Insufficient rust prevention is the cause of all rust reoccurrence: the truth within the coating.
Has rust reappeared after a while since painting? The cause may not be the paint film, but rather corrosion of the substrate due to insufficient rust prevention treatment.
Rust that reappears after painting may not be due to the paint film itself, but rather insufficient anti-corrosion treatment. However, on-site, it is often mistakenly judged that "since it has been painted, it won't rust." In reality, if fine red rust or corrosion components remain on the surface of the material, corrosion can progress inside the paint film and manifest as reappearing rust months later. This is especially significant at welded joints and cut surfaces, where the effects of insufficient anti-corrosion treatment are more pronounced. This is actually a point that is often overlooked. Even if it looks clean on the outside, corrosion reactions are progressing inside the paint film. Furthermore, if anti-corrosion primer is not applied after blast treatment and left unattended, reappearing rust can rapidly progress in conditions of over 60 percent humidity. A common misconception on-site is the belief that "if the topcoat is thick enough, there will be no problem." By reviewing the anti-corrosion process, there are cases where reappearing rust can be significantly improved. 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.
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