The real reason why pinholes don't decrease! Insufficient degreasing leads to defects.
Countless small holes appearing on the painted surface. We will address the fundamental causes that cannot be solved by merely adjusting the viscosity of the paint.
[Cause of Occurrence] Pinholes (bubbles) that occur on the painted surfaces of automotive parts are defects that significantly impair appearance quality. On-site, the mixing ratio of thinner and the viscosity of the paint are often suspected, leading to repeated adjustments in the formulation. [Truth] In reality, many pinholes are caused by air trapped in oil or moisture that remains in the gaps of the material, or by air trapped in the "voids" characteristic of aluminum die casting, which expands during curing and breaks through the paint film. This phenomenon is often mistakenly identified as foreign matter contamination. [Improvement Measures] To prevent this, it is essential to extend the setting time by 3 to 5 minutes longer than usual to allow volatile gases to escape slowly, and complete drying during pretreatment is crucial. For temperature management guidelines aimed at fundamentally eliminating pinholes, please download our free materials for more information. [Summary] Addressing pinholes is not only about adjusting the paint but also about controlling the discharge of air and moisture trapped in the material. Eiwa Kogei Co., Ltd. will solve all your concerns related to metal painting, including poor adhesion of zinc die casting and aluminum die casting.
basic information
Corresponding materials: Aluminum die casting, zinc die casting, iron / Degreasing liquid temperature: 50-55 degrees management / Dry baking process: 100 degrees, 5-10 minutes / Humidity management: below 60 percent / Pinhole occurrence rate: below 0.5 percent
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Applications/Examples of results
Automotive parts, aluminum die casting, zinc die casting
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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.