Zinc coating inspection methods for steel fencing
Zinc coating inspection methods for steel fencing Zinc coating inspection methods for steel fencing determine whether your perimeter investment lasts 10 years or 50. A fence that looks identical at installation can fail decades early if the zinc layer is too thin, uneven, or poorly adhered. Buyers often rely on a mill certificate and call it done. That is a mistake. This guide walks through the practical inspection methods — from simple field checks to laboratory testing — so you can verify coating weight, uniformity, and adhesion before accepting a shipment. It is written for procurement managers, contractors, and engineers who specify fencing for industrial, military, or infrastructure projects. Key Takeaways Measure zinc coating weight using the magnetic gauge method or the gravimetric (weigh-weigh-weigh) method per ISO 1461. Perform the Preece test to confirm coating uniformity and freedom from bare spots. Use the bend test and hammer test to verify adhesion — a thick coatin...