Insufficient degreasing can trigger malfunctions. An explanation of the importance of the often-overlooked degreasing process.
One of the most common causes of poor adhesion in aluminum die-cast painting is insufficient degreasing. If painting is done while release agents or processing oils remain on the surface of the material, the paint cannot adhere directly to the material, leading to paint film peeling. Particular attention should be paid to oil residues that cannot be confirmed visually. Even if the surface appears clean, just a small amount of oil residue can significantly reduce adhesion. While the painted surface may look fine immediately after painting, there are cases where peeling occurs weeks later. Moreover, insufficient degreasing not only leads to poor adhesion but can also cause blisters and pinholes. This is because oils can volatilize during the curing process at around 180°C, causing defects within the paint film. In practice, there may be attempts to shorten the degreasing process to improve productivity, but this often results in increased costs for re-coating or handling complaints. The first step in addressing poor adhesion is to standardize the degreasing process and review the management conditions. We have prepared materials summarizing examples of defects caused by insufficient degreasing and points for improvement. Please use them as reference materials for process improvement.
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basic information
De-fat management, oil content inspection, cleaning conditions, standardization.
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Applications/Examples of results
De-fatting process improvement, defect reduction.
Company information
We are not just a "subcontracted painting factory." Established in 1958, our company has a foundation of painting technology and also specializes in chemical treatment, stripping, and cleaning, functioning as the "external surface treatment department" in your organizational chart. Based on our philosophy of "preparation is eight-tenths of the work," we emphasize participation from the "upstream process" before the drawings are finalized. We conduct test painting on a wide range of metals and difficult materials, and we produce the entire process from assembly, packaging, to delivery, thereby reducing your management workload. Additionally, by being able to perform zinc phosphate treatment in-house, we achieve stable painting quality. Furthermore, our micro-heating stripping technology, which does not use chemicals, maintains the electrical state of the "jigs (hangers)" that influence painting quality. Our approach of "pre-treatment determines painting quality" ensures the stability of the paint film during mass production. Rather than simply "applying specified standards," we work backwards to achieve optimal painting specifications and prevent scratches during transportation, sparing no effort in thorough discussions from the outset. This diligent preparation is the shortest path to preventing rework and minimizing total costs. From the development stage, please utilize the expertise of our specialists as part of your production line.
