Surface roughness is the cause of all adhesion failures and the truth behind the delamination chain.
A thorough explanation of the truth about surface roughness that causes painting defects.
【Problem】 Insufficient surface roughness significantly reduces the adhesion of the coating film, leading to painting defects. 【Causes and Issues】 - Many judgments are made based on the assumption that "it looks nice, so there is no problem." - If the surface is too smooth, the paint does not penetrate sufficiently. - This is particularly impactful with stainless steel and aluminum materials. - It may manifest as peeling of the coating film a few months later. - It can be difficult to judge visually. 【Management Standards and Guidelines】 The recommended surface roughness is approximately Ra 1.0 to 2.0 micrometers. It can be challenging to assess roughness visually. It is important to manage numerical values. 【Improvement Examples and Effects】 By managing surface roughness numerically, adhesion is greatly improved. Actual improvement cases are detailed in publicly available materials. The enhancement of adhesion significantly improves the long-term durability of the coating film.
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basic information
Target materials: Iron, stainless steel, aluminum | Main issues: Poor adhesion, paint film peeling | Standard value: Ra 1.0 to 2.0 μm
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Pre-treatment, surface treatment, and overall metal coating process for metal parts.
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.
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