Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Rod Speed" Newsgroups: aus.electronics,aus.cars Subject: Re: DIY Electronic Vehicle Rust Prevention Date: Mon, 26 Feb 2024 05:42:28 +1100 Lines: 90 Message-ID: References: <65dab557@news.ausics.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit X-Trace: individual.net HMTI26L4eHO5JvIugGv9GQITw+Cikkhue4V51mZiK3DddkO3k= Cancel-Lock: sha1:j8mvSkatfWx1Z+De5y+eBFqlTWM= sha256:6N1WTztsJx6fMJwV/93QWoKjCPHNOsSFqtQC/VETm/A= User-Agent: Opera Mail/1.0 (Win32) Xref: csiph.com aus.electronics:35721 aus.cars:364125 Computer Nerd Kev wrote > While looking into rust-proof paints, I stumbled uponthe world of > electronic rust prevention gadgets: > https://www.erps.com.au/how-electronic-rust-protection-works/ > https://endrust.com.au/products-services/Electronic-Rust-Protection/ > https://nilrust.com.au/product-details/electronic-rustproofing/ > etc. > Much like with the paints, the question is whether it works, or > whether it's just snake oil. Rust preventing paint certainly does work. I built my house in the very early 70s and the entire structure is RHS, and did the two big gates out of RHS too. Used killrust paint and nothing has rusted in what is now more than 50 years. And my 2006 Hyundai Getz has not rust at all, not even the decent gouge that some arsehole managed to do in the woolys car park right in the middle of the driver's door, with what appears to have been the corner of a ute flat tray. And I have done nothing to protect the gouge at all. > It's supposed to use conductive pads > to create a static charge on the steel vehicle body by using the > paint as a dilectric layer forming a capacitor. The charge prevents > oxidation of the metal. Can't see that and my formal qualifications are in chemistry. > In this discussion it's mentioned that by relying on the paint to > form the dilectric, it won't work in areas where the paint is weak, > which is where rust would start anyway: > https://www.electro-tech-online.com/threads/electronic-rust-protection-for-cars.13859/ What is the detail of the car ? Modern cars are much better than the old ones. > Then again much of my trouble is from cavities in old vehicle > bodies rusting out from inside*. Yeah, I did manage to do that myself with my previous 73 VW Golf. I knew that the windsceen leaked and the car always lived outside. Eventually that did rust thru the floor that way. > The paint on the outside is OK > until the rust eats right through, Yep, that's what happened with the Golf. > so would the electric charge preventthat rust starting on the inner > side? Can't see it myself, particularly with the door frames where rust usually happens due to blocked water drain holes in the older fords and holdens and pom cars. > This also says "There are to date no official reports which show > that cars with electronic rust proofing have less corrosion than > they would without the device": > https://www.autotrainingcentre.com/blog/truth-electronic-rust-protection/ > On that basis I certainly wouldn't buy one at the prices these > systems are advertised at, but it seems they should be temptingly > easy to make, and maybe try out in some experiments. > I can't find any DIY designs online, but the specifications on this > page suggests that the electronics just make a 50V peak-to-peak AC > voltage at 12.5KHz which is applied to the adheasive contact pads > (copper tape?): > https://endrust.com.au/product/2-pad-cat-electronic-rust-protection-system/ > Input Voltage > 12V/24VDC > Operating Voltage > 9V-32VDC > Output Transformers > Two (2) > Output Power (to each Pad) > 50Vpk-pk @ 12.5kHz > Ground > Negative > Current Draw > 25ma +/- > If that's all there is to it, then it shouldn't be hard to build my > own equivalent. > Anyone know of existing DIY projects or authoritative proof that it > doesn't (or does!) work? > * Waxy cavity coatings like this were actually what I was > investigating when I stumbled onto these gizmos: > http://www.septone.com.au/product/l/rustproof-4l