The oxidation and colouring of die-cast aluminum often show white spots. To ensure that the colour difference of the product is within the tolerance range and meets customer requirements. The key to solving this problem is to understand the reason.
The following will introduce the causes and treatment methods for everyone:
If the washing is not clean, strengthen the washing.
Dirty water can easily contaminate the film during washing. Therefore, the water needs to replace to ensure the washing quality.
The oxide film is polluted by smoke, dust, acid, and alkali mist in the air. Therefore, it is necessary to strengthen washing, timely dyeing, and transfer to solve this problem.
The oxide film is contaminated by oil stains and sweat stains. The product needs to be protected, and the product's surface cannot touch by hand.
Although insoluble impurities exist in the industry, they are contaminated and cannot be dyed. At this time, the dye solution should be filtered or replaced, and Clean the bath regularly.
There is residual acid flowing out of the gaps and deep holes of the product, and clean the product with water.
The dye solution is contaminated, causing pitting corrosion of the dyed workpiece. The dye needs to be replaced, and care should be taken to avoid introducing impurity ions during the operation.