The overly rough surface was the culprit of the pinholes; the essence of pre-treatment management.
Are you noticing an increase in pinholes and film thickness variation after blast treatment? The excessive management of surface roughness may actually be the cause.
Surface roughness is important for improving adhesion, but being rough is not necessarily good. Excessive roughening can, on the contrary, lead to poor painting results. Particularly when the blasting pressure is too high, deep irregularities can form on the surface, preventing the paint from spreading evenly. As a result, air or solvents may remain trapped within the paint film, leading to pinholes or uneven film thickness. This is actually a point that is often overlooked. Excessive roughness affects not only adhesion failure but also appearance defects. Furthermore, it is common to manage blasting pressure at around 0.3 to 0.5 megapascals as a standard. Excessive projection can also lead to material deformation. A common misunderstanding in the field is the belief that "the rougher, the better the adhesion." By optimizing surface roughness, quality can often be stabilized. Actual improvement cases are also detailed in publicly available materials.
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Metal surface preparation before painting
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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.
