Surface roughness is the cause of all adhesion failures and the truth behind delamination chains.
The peeling of paint and poor adhesion are relentless. The cause may not be the paint itself, but rather a decrease in the adhesion area due to insufficient surface roughness.
Surface roughness is an important pre-treatment condition that affects the adhesion of the paint film. However, in the field, there are many cases where it is judged that "there is no problem because it looks nice." In reality, if the surface is too smooth, the paint may not penetrate sufficiently, leading to poor adhesion or peeling. This is especially significant with stainless steel and aluminum materials, where it may manifest as paint film lifting months later. This is actually a point that is often overlooked. Insufficient roughness can be difficult to assess visually. Furthermore, it is sometimes recommended to aim for a surface roughness of about Ra 1.0 to 2.0 micrometers before painting. Insufficient roughness increases the likelihood of pinholes and paint film peeling. A common misconception in the field is the belief that "a mirror finish is better." By managing surface roughness numerically, there are cases where adhesion can be greatly improved. Actual improvement cases are also detailed in publicly available materials.
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Metal coating pre-treatment
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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.
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