Common treatment method for seamless tube pickling and passivation

1. The pickling passivation seamless tube dipping method.

The method is applicable to stainless steel pipelines, elbows, small parts, etc. And the treatment effect is good. Because the treated part can be fully immersed in the pickling passivation solution, the surface of the pickled passivated seamless tube is completely reacted, and the passivation film is dense and uniform. This method is suitable for continuous batch operations, but it is necessary to continuously replenish new liquid as the reaction concentration of the solution decreases. The disadvantage is that due to the limitation of the shape and capacity of the acid tank, it is not suitable for large-capacity equipment and pipelines that are too long or too wide; if they are not used for a long time, the effect will be reduced due to volatilization of the solution, etc., and a special site, acid tank and heating equipment are required.

2. pickling passivated seamless tube plaster method.

Stainless steel pickling passivation paste has been widely used in China and has a series of product supplies. It is manually operated and suitable for on-site construction. Welding treatment of stainless steel chemical containers, welding discoloration, corner dead ends, escalator back and large areas of passivation are all used. Be applicable. The advantages of the paste method are that no special equipment and site are needed, no heating equipment is required, the site is flexible, the pickling and passivation are completed at one time, and the sex is strong; the passivation paste has a long shelf life, and each application process uses new passivation paste. After the passivation of the surface layer is finished, the reaction stops, it is not easy to be over-corroded, and it is not limited by subsequent flushing time. Weakness such as welds can also strengthen passivation. Disadvantages are poor operating environment for workers, high labor intensity, high cost, and poor treatment of the inner wall of stainless steel pipelines, which need to be combined with other methods.