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Silver nitrate testing on steel coils

October 2026Gemlik5 photos

We use the silver nitrate (AgNO₃) test on site to identify the source of rust, wetness and water staining on steel coils. When the solution is sprayed on the suspect area, a white, milky precipitate (silver chloride) forms if chlorides are present, showing that the wetting came from seawater. If there is no reaction, the moisture most likely came from fresh water, such as rain or condensation (sweat).

This distinction matters because it directly affects liability: seawater contact points to hatch cover tightness or the sea passage, while freshwater wetting is usually linked to storage, weather or hold ventilation. Testing before loading, together with photographic records, supports the remarks entered on mate's receipts and bills of lading and protects all parties in any later insurance or P&I claim.

Silver nitrate test applied to rust spots on the outer wrap of a coil. The result shows whether the wetting came from seawater or fresh water.
Testing widespread rust staining on the coil edge face. Corrosion moving in from the edge may indicate water between the wraps and helps determine the extent of damage.
Checking rust marks concentrated along the wrap edge. Findings are photographed and recorded against the coil number, documenting the condition before loading.
Testing a wet mark on the wrapping paper and coil surface. Wet packing means corrosion can continue underneath it; early detection prevents the damage from growing.
Investigating the source of moisture on a stained coil surface and around a rusted steel band. Band areas are where water collects most and receive particular attention.