The surface is intact, yet only the corners of the cut surface are rusting. I will explain the key points of edge rust prevention based on the relationship between burrs and film thickness.
The surface is clean, yet only the cut corners start to rust. Even though it's not a case of forgetting to paint, why does it begin at the corners? ────────────── ■ Cause of Occurrence Paint does not adhere to sharp edges with remaining burrs. The paint film escapes from the corners due to surface tension, resulting in a film thickness of about one-third of that on the flat surface. ■ The Truth When the film thickness at the corners falls below 10 microns, corrosion resistance is almost completely lost. Slag from laser cutting and burrs from pressing retain moisture even after drying. Since the film thickness gauge can only measure flat surfaces, this deficiency goes unnoticed during inspection. ■ Improvement Measures Ensure that the chamfer is at least 0.3mm and fix the burr removal process before pre-treatment. Use edge primers or powder coating to cover the corners. Please utilize the materials summarizing the methods for measuring edge film thickness.
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Corresponding materials: Iron, stainless steel, aluminum / Pre-treatment: Degreasing, deburring, zinc phosphate coating / Chamfering standard: 0.3mm or more / Flat film thickness: 20-40 microns / Edge film thickness: 10 microns or more
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Rust prevention coating for outdoor use parts such as sheet metal press parts, laser-cut products, building materials, exterior components, and playground equipment. We have a track record of establishing chamfering standards as a countermeasure against rust complaints from cut surfaces.
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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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