Why Metal Gates Rust at the Welds and Hinges

A faint orange stain running down from a hinge pin after a foggy morning is usually the first sign, and it is never random. Work booked through metal gates carlsbad goldies la tends to start with those stains, because on a metal gate in Carlsbad, CA rust picks the same few spots every time. The marine layer settles on every surface, but it lingers where water cannot drain.

Welds trap moisture and strip the finish

A weld is a rough bead of cooled metal sitting on top of a smooth tube. Paint covers a rough bead thinly, and the heat of welding burns off protective coating nearby. Unless the bead is ground smooth and the area is re-coated or galvanized, salt collects in the tiny crevices and corrosion begins along the edge of the joint.

Hinge pins and the gap around them

A hinge is two moving surfaces separated by a thin film of grease, and that film washes out in a season or two near the coast. Once the grease is gone, salt water sits in the barrel, the pin seizes, and rust swells inside the knuckle. A self closing hinge on a pool gate suffers most, because its spring is steel and its housing holds water.

Hollow tube ends and open picket tops

A picket cut from square tubing is a tiny cup if the top is left open. Rain and fog drip in, and without a hole at the bottom to let water out, it sits. Rust then grows from the inside, and the first visible sign is a swollen seam or a bubble in the paint at the base of the picket. Capped tops and a drain hole at the bottom prevent most of it.

Post bases and the soil line

The bottom few inches of a gate post live in wet ground or wet concrete. Where the post meets the footing, a ring of damp soil or stucco keeps the steel wet for days after a rain. Posts near the lagoons or low spots toward Batiquitos Lagoon corrode here first, often while the rest of the gate still looks fine.

Latches, strike plates and bolts

Hardware is often plated steel bolted onto a coated frame. The bolt heads chip, the plating wears, and two different metals touching in wet air corrode faster than either alone. Stainless fasteners and a drop rod made of stainless or galvanized steel last much longer near the water.

What to watch for

Orange streaks, paint that bubbles under a thumbnail, a stiff hinge and a latch that stops lining up are all early. Caught at that point, the fix is cleaning and recoating. Left until the metal flakes, it becomes a weld repair.