Why does rust reoccur? The fear of "invisible moisture" lurking inside metals.
Even after removing rust and repainting, it rusts again after a few months. The mechanism of rust recurrence that troubles the site and how to break the cycle.
[Cause of Occurrence] There are many cases where, despite sanding off rusted areas on automotive undercarriage parts and repainting, rust reappears in the same spots within a short period, leading to serious reclaims. [Truth] Even if the surface red rust is removed, black rust, moisture, and salt remain in the fine pores of the metal in an "invisible state." When paint is applied over this, the oxygen and moisture trapped inside continue to react, breaking through the paint film (such as blisters) and causing rust to reappear. [Improvement Measures] Complete rust removal requires either physical stripping using blast treatment or chemical neutralization with a dedicated rust converter. You can download the process documentation for a robust anti-rust painting to help prevent recurrence from here. [Summary] Rust recurrence cannot be prevented by surface treatment alone. It is essential to completely remove and neutralize the corrosion factors lurking deep within. Eiwa Kogei Co., Ltd. possesses reliable technology to prevent recurrence, from fundamental rust removal to anti-rust painting.
basic information
Corresponding materials: Iron, automotive underbody parts / Chemical treatment film thickness: 8-10 microns / Rust prevention management: Phosphate treatment / Salt spray test: 1500 hours / Rust-free guarantee: 5 years
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Applications/Examples of results
Automotive undercarriage parts, construction hardware, metal products.
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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.