Aluminum blackening formula
Anodic oxidation of aluminum is aluminum or Aluminum Alloy anode to lead as cathode in sulfuric acid, oxalic acid, chromic acid and aqueous solution electrolysis, so that the surface oxide film. The anodic oxidation process is most widely used. Aluminum and Aluminum Alloy sulfuric acid anodizing oxidation film has high adsorption capacity, easy sealing alone or with colored more to improve the corrosion resistance of anodic oxide film thickness and appearance. The process is generally Aluminum Alloy sulfuric acid anodizing electrolyte has the advantages of simple operation, stable, cost is not high, the process is mature, but in sulfuric acid anodized process often unavoidable failure occurred, influence of oxide film quality. The following detailed analysis about the failure reasons, then give some preventive measures for your reference:Common faults and analysisAluminum Alloy products by sulfuric acid anodic oxidation, partial oxidation without touch, showing visible black spots or stripes, film drums or holes. The failure phenomenon of tumor is rare but has occurred.Dr. al website has detailed knowledge
Anodic oxidation of aluminum is aluminum or Aluminum Alloy anode to lead as cathode in sulfuric acid, oxalic acid, chromic acid and aqueous solution electrolysis, so that the surface oxide film. The anodic oxidation process is most widely used. Aluminum and Aluminum Alloy sulfuric acid anodizing oxidation film has high adsorption capacity, easy sealing alone or with colored more to improve the corrosion resistance of anodic oxide film thickness and appearance. The process is generally Aluminum Alloy sulfuric acid anodizing electrolyte has the advantages of simple operation, stable, cost is not high, the process is mature, but in sulfuric acid anodized process often unavoidable failure occurred, influence of oxide film quality. The following detailed analysis about the failure reasons, then give some preventive measures for your reference:Common faults and analysisAluminum Alloy products by sulfuric acid anodic oxidation, partial oxidation without touch, showing visible black spots or stripes, film drums or holes. The failure phenomenon of tumor is rare but has occurred.Dr. al website has detailed knowledge
Blackening is a common method used in metal heat treatment. The principle is to produce a layer of oxide film on the surface of metal so as to isolate the air and achieve the purpose of anti rust. The appearance of requirements is not high by blackening a blackening process, mainly by the following steps: 1) 2): degreasing cleaning; the workpiece must be completely immersed in the degreasing solution; degreasing solution concentration pH value 12-14, processing time 10-30min, every 3-5 minutes on shake a few times, the concentration of less than pH12 when adding defatted powder; washing; 3) 4): pickling pickling liquid concentration pH value 2-4, the processing time of 5-10min; 5) washing; 6): black pool concentration pH value 2.5-3.5, the processing time of 10-12min; 7) washing; 8) dry; 9) oil. The beneficial effects of the invention are as follows: 1., the blackening is safe, the electricity is not required; the alkaline blackening is required at high temperature; the utility model needs 100% electricity. 2. improve work efficiency: 1-2 minutes. 3. black, low cost, simple equipment, easy to operate, black time has been strictly controlled.
