To achieve a hard surface on aluminum sheets, an oxidation treatment process is applied to certain aluminum workpieces. This process not only enhances the performance of the aluminum sheets but also improves their aesthetic appeal. However, it is crucial to pay attention to certain matters after the oxidation treatment, as failure to do so may result in subpar performance of the aluminum workpieces or even early damage.

One: Hot Water Rinse

The objective is to age the coating layer, but the water temperature and time must be strictly controlled. Excessive water temperature can lead to a reduction in coating thickness and a lighter color. Overlong processing time can also result in similar issues. The suitable temperature and time are: 40~50℃ for temperature, 0.5~1 minute for time.

II. Drying

Drying should be done naturally. Workpieces that have been stuffed with hot water should be hung diagonally on a rack, allowing the free water on the working surface to flow downward in a straight line. Any water droplets at the bottom corner should be absorbed with a towel. The film dried in this manner retains its color without being affected, appearing natural.

III. Aging

The aging method can be determined based on climatic conditions. In the summer with sunlight, items can be exposed to direct sunlight. During rainy days or winter, they can be baked in an oven. The process conditions are: temperature between 40-50°C, time of 10-15 minutes.

Section 4: Repair of Non-Conforming Items

Defective conductive oxide coating parts should be removed prior to the drying and aging process, as the coating becomes more difficult to remove after drying and aging, which can also affect the surface roughness of the workpiece. For defective parts, we can take the following simple measures to address the issue.

The art of anodizing aluminum requires that workpieces be cleaned with organic solvents prior to undergoing heat treatment or welding processes to remove surface oil污. However, this is generally not achieved, resulting in a layer of carbonized residue formed from the baked oil on the workpiece surface. This residue is difficult to remove in organic solvents and can cause localized corrosion when soaked in alkaline solutions, leading to pitting or uneven surfaces, severely affecting product quality.