Poor adhesion cannot be solved by paint alone. Multiple processes such as pretreatment, degreasing, and gas release are involved.
One of the most common defects in aluminum die-cast painting is poor adhesion. When peeling or lifting of the paint film occurs, it is easy to suspect the paint or painting method; however, the actual cause often lies in the processes prior to painting. Particularly overlooked is the pretreatment. Aluminum die-cast parts tend to retain release agents and cutting oils, and if painting is done without sufficient degreasing, adhesion will decrease. Additionally, the oxide film on the surface can hinder paint adhesion. Furthermore, in processes with baking temperatures around 180°C, internal gases can expand, leading to blisters or pinholes. Environments with humidity over 60% and insufficient gas venting also increase the incidence of defects. In practice, there are cases where attempts are made to resolve issues by changing the paint, but this alone does not lead to fundamental improvements. It is important to review the entire process, including chemical treatment and gas venting. Poor adhesion is not an isolated defect; it is closely related to pinholes, blisters, and paint peeling. Understanding the entire process is the first step toward improving quality. We have prepared materials summarizing measures and improvement cases for poor adhesion in aluminum die-cast painting. If you are considering quality improvement, please make use of them.
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Preprocessing, degreasing, chemical treatment, curing temperature management, gas release.
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Measures for poor adhesion, quality improvement
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.
