Camera Tripod Adapter Black Anodized Parts

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The Faults of Anode Oxidation in Aluminum Alloys Are:

The first:

The oxide film after anode oxidation of aluminum alloy is dim and lightless, sometimes producing spot corrosion, and in severe cases, black dot corrosion is significant, resulting in scrapping of parts and causing greater losses.

Such failures often occur by accident and are caused by special causes. In the process of aluminum alloy anode oxidation, the half-way power failure and re-electricity, often make the oxide film dim, and the half-way power failure parts in the cleaning tank stay too long, cleaning tank acid over high, water quality is not clean, including suspended matter, mud and sand, etc. more, will often make aluminum alloy parts electrochemical corrosion, the occurrence of spot corrosion black spots and so on.

The second:

Aluminum alloy products by anode oxidation treatment, the occurrence of local no oxidation film, showing the naked eye visible dark spots or streaks, oxide film has a tympanic tumor or hole phenomenon, although such failures are rare but also occur.

This is generally related to the composition, tissue and phase uniformity of aluminum and aluminum alloys, or to certain metal ions or suspended impurities dissolved in the electrolyte. The chemical composition, tissue and metal phase uniformity of aluminum and aluminum alloys affect the production and performance of oxide membranes. The oxide film of pure aluminum or aluminum magnesium alloy is easy to produce, and the quality of the film is also better. Aluminum-silicon alloy or aluminum alloy with high copper content, oxide film is more difficult to generate, and the resulting film darkening, graying, poor gloss. Selective oxidation or selective dissolution is easy to produce if the surface produces uneven metal phase, tissue bias, micro-impurity offset or uneven tissue caused by improper heat treatment. If the partial silicon content of aluminum alloy is partialized, it often results in local no oxide film or black spot stripes or local selective dissolution to produce holes. In addition, if the electrolyte has suspended impurities, dust or copper iron and other metal impurities ion content is too high, often make the oxide film black spots or black streaks, affecting the corrosion protection performance of the oxide film.

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