![]() ![]() Zinc plating is rarely sufficient for exposed outdoor use, especially in a marine environment. It prevents rust and corrosion far longer than paint will, often for 50 years or more, but eventually that brown rot will set in. Galvanization is a zinc coating applied over the top of steel. … Galvanized steel is by far the most affordable on this list, which is why it remains so widely used outdoors. The zinc becomes the sacrificial anode and will corrode before the steel underneath, even if some of the steel is exposed (a phenomenon called preferential corrosion). The zinc particles are smelted in a furnace. The hot-dip method lives up to its namesake by involving heated, molten zinc. The main difference is that zinc-plated steel is created using an electrical current, whereas galvanized steel is typically created using the hot-dip method. What is the difference between zinc plated and galvanised? Its advantages are its brightness and uniform color making it more aesthetically appealing. It is a thinner coating than hot- dip galvanizing making it unsuitable for outdoor applications. Zinc plating or electroplating is a process where zinc is applied by using a current of electricity. Is zinc or galvanized better for outdoor use? ![]() … After 20 years outdoors a galvanized product will not show signs of rust. Hot dip galvanizing might be 1.0 mil thick – you get over 5 times the protection with galvanizing. The big difference is thickness: zinc plating is normally 0.2 mils thick. Few things survive enough winters to die of corrosion.Ī lot of my aquaculture gear comes from Australia (none from New Zealand, sorry Peter), some pretty creative minds in the oyster business there.Both zinc plating and galvanizing is an application of zinc plating. Instead we make it out of hot-rolled, and make new stuff when the old stuff gets crushed. Absent that we'd make everything out of 316 stainless or marine-grade aluminum. We pull the oysters out of the ocean and put them into cold storage to keep them from getting crushed, but no one has the capacity to pull all their metal structures out as well. Hereabouts the bays and harbors freeze about 5 years out of ten, ice can get a few feet thick (2003 it was sixteen feet thick) and scours the farms with every tide for a few weeks. The reason we go for quick fixes here is that our weather usually destroys metal before corrosion can. Also agree with the lack of toughness of the cold galvy, the truck bed liner paint is the better-than-nothing patch. ![]() Peter S, yeah I know, sometimes in a jam I just go to the big box store and buy what's on the shelf to get the job done. I thought the brush-on product would be more durable than the spraycan variety, it typically is better in regular paint. It appears to me that this particular (Australian made) zinc rich paint is as durable as the original hot dip galvanising.įranco, agree completely a washdown after saltwater use makes a huge diference in longevity. There was no sign of rusting or electrolytic action at the interface between the extension and the original trailer frame. To satisfy my curiosity I unbolted the extension from the trailer recently to check the contact area between the extension and the original galvanising on the trailer. Neither the weld at the back of the trailer nor the drawbar extension is showing any sign of rusting. Since then it has not been subjected to use in salt water, but is still in limited use for another purpose. The trailer was used frequently for about ten years in a salt water environment and washed down with fresh water after each use. About 20 years ago I made a boat trailer drawbar extension from hot rolled steel, and painted it with a couple of heavy coats of a brush-on cold galvanising paint also painted a weld on a clamp nut on the back of the trailer, which was submerged each time the boat was launched or retrieved. ![]()
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