304 stainless steel elbow, in the pipeline system, connect two pipes with the same or different nominal diameters to make the pipeline bend at a certain angle.
The chemical process of 304 stainless steel elbow to remove the oxidation of the stainless steel surface is called to delay the corrosion rate of the metal and is the pickling passivation of stainless steel. Remove oxide scale and rust on the surface of steel. A very thin passivation film is formed on the surface, which completely separates the metal from the corrosive medium, prevents the metal from contacting the corrosive medium, and forms a passive state to achieve the effect of anti-corrosion. The pickling and passivation process, the cleaning surface of the elbow is degreasing-clean water rinse-pickling-passivation-clean water rinse-blow dry.
304 stainless steel elbows are subjected to pickling and passivation pretreatment for the stainless steel pipe fittings after manufacture according to the requirements of the process documents. Surface treatment: remove spatter, oil stains, oxide scale, etc. from the weld seam. Clean the welding seam and the welding slag on both sides, clean it, use stainless steel wire brush, stainless steel spatula or grinding wheel to remove, rinse with clean water after cleaning. Use gasoline or cleaning agent to remove dirt on the surface of pipe fittings. When the oil dirt is serious, use 3-5% alkaline solution to remove the dirt and rinse it with clean water. The oxide scale of stainless steel hot-worked parts can be removed by mechanical sandblasting, and the sand must be pure silicon or alumina. Rinse it out with clean water (chloride ion content in the water does not exceed 25mg/l). Formulate safety measures for pickling and passivation, and determine necessary utensils and labor protection articles.