The copper pinhole is crying due to "idle time."
Copper materials oxidize quickly, so they should not be left unattended. Immediate painting after polishing maintains adhesion.
Copper materials have a characteristic of rapid oxidation, making them prone to pinhole formation. If left uncoated for a long time after polishing, an oxide film forms, which reduces the adhesion of the coating. In particular, in high humidity environments, the oxidation reaction accelerates, and there are cases where gasification occurs during baking. Even if the appearance is clean, surface reactions are still progressing. As countermeasures, it is important to paint immediately after polishing and to shorten storage time. Additionally, managing air blowing after degreasing also affects adhesion. We provide detailed examples of improvements in copper materials in publicly available documents.
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Pinhole countermeasures and improvement methods
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Improvement of painting quality
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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.