I'm so glad i live south of the rust On Dec 12, 2007 2:00 AM, Tom Hargrave <[EMAIL PROTECTED]> wrote:
> The problem with steel is that a sheet will have areas with positive and > negative ions. Add a conductive solution, like salt water, and you have > instant galvanic corrosion (a shorted battery). This is what causes steel > car bodies to rust. No other metal or metal alloy has this trait. > > When you pare a less noble metal with another, it's the less noble metal > that corrodes. This is why a zinc anode reduces corrosion on a steel boat > hull. But a steel boat hull is one continuous form and the exposed parts > of > hull & the anode are in the same solution (both are in the water). > > In other words, for the anode to work it has to be in the same solution as > the steel - it has to complete the circuit (the shorted battery). To be > effective, you would need attach one anode to the inside of every body > panel. If not and salt water washed into the driver door panel & the anode > was attached to the inside of the trunk, the anode would do no good. > > The zinc plating in modern car bodies does is effectively an anode > everywhere. The zinc plating slowly oxidizes, protecting the steel as it > goes away. > > By the way, a sacrificial anode will work, as Range Rover discovered with > their aluminum bodies a number of years ago. The aluminum bodies literally > rotted away & the design cost them huge sums of money in warranty work. > > Both stainless steel and high carbon steel can be protected by an oxide > layer but either can rust under the right conditions. > > Stainless with a minimum of 13% chromium is protected by a thin layer of > chromium oxide. But break the protective layer and don't allow it to > re-form > and active corrosion can set in. > > Given time, high carbon steel will develop a natural brown oxide layer. > Once > this layer forms, the high carbon steel also becomes somewhat corrosion > resistant, but not near as resistant as some stainless steels. Weapons > manufactures in the 1800's used to artificially create this layer through > a > process they called browning and they used stale urine in part of the > process! You can see the finish on a lot of old rifles and handguns. The > finish was replaced later by bluing because bluing is easier to apply. > > Thanks, > Tom Hargrave > www.kegkits.com > 256-656-1924 > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Craig McCluskey > Sent: Tuesday, December 11, 2007 9:44 PM > To: Mercedes Discussion List > Subject: [MBZ] Rustproofing [was: Re: Chrysler Lifetime Warranty] > > On Tue, 11 Dec 2007 16:39:45 -0500 Peter T. Arnold <[EMAIL PROTECTED]> > wrote: > > > I wish Marshall would chime in with Elementary Chemistry and tell you > > fellows that there is NOTHING YOU CAN DO to stop steel from returning > > to it's elements as red oxide. > > Stainless steel is much slower, probably thousands of year but, it > > will get there. > > Do can slow down carbon steel. Galvanized was used on Ford Falcons of > > the 60's. Every notice that they didn't rust for a long time? They > > stopped because they had difficulty with paint quality. > > If you don't want it to rust, just keep all oxygen away from it. > > There used to be kits to add a sacrifical anode to your car and a power > supply to power it, but I haven't seen them recently. > > Do they still exist, or were they ineffective and discontinued? > > Thanks, > > > Craig > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
