The overly rough surface was the culprit of the pinholes; the essence of pre-treatment management.
The importance of the balance of roughness in determining paint quality.
【Problem】 If the surface roughness is excessively high, it can lead to poor painting results. 【Causes and Issues】 - If the blast pressure is too high, deep irregularities are formed. - The paint does not spread evenly. - Air or solvents remain trapped within the paint film. - This leads to pinholes and uneven film thickness. - An outdated belief that "a mirror finish is good" influences this issue. 【Management Standards and Guidelines】 It is important to ensure a surface that is not too rough (approximately Ra 1.0 to 2.0 micrometers). Proper setting of blast pressure is essential. Regular surface inspections are necessary. 【Improvement Examples and Effects】 By managing the roughness to appropriate levels, the incidence of pinholes significantly decreases. Uneven film thickness is also improved, stabilizing quality.
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basic information
Target materials: Iron, stainless steel, aluminum | Main issues: Pinholes, film thickness variation | Reference values: 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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