Why do blisters appear months later? The reason for invisible corrosion.
Parts that had no issues at the time of shipment are now blistering in the market. We will uncover the mystery of blisters that occur after a long period of time.
[Cause of Occurrence] "Blisters," which appear as water blisters on the paint film of automotive suspension parts and other components months after delivery, are defects that are extremely difficult to address with complaints. They have the troublesome characteristic of being hard to detect during pre-shipment inspections in the factory. [Truth] The true nature of blisters is "invisible corrosion" that progresses beneath the paint film. If salt and impurities remain on the metal surface due to insufficient rinsing in the pretreatment process, moisture from the atmosphere can penetrate and absorb water through osmotic pressure, pushing the paint film up from the inside. This can also manifest as a precursor to other abnormalities, such as color unevenness. [Improvement Measures] The use of pure water (conductivity of 10 microsiemens/cm or less) in the final rinsing process and thorough drying after rinsing are the solutions. A checklist that establishes quality standards for the rinsing process can be downloaded from this link to assist in quality assurance. [Summary] Blisters that occur with a time lag can only be prevented by thorough removal of impurities in the final rinsing of the pretreatment process. Eiwa Kogei Co., Ltd. provides consistent support from pretreatment to painting, ensuring high quality assurance.
basic information
Corresponding materials: Iron, general die-cast / Coating thickness: 8-10 microns / Drying conditions: 80 degrees, 3 minutes / Salt spray test: 1000 hours (JIS Z 2371) / Zero blister management
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Applications/Examples of results
Automotive parts, suspension parts, industrial machinery
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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.