White rust from zinc plating is the cause of pinholes. Management of storage conditions and surface treatment is essential.
Pinholes that occur in galvanized materials can sometimes be caused by gas generation due to surface reactions. Particularly when white rust is present, reactions can progress during baking, leading to gas formation inside the paint film. The zinc surface is prone to reacting with moisture, so materials that have been stored for a long time require extra caution. Additionally, insufficient zinc phosphate treatment can lead to reduced adhesion and the expansion of pinholes. As a countermeasure, it is important to combine light polishing with chemical treatment. Especially in environments with humidity over 60%, the progression of white rust accelerates, making proper storage management necessary. Detailed examples of improvements are also provided in publicly available materials.
Inquire About This Product
Related Videos
basic information
Pinhole countermeasures and improvement methods
Price range
Delivery Time
Applications/Examples of results
Improvement of coating quality
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.
