What is paint failure that swells a few months later? The importance of moisture management to prevent blisters.
The swelling of the paint film that is not visible at the time of shipment may be caused by moisture residue after pretreatment.
■Cause of Occurrence: Blisters are defects where the paint film swells like a balloon. Even if the product is good at the time of shipment, it may be discovered by the customer weeks or months later. The main causes are moisture retention after pretreatment, oil or rust on the surface of the material, and insufficient drying. Invisible residues foster defects beneath the paint film. ■Truth: No one notices the moment it occurs. Even if it passes visual inspection, if moisture or corrosion factors remain beneath the paint film, it will push the film up from the inside. This is a warning sign of adhesion failure, rust reoccurrence, and paint peeling. The risk for the entire lot is hidden behind a single blister. ■Improvement Measures: Check the drying time before painting, the overlap of parts, and any holes or edges where water may remain, as well as welds. Confirm during the process that no moisture remains on the parts, and also record cleaning, storage time, film thickness, and curing conditions. Please utilize materials that allow you to verify moisture retention, pretreatment, and drying conditions.
basic information
Cause 3 elements: Residual moisture after pretreatment, oil and rust, insufficient drying / Key confirmation points: Holes, edges, welds, overlapping parts / Drying: Confirmation of residual moisture at component temperature / Salt spray test for 1000 hours (JIS Z 2371)
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Applications/Examples of results
Automotive parts, suspension parts, welded structural parts, long-term storage parts.
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