What problems usually occur in the anodizing process of Changshu? Whether aluminum is natural oxidation, electrochemical oxidation, chemical oxidation, alkaline oxidation, acid oxidation or anodizing, the composition of its oxide film is the same, mainly Al2O3. The composition of this film can protect the aluminum matrix from continuous oxidation and corrosion, and will not rust like iron after years. We continue with the problems in the anodizing process introduced last time.

The thickness of anodic oxide film in Changshu is uneven. The film thickness of one piece of material or the film thickness of the upper and lower parts of the same hanging material is different, and the hanging workpiece is too dense; Improper area ratio of anode and cathode; The temperature difference between the upper and lower tank liquid is too large. Adjust the distance between hanging materials and between anode and cathode. Reasonably arrange the cathode; Increase the circulation of tank liquid. Uneven film thickness is prone to uneven dyeing. You can also try uniform dyeing with ht429 dyeing inhibitor.

The hardness of Changshu anodic oxide film decreased (soft film). The hardness or wear resistance of anodic oxide film decreases, hard anodic oxidation is more common, and the bath temperature or sulfuric acid concentration is high; Insufficient circulation or stirring of tank liquid. Reduce tank temperature and strengthen mixing

Membrane burning. Local catastrophic etching of anodic oxide film with different degrees, or accompanied by metal dissolution, local overheating during anodic oxidation, especially in the large precipitation position of intermetallic compounds of high copper aluminum alloy. Maintain good mixing; Maintain the tank liquid temperature; To control the rising speed of current, it is best to use pulse power supply for anodizing

Changshu anodizing. Cracks are found in the oxide film (after oxidation, sealing, atmospheric exposure or bending processing), and the stress due to expansion occurs in boiling water sealing; Hard oxidation occurs due to high current density; The plasticity of anodic oxide film is not enough. Take measures against symptoms; After cold sealing, soaking in hot water improves the plasticity of oxide film. In addition, sealing ash is easy to appear in boiling water sealing. It is recommended to use ht410 sealing ash remover for treatment and prevention.