The pinholes in aluminum coating are caused by insufficient drying. It is important to treat the surface to allow internal moisture to escape.
Pinholes that occur in aluminum products can sometimes be caused by moisture remaining on the surface or inside the material. Special attention is needed, particularly after machining or insufficient drying following cleaning. During baking, moisture evaporates and can push up the coating, resulting in tiny holes. Aluminum has a high thermal conductivity, causing the surface temperature to rise rapidly, which can prevent internal moisture from escaping. The risk of occurrence increases, especially with a film thickness of 40μm or more. Measures to address this include pre-drying at 60-80°C and managing the storage environment before painting. Additionally, care must be taken to prevent moisture re-adhesion in environments with humidity above 70%. We also provide detailed examples of improvements specific to aluminum materials in our published materials.
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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.
