Why Zinc Coating Quality Fails in EMT Conduit and How to Prevent It
Why Zinc Coating Quality Fails in EMT Conduit and How to Prevent It
Introduction
Zinc coating is essential for protecting EMT conduit against corrosion. However, many importers experience coating-related issues after shipment, even when products initially appear acceptable.
This article explains why zinc coating quality fails in EMT conduit and what buyers can do to prevent these problems.
Common Zinc Coating Failures
Typical zinc coating issues include:
Peeling or flaking after bending
Uneven coating thickness
Exposed steel at welded seams
These problems often become evident only during installation or after storage.
Root Causes of Zinc Coating Failure
1. Poor Surface Preparation
If the steel surface is not properly cleaned before galvanizing, zinc adhesion will be weak.
2. Inconsistent Galvanizing Parameters
Unstable temperature or immersion time can result in uneven coating.
3. Rushed Production Cycles
High-speed production without sufficient process control increases defect rates.
Why Zinc Coating Problems Are Expensive
Reduced corrosion resistance
Increased customer complaints
Replacement and re-shipment costs
Damage to distributor reputation
In export markets, these costs often exceed the initial price savings from low-cost suppliers.
How Buyers Can Reduce Zinc Coating Risk
To minimize risk, buyers should:
Confirm the galvanizing method used
Request coating thickness ranges, not just averages
Ask whether adhesion or bending tests are performed
Inspect coating condition after sample bending
Preventive checks before shipment are far more cost-effective than post-delivery claims.
Conclusion
Zinc coating quality failures in EMT conduit are rarely accidental. They are usually the result of weak process control and insufficient inspection.
By understanding the causes and implementing proper supplier evaluation, buyers can ensure long-term corrosion protection and stable product performance.
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Written by ALEX conduit production team