The quality of the pre-treatment greatly affects adhesion. What processes should be checked before the paint and equipment?
In aluminum die casting painting, it is not an exaggeration to say that the pre-treatment determines the quality. No matter how high-performance the paint used is, if the pre-treatment is insufficient, it can lead to poor adhesion and paint film peeling. One often overlooked factor is the specific contaminants of the material. Aluminum die casting tends to retain release agents and processing oils, and if painting is done without adequate degreasing, the paint film will not adhere properly. Additionally, the oxide film can also cause a decrease in adhesion. Furthermore, in baked coatings, heating to around 180°C can cause internal gases to expand, potentially leading to blisters and pinholes. Therefore, gas countermeasures during the pre-treatment stage are also important. On-site, there is often a tendency to focus solely on the painting process, but many issues arise before painting. By properly performing degreasing, surface adjustment, and chemical treatment, adhesion and durability can be improved. To stabilize quality, it is necessary to manage not only the painting conditions but the entire pre-treatment process. We have published materials summarizing cases where improvements were made by reviewing the pre-treatment process. If you have similar challenges, please refer to them.
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basic information
Degreasing process, surface adjustment, chemical conversion treatment, process management
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Applications/Examples of results
Improvement of preprocessing processes, enhancement of adhesion.
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.
