Stainless steel's passive film hinders adhesion. Here are three checkpoints for pre-treatment to prevent peeling.
The stainless steel coating peels off immediately. If changing the paint doesn't stop it, the cause is in the pre-treatment. ────────────── ■ Cause of Occurrence The surface of stainless steel has a passive film known as an oxide layer, which has properties that make it difficult for general chemical treatments to be effective. This leads to poor adhesion and is the main cause of peeling. ■ The Truth If you paint without removing the film, an anchor effect does not occur between the coating and the material, and adhesion cannot be secured. Residual oil due to insufficient degreasing also worsens peeling. ■ Improvement Measures Create surface roughness through blasting treatment to enhance the anchor effect. Using a primer specifically for stainless steel is also effective. Please utilize materials that can confirm the pre-treatment conditions.
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Material compatibility: Stainless steel (SUS304/316, etc.) / Pre-treatment: Blast + dedicated primer compatible
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Applications/Examples of results
Exterior painting of stainless steel products such as automotive parts, construction hardware, and kitchen equipment.
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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.
