Main methods for pickling precision seamless tubes:
Precision seamless steel tubes are mainly pickled using immersion pickling, jet pickling, and acid paste rust removal methods. Immersion pickling is generally more commonly used, while the jet method can be employed in large-scale production. Steel parts are typically pickled in a 10% to 20% (by volume) sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L, or 215g/L, the pickling solution should be changed. Under normal temperature conditions, steel can be pickled using a 20% to 80% (by volume) hydrochloric acid solution, which is less prone to over-corrosion and hydrogen embrittlement. Due to the significant corrosive effect of the acid on metal, a corrosion inhibitor needs to be added. After cleaning, the metal surface becomes silvery white, and the surface is passivated, enhancing the corrosion resistance of stainless steel. Learn about the main methods of pickling precision seamless steel tubes.
To eliminate adsorption on the diatomaceous earth carrier surface, refine tubes, and reduce tailing of chromatographic peaks, the carrier must be treated with acid or alkali washing before use. Acid washing involves boiling the carrier in 6mol/L hydrochloric acid for 2 hours or heating it with concentrated hydrochloric acid for 30 minutes, then filtering, rinsing with water to neutralize, and drying. Acid washing can remove impurities such as iron, aluminum, calcium, and magnesium on the surface but cannot remove silanol groups. Acid-washed carriers are suitable for analyzing acidic samples. The main method of acid washing for Wulan Buzha precision seamless tubes is knowledge.
Surface degreasing and descaling of precision seamless tubes are performed to prepare for subsequent process treatment. The primary method of pickling for Wulanbuqa precision seamless tubes is to remove surface oxidation scale during the production process, followed by lubrication treatment and then deep drawing processing. Without pickling, the surface of precision seamless tubes may have oxides and oil stains, which the phosphating solution cannot remove, thus reducing the quality of phosphating.