Insufficient surface treatment was the culprit behind the recurrence of rust, a warning of decreased adhesion.
Has rust reappeared after painting? The cause may not be the paint, but rather a decrease in adhesion due to insufficient surface treatment.
Surface treatment is a crucial process that affects the adhesion of the paint film and its corrosion resistance. However, in practice, there are many cases where it is judged that "there is no problem because cleaning is done before painting." In reality, insufficient degreasing or inadequate chemical treatment can lead to reduced adhesion of the paint film, allowing moisture and oxygen to infiltrate through tiny gaps, which can cause corrosion to progress within the paint film. This is particularly true for iron materials and zinc-coated materials, where insufficient surface treatment can easily lead to re-rusting. This is actually a point that is often overlooked. Poor adhesion may not be visible immediately after painting. Furthermore, in chemical treatment, there are cases where management is based on a liquid temperature of 35 to 50 degrees Celsius and a film weight of about 1 to 3 grams per square meter. Insufficient treatment can lead to peeling or pinholes. A common misconception on site is the belief that "rust prevention can be achieved solely through paint performance." By reviewing surface treatment conditions, there are many cases where re-rusting can be 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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