Salt-corroded hinges and how to stop replacing them every year

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Why zinc plating fails on the Kent coast

Zinc-plated steel hardware - the standard hinge, coach bolt or gate latch you find in every builders' merchant catalogue - is rated for standard atmospheric conditions across most of the UK. On the Ramsgate coast it's not. The reason is chloride ion penetration. Sea-air spray carries chloride ions inland. On a zinc-plated fitting, those ions concentrate at the coach-screw seat and at any scratch in the plating, and drive galvanic corrosion of the steel underneath. On the inland UK it's a fifteen-year problem. Within a mile of the Ramsgate seafront it's an eighteen-month problem.

The replacement cycle nobody warns you about

The way it plays out for most Ramsgate owners is this. The house was built or refurbished with zinc-plated hardware because that's what the joiner or fencer had in the van. Eighteen months later the gate hinge starts squeaking. Three months after that it starts binding. Six months after that the coach screws are visibly corroded at the head and the hinge plate has orange rust bleed down the timber below it. Somewhere between years two and three the hinge fails structurally - it doesn't snap, it just loses enough of its screw seat that the gate drops. That's the classic Ramsgate 'gate's dropped again' callout.

What to fit instead

Two options work on this coast. First is hot-dip galvanised steel - the hardware is dipped in molten zinc so the coating is bonded through and doesn't chip off at the screw seat. Hot-dip galv hinges are heavier and slightly rougher-finished than zinc-plated, and they cost about three times as much - so a hinge that was £2.50 is now £7. On a gate with two hinges that's an extra nine quid, and it lasts fifteen years instead of two. Second is A2 or A4 stainless steel. Stainless A2 is what we default to for anything within half a mile of the seafront. A4 (marine grade) is what we use for anything actually facing the sea - the gate at the seafront-facing property, the hinges on the outside cellar door on the East Cliff. Stainless costs about five times zinc-plated. It also outlasts the timber it's screwed into.

The full cost picture

Fitting stainless A2 on a domestic gate adds £15 to £30 to the material cost of a new gate build. Fitting hot-dip galv adds £5 to £15. Fitting the wrong hardware costs £120 to £180 every eighteen months to two years when the gate needs re-hanging. Same maths applies to fence-panel coach bolts, gate drop-bolts, gate latches, external door handles on cellar doors, downpipe brackets and gutter fixings. Every one of them should be stainless or hot-dip on this coast.

If it's already zinc-plated

If your existing gate has zinc-plated hinges that are still functional, you don't need to swap them today. Watch for the first orange bleed at the coach-screw head, and swap the hinge on that visit rather than waiting for the drop. It's a fifteen-minute job. If we're already there for something else we'll do it as part of the visit.