1. Improper Surface Preparation
· Cause: The steel surface was not thoroughly cleaned before painting, leaving behind scale, oil, or other contaminants.
· Effect: These impurities hinder proper adhesion between the primer and the steel surface, reducing coating adhesion and leading to rusting.
2. Insufficient Coating Thickness
· Cause: The applied primer thickness did not meet the required standards during construction.
· Effect: A thin coating fails to provide effective barrier protection, allowing the substrate to be exposed to moisture and oxygen, resulting in rusting.
3. Poor Painting Environment
· Cause: High humidity or unsuitable weather conditions during painting, such as rain, snow, or fog.
· Effect: Excessive moisture absorption before the coating dries compromises the primer's anti-rust properties, leading to rusting.
4. Incorrect Paint Mixing Ratio
· Cause: Improper ratio of curing agent to base component or inadequate mixing during the preparation of two-component epoxy zinc-rich primer.
· Effect: Incorrect mixing affects the chemical properties of the paint, causing incomplete curing and reduced anti-corrosion performance, which results in rusting.
5. Coating Damage
· Cause: Mechanical damage or wear during transportation, installation, or use.
· Effect: Damaged areas expose the substrate to air, causing localized corrosion and rusting.
Conclusion
The rusting of Epoxy Zinc-Rich Primer is primarily caused by factors such as improper surface preparation, insufficient coating thickness, poor painting environment, incorrect paint mixing ratio, and coating damage. To prevent rusting, it is crucial to ensure proper surface treatment, adequate coating thickness, suitable construction conditions, accurate paint mixing, and protection against mechanical damage during application and use.We hope this information helps you better understand the application and maintenance of epoxy zinc-rich primer, ensuring its effective anti-corrosion performance and extending the lifespan of your steel structures.
