In engineering, pickling and passivation treatment is usually carried out, so that the corrosion potential of Stainless steel pipe fittings can be exerted even more. Usually, thorough cleaning, including alkali cleaning and acid cleaning, and passivation with oxidizing agent are required to ensure the integrity and stability of the passivation film. One of the purposes of pickling is to create favorable conditions for passivation treatment and ensure the formation of a high-quality passivation film. Because the surface of Stainless steel pipe fittings is corroded by an average of 10 microns thick by pickling, the chemical activity of the acid liquid makes the dissolution rate of the defective parts higher than other parts on the surface, so the pickling can make the entire surface tend to be evenly balanced. , Some of the hidden dangers that were easy to cause corrosion have been removed. But more importantly, through pickling passivation, the iron and iron oxides are dissolved preferentially than the chromium and chromium oxides, and the chromium-poor layer is removed, resulting in the enrichment of chromium on the surface of the stainless steel. This chromium-rich passivation film The composition and structure improve the corrosion resistance of Stainless steel pipe fittings. The surface cleaning, pickling and passivation of Stainless steel pipe fittings not only maximize the corrosion resistance, but also prevent product contamination and obtain beautiful appearance.

Pickling and passivation can be two or one process. According to the requirements of Stainless steel pipe fittings, different treatment methods can be changed.
1. There is welding on the surface of the product, and the welding spot needs to be removed. It is recommended to do two-in-one pickling and de-soldering (low cost) and pickling passivation (one-step de-soldering and anti-rust)
2. There is no welding on the surface of the product, just want to improve the anti-rust performance of the product or the surface of the product requires silver white at the same time for surface anti-rust. It is recommended to do natural passivation treatment (low cost and high anti-rust performance) and pickling passivation two-in-one (the surface can be turned into silver white and anti-rust in one step)

The above is about the related treatment of pickling and passivation of Stainless steel pipe fittings after annealing. I believe that everyone has a deeper understanding of becoming more pickling and passivation.