Stainless Steel Rust Causes and Treatments

What kind of stainless steel is not easy to rust?

The main factors affecting the rusting of stainless steel divides into 3 parts.

1. The content of alloying elements. Generally speaking, the content of chromium in 10.5% steel is not easy to rust. The higher the content of chromium and nickel corrosion resistance is better, such as 304 material nickel to be the content of 8 ~ 10%, chromium content of 18% ~ 20%, which is not rusty.

2. Smelting process of the production enterprise will also affect the corrosion resistance of stainless steel. Good smelting technology, advanced equipment and advanced technology that makes quality is stable and reliable, good intrinsic quality as well as rustless. Large stainless steel plant in the control of alloying elements, the removal of impurities, billet cooling temperature control can be guaranteed. On the contrary, some small steel plant equipment backward, backward technology, smelting process, impurities can not be removed, the production of products will inevitably rust.

3. External environment. Under climate dry and well ventilated environment, the productis not easy to rust. And air humidity, continuous rainy weather, or air containing acidity and alkalinity of the environment, the product is easy to rust. If the surrounding environment is too poor, 304 material stainless steel also will be rusty.

Stainless steel rust spots how to deal with?

1. Chemical methods. With pickling paste or spray to assist its rusty parts to reactivate the formation of chromium oxide film to restore its corrosion resistance, after pickling, in order to remove all the pollutants and acid residues, it is very important to carry out a proper rinse with water. After everything is processed and re-polished with polishing equipment, it can be closed with polishing wax. For local slight rust spots can also be used 1:1 petrol, oil mixture with a clean rag to wipe off the rust spots can be.

2. Mechanical methods of sandblasting clean up with glass or ceramic particles shot blasting cleaning, obliteration, brushing and polishing. Mechanical methods are possible to wipe away contamination caused by previously removed materials, polishing materials or obliterated materials. All kinds of contamination, especially foreign iron particles and humid environments, which can be a source of corrosion. Therefore, mechanically cleaned surfaces should preferably be formally cleaned under dry conditions. The use of mechanical methods only cleans its surface and does not change the corrosion resistance of the material itself. It’s recommended that mechanical cleaning be followed by re-polishing with polishing equipment and sealing with polishing wax.