In an era where the adoption of aluminum parts is advancing, the concept of substrate management to prevent paint peeling.
In the lightweight automotive parts, the adhesion of aluminum coatings and the management of pre-treatment become important.
■Cause of Occurrence: The importance of aluminum parts is increasing due to trends in weight reduction and cost management. Aluminum is lightweight and has excellent workability, but if painted with the same approach as iron, issues such as poor adhesion, paint peeling, pinholes, and blisters can occur. The three points to check are the residue of processing oil, the condition of the oxide film, and the drying after pretreatment. ■Truth: Peeling is not just a matter of paint selection. With weight reduction, shapes have become more complex, increasing ribs, holes, corners, and thin sections, making it easier for cleaning agents and moisture to remain. Even if the surface is clean at the time of shipment, peeling can become apparent during assembly or storage. ■Improvement Measures: Treat aluminum as a material where quality differences arise during pretreatment, managing degreasing, surface adjustment, and drying with numerical records. In the event of peeling, revert to check the pretreatment, film thickness, and curing conditions of the same lot. Please utilize documents that allow you to verify pretreatment, drying, and film thickness conditions.
basic information
Confirmation of three points: remaining processing oil, condition of the oxide film, drying after pretreatment / Corresponding material: aluminum (lightweight parts) / Key areas: ribs, holes, corners, thin sections / Measures against poor adhesion, peeling, pinholes, and blisters / Lot tracking management.
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Applications/Examples of results
Automotive parts, lightweight components, complex aluminum parts.
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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.