Warning of "thermal expansion difference" in dissimilar metal pinholes.
Dissimilar metals cause pinhole formation due to differences in expansion. The adoption of low-temperature curing paint is a countermeasure.
In products that combine different metals, pinholes may occur due to differences in thermal expansion. During curing, the amount of expansion varies by material, leading to stress within the coating. Particularly in combinations with a large difference in expansion coefficients, such as aluminum and iron, there can be cases of fine coating failure. Effective countermeasures include using low-temperature curing paints and designing highly flexible coatings. It is also important to consider these factors from the structural design stage. Detailed examples of improvements are also provided in publicly available materials.
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