Do zinc plated bolts rust8/25/2023 ![]() In my situation, there will be far more aluminum angle/housing than screws, and I've read that it's good to pick the more voluminous material to be the sacrificial piece. I've been (through links posted on this site) about galvanic corrosion between aluminum and stainless or zinc. I'm trying to decide on screw material and it pretty much comes down to stainless or zinc plated machine screws due to general availability. In order to ensure that the batteries don't jump out of the frames while I'm driving, I was going to tap the frame and housings and use M6 machine screws to hold the battery/housings in place. There are nine batteries that weigh about 18 lbs each, and they are enclosed in aluminum housings. I am building (welding) 6061 aluminum angle (1" x 1" x 1/8") into trays that the batteries will sit in. I am converting a motorcycle from gas to electric. Thank you for your reply and advice, it's much appreciated. But those little screws are not the cause of broad swaths of oxidation that's just a normal thing that happens to aluminum over time). You can't use stainless screws in critical aerospace applications for example. (Note to purists: this is not to say that there are no galvanic issues between stainless steel and aluminum. Further, zinc plated screws won't last and will soon rust as they have in the past.Īfter you are done with whatever screw replacement you are going to do, the bare aluminum can be buffed to remove the oxidation and restore the shine, and a clearcoat like Everbrite can be sprayed or brushed over both the bare and painted areas. The stainless screws are fine, and are used all the time in similar situations, and not the cause of the oxidation. The rusting screws will continue to rust, so it would be best to replace them. We love the caravan and its family history so are keen to keep it going as long as possible.Ī. There are still quite a few rusty steel screws in place which would need to drill out and many stainless steel screws which seem ok.ĭo I need to remove all the screws and replace them? If so what with? I am keen to rub the caravan down and repaint it but want to address the oxidising issues first as best as I can. There are no water leaks I can find and all the timber framework is dry as seen when windows and vents have been replaced. The oxidising isn't particularly around the screw areas but spread out over the panels. Over the years my father replaced a good percentage of rusting steel screws with stainless steel ones and whilst the screws are still okay the aluminium isn't. I've noticed that there are getting more signs of oxidising on the aluminium skin and I'm wondering if its the screws causing this? It's always been barn stored when not in use. We use it a lot and it's in great condition. I have a 1977 painted aluminium clad caravan that was my late father's. What screw material for aluminum caravan?
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