Pickling passivation device of urea class stainless steel pipeline

The utility model discloses a pickling passivation device of a urea class stainless steel pipeline, and belongs to the field of pickling passivation devices. The pickling passivation device comprises a pickling solution tank and a deionized water solution tank. The pickling solution tank is connected with a pickling pump through a pipeline, the pickling pump is connected with the stainless steel pipeline needing pickling passivation through a valve, and the stainless steel pipeline is connected with a filter; the output end of the filter is connected with an inlet of a solenoid valve through a pipeline, a first outlet of the solenoid valve is connected with the pickling solution tank, and a discharging valve is arranged at the lower end of the filter; the deionized water solution tank is connected with a centrifugal pump through a pipeline, the centrifugal pump is connected with the valve, and the deionized water solution tank is connected with a second outlet of the solenoid valve through a pipeline to form a circulation loop with the stainless steel pipeline. The pickling passivation device can effectively carry out the pickling passivation on the pipeline, a metal protection film is formed on the surface of the inner wall of the pipeline, cleanliness of the inner surface in the pipeline can reach more than the NAS8 level, and the service life of the pipeline is prolonged.