The pinholes in stainless steel coating are caused by insufficient degreasing and drying. I will explain the key points for reviewing the pretreatment process.
Are there frequent pinholes in your stainless steel coating? Before giving up and blaming the material, please review your pre-treatment process. ────────────── ■ Causes of Occurrence Pinhole defects are tiny holes that form in the coating. The main causes are residual oil due to insufficient degreasing and moisture vaporization due to inadequate drying. Stainless steel is a material with a smooth surface that tends to retain oil. ■ The Truth If the temperature of the degreasing solution is low, oil cannot be sufficiently removed. If rinsing after chemical treatment is insufficient, moisture remains in the coating, which vaporizes during curing and causes pinholes. ■ Improvement Measures Maintain the temperature of the degreasing solution above 50 degrees to increase the oil removal rate. Ensure adequate rinsing and drying time after chemical treatment. Please utilize materials that allow you to review pre-treatment and drying conditions.
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Material: Stainless Steel (SUS304/316, etc.) / Film Thickness Management: 8-15 microns / Support from small lots to mass production.
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General stainless steel products such as food machinery parts, kitchen equipment, medical device parts, and construction hardware.
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.
