What causes the difference in color between iron and aluminum? How to match the material differences.
Even though I painted with the same color number, the appearance differs depending on the material. I will explain how to match the colors of the combined parts.
Even though I painted with the same color number, the color looks different on iron and aluminum. The paint is the same; the difference lies in the substrate. ────────────── ■Cause of Occurrence The pre-treatment and the color of the substrate differ for each material. When the reflection of the substrate changes, the appearance changes even if the topcoat is the same. ■Truth Aluminum has a thin conversion coating, making the substrate appear brighter. Iron has a zinc phosphate coating that gives it a grayish tint, making the same paint look darker. Lighter colors and semi-gloss finishes tend to show more difference, which is noticed after assembly. ■Improvement Measures For parts made of mixed materials, unify the color of the primer to eliminate differences. Manage the film thickness for each material to ensure the hiding power of the topcoat. Eiwa Kogei can paint mixed parts of iron and aluminum under the same conditions.
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basic information
Corresponding materials: iron, stainless steel, aluminum, aluminum die casting / Pre-treatment: degreasing, pickling, surface finishing, zinc phosphate coating by material / Color matching: uniform primer, thickness management by material / Film thickness: 20-40 microns
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Applications/Examples of results
Assembly parts with a mix of iron and aluminum, composite units of sheet metal and die-cast, color matching for fixtures and frames and covers of industrial machinery. We support bulk painting on the same line.
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Company information
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.
