost covered with oxide scale. Steel shot is the main choice. Usually 100% steel shot can be used.

　　3. Small steel structural parts Small steel structural parts have a short processing cycle and usually do not undergo pretreatment. At this time, the surface of the base material is mostly oxide scale, and the abrasive configuration can be steel grit: steel shot = 40%: 60%. (If shot blasting is used for rust removal, the steel sand can be replaced by steel wire shot)

　　4. Large steel structural parts The processing cycle of large steel structural parts is long and usually does not undergo pretreatment. At this time, the surface of the base material is mostly rusted, and the abrasive configuration can be Steel grit: steel shot = 70%: 30%. (If shot blasting is used for rust removal, the steel sand can be replaced by steel wire shot)

　　5. Large steel structure segments (pretreated) The processing cycle of large steel structure segments is long and usually undergoes pretreatment. At this time, the surface of the base material is mainly It is covered with shop primer and has less rust. The abrasive configuration can be steel sand: steel shot = 70%: 30%. (A certain proportion of steel wire cut pills can be added appropriately)