1. Cleaning: Use solvents and emulsions to clean the steel surface to remove oil, grease, dust, smoothing agents and similar organic matter, but it cannot remove rust, scale, flux, etc. on the steel surface, so it is anti-corrosion, only Used as an auxiliary technique.
2. Rust removal: First, use a steel wire brush to polish the appearance of the steel, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of the manual opening tool can reach the Sa2 level, and the rust removal of the power supply can reach the Sa3 level. If strong iron oxide scale is attached to the steel surface, the rust removal effect is not a delusion, and the anchoring depth required for the anticorrosive structure cannot be achieved.
3. Pickling: Pickling is carried out by two methods: ordinary chemical and electrolysis. Pipeline anticorrosion can only be chemically pickled, which can remove oxide scale, rust, and old coatings. Sometimes it can be used as sandblasting after rust removal. Chemical cleaning has strong cleaning ability, but it will inevitably cause rough appearance, and its anchoring pattern is shallow, which is easy to cause pollution.