Research on Effect of Aluminum Pickling on Microstructure,Surface Zirconium Deposition and Scratching
The changes in surface elements and zirconium deposition of aluminum parts after alkaline washing,acid washing and passivation were studied using X-ray fluorescence qualitative full scan(XRF).Scanning electron microscopy(SEM)was used to analyze the changes in surface morphology of aluminum parts before and after alkaline washing,acid washing time variation and passivation.The experimental results show that the alkaline washing process can clean the surface sludge and poorly water-soluble polishing paste that affect the performance components of aluminum parts during the treatment process.However,the alkaline washing process can cause the surface of aluminum parts to form a loose structure,leading to a decrease in performance after coating.During the acid washing process,the surface of aluminum parts is adjusted to improve the harm caused by alkaline washing,making the surface flat and passivating uniformly and forming a film.However,the acid washing time should be controlled within 2-4 minutes.Less than 2 minutes will affect the surface flatness while more than 5 minutes will cause the passivation film to accumulate and burst,affecting adhesion and corrosion resistance.
万方数据
维普
