Why Stainless Steel Bars Need Pickling
Why Stainless Steel Bars Need Pickling
Importance of Pickling
Pickling is crucial before stainless steel passivation. It involves using an acidic solution to clean the stainless steel surface by removing the oxide layer, welding slag, and heat treatment oxides.
Methods of Pickling
Common methods include:
- Hydrochloric Acid Pickling
- Nitric Acid Pickling
Benefits of Pickling
After pickling, the stainless steel surface becomes smoother, facilitating the subsequent passivation process.
When Pickling Is Necessary
Not all workpieces require pickling. The necessity depends on the workpiece’s surface shape. Adding this step ensures the surface is clean and flat, providing better conditions for passivation.
Enhanced Passivation
Pickling makes the passivation film more uniform, improves the passivation effect, and enhances performance in salt spray tests.
