Why is the yellowing of aluminum aluminum products after cleaning?
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Typically, aluminum parts require ultrasonic cleaning (unless they're low-end products), and discoloration usually doesn't occur during the process. However, yellowing may appear shortly after rinsing or after some time has passed. The key here is that the problem is often related to the cleaning solution used.
The main factors affecting the color change in aluminum are the cleaning agent and water quality. While water quality is usually not the main concern, the type of cleaner plays a critical role. If the wrong chemical is used, it can lead to unwanted reactions on the surface of the aluminum, resulting in yellowing.
To properly clean aluminum parts, it's essential to use a specialized aluminum cleaner. These cleaners are typically neutral, with a pH around 7, ensuring they don’t chemically react with the metal. This helps preserve the original color and finish of the aluminum without causing damage.
In some cases, certain cleaning agents might leave a slight yellow tint, while others don’t. This is often due to the presence of mild alkaline components in the cleaner. Although such agents may not cause visible issues with standard aluminum parts, they can affect more sensitive surfaces like mirror-like finishes, leading to discoloration.
Therefore, when cleaning aluminum products, it’s highly recommended to use a completely neutral, specially formulated aluminum cleaning agent. This ensures optimal results, prevents discoloration, and maintains the integrity of the finished product.
Choosing the right cleaning solution isn’t just about effectiveness—it’s also about protecting the quality and appearance of your aluminum components. Always consult with suppliers or experts to find the best cleaner for your specific application.
*Material: BK7,Ge,UV-grade fuse silica(JGS1,JGS2,JGS3)or other optical materialsÂ
*Dimension Tolerance: +0.0 -- -0.1mmÂ
*Center Thickness: +/-0.1mmÂ
*Focal Length Tolerance: +/-1%
*Surface Quality:20/10Â
*Surface Figure: lambda/2 at 633nm on plano sideÂ
*Clear Aperture>90%
*Chamfer: 0.25mm at 45 degree typicalÂ
*Coating Optional