In general, the composition of a single pure metal material is not easy to rust. Processed metal in the humid air is prone to rust corrosion phenomenon; and a piece of pure iron even if placed in water will not rust. Stainless steel welding, is spliced on by the welding rod, belongs to the heating processing treatment, resulting in the iron element is not pure, encountered moisture and oxygen in the air, it is easy to rust.
The method of stainless steel welding processing will also lead to stainless steel material rust. If the metal sheet is folded and corrected by knocking, the place of the crease is also easy to rust.
The smoothness of the metal surface and the size of the probability of rust also have a certain relationship. Smooth metal surface is not easy to rust, while the rough metal surface is more likely to rust. Localized overheating of the metal surface or the surface temperature increases due to external hammering and processing, is also one of the reasons for the rusting of the metal surface.
Stainless steel welding rust treatment program:
1. surface polishing. Stainless steel weld roughness and the surface can have welding stains, will accelerate the oxidation of rust outside the weld. If the stainless steel weld for electrolysis or grinding and polishing, can improve the weld surface oxidation resistance, because the smaller the surface roughness of the metal, the better the corrosion resistance. Because the polished stainless steel weld surface can produce a layer of dense, uniform oxide film, protect the internal metal to reduce the probability of oxidative corrosion.
2. Pickling passivation treatment. The purpose of pickling is to clean off the stainless steel weld oxides, and then produce a layer of dense passivation film on the metal surface, increase the surface of the ability to prevent corrosion and oxidation.
Post time: May-16-2024