Why did the metal objects in the Titanic corrode very slowly?
540350
Oxygen levels lower at depth of ship wreck causeing a slower oxidation rate .
410825
Others have had similar problems and solved them.  See the link.  In general, metals (especially iron and its alloys) rust when exposed to moisture in the presence of oxygen.  The rust is a loose collection of molecules that allow more moisture and oxygen to reach the base metal.  For example, you can shine aluminum but it will quickly dull with oxidation.  The aluminum corrosion however forms a tenacious film that protect the metal from additional corrosion.  I heard that copper (flashing?) on a rooftop can cause aluminum gutters to corode.  Various alloys of iron (steel) including heat treatments may impart various corrosion properties, however, chrome is usually added to form stainless steels that best resists rusting.  Silicon steel may have to be protected.  Good luck.
250184
While the corroded part of the copper shield will have altered conductivity, there still is a metal surface - the border to the patina - where metal conductivity occurs. There might be a slight increase in resistivity, but not significant compared to contact corrosion.
1155855
Possibly the material underneath the stainless is corroding and the rust found a way through. It's not necessarily solid stainless steel.
778296
Salt can affect rate of corrosion  even if there is no water present.  This is due to the following reasons:\n\nNaCl dissolves into Na+ and Cl- ions in the presence of water.   These ions act as conductors of electricity  and make the water more conductive.  This increases the rate of corrosion.\n\nCl- ion is a strong reducing agent.   Therefore, it attacks the iron (III) oxide layer already formed and exposes a new layer of iron.  This also speeds up the rate of reaction.\n\nFinally, even if there is no water, NaCl itself has the property of hydroscopicity.  That means that it has the ability to absorb water even from the atmosphere.   \n\nAll these factors sum up to make salt a major contributor to corrosion.
254607
A metal's corrosion (rusting) rate depends on its chemical properties. Some metals just take longer than others to corrode. Keep in mind that most metals have very high melting temperature, so in general high temperature doesn't contribute to the corrosion of a piece of metal just sitting in a damp space. For temperature to be of concern, it has to be around 700 degrees Celsius.\n\nI don't know much about your experiment, but you might not be using an appropriate metal sample. Most commonly found metals come with coatings or contain chemical inhibitors to prevent corrosion. Think about bikes sitting in outside in a humid (moisture-rich) environment. Manufacturers have to coat the metals to prevent this corrosion, or else no one would buy their product. This is the case with most metals. So if you just picked up something laying around the house and tried to corrode it, your experiment might not be successful. You should also be aware that only ferrous (iron) alloys rust, and the particular metal you tested might be something else.\n\nGo to google and type "rusting metal" (without the "s). The first four sites have lots of info.\n\n*It wouldn't rust in the freezer because there's no moisture in the freezer.
150659
You may be referring to a sacrificial anode?\n\nSometimes, in order to prevent something from rusting (like a metal water pipe or the hull of a ship), you sacrifice a more reactive metal to corrode first.\nFor example, if you wanted to protect an Iron water pipe from rusting, you could electrically conect it to a "sacrifical" piece of Magnesium (a more reactive metal)m this way, the Mg will corrose first, keeping the Iron safe.\n\nEdit:\nYou wouldnt mix the sacrifical metal in with the metal your trying to protect, then you'll just get an object with a bunch of holes in it (where the other metal was eaten away).  You would electrically connect the sacrifical electrode to the other metal with a wire or something of that sort, then as the sacrificial electrode is corroded away, the other metal stays perfectly intact.\nI think in real life Magnesium is a very common metal to use since it is so high up in the reactivity series and not insanely expensive. Silver doesnt corrose very much at all, it wouldnt work as a sacrifical electrode, not would it need one very badly.
863380
On structures made of steel which are in constant contact with sea water (ships, oil rigs and piers) the most effective protection used is from 'sacrificial protection'. Blocks of magnesium are bolted to the structure at regular intervals and the sea water attacks the magnesium in preference to the steel. (This is because magnesium is much more reactive than iron) It is a quick method and cost effective if you imagine the labour (an amount of paint) needed to protect a large ship.
995698
On the bottom of the Atlantic ocean, 1700 feet under the surface, archaeologists found the wreck of the old side-wheel steamship, "Republic."  She sank in a great hurricane in October, 1865, off the coast of Georgia (US - the country of Georgia is landlocked).\n\nNewspaper reports after the ship's loss said that she went down with $400,000 of gold coin, destined for New Orleans.  And one newspaper story suggesed she also carried a separate cargo of $70,000 in coin for someone else in New Orleans.\n\nUsing robotic equipment, the archaeologists excavated the SS Republic.  They found the remnants of two wooden barrels holding gold and silver coins, 59,000 in all.  So far, they have not found the rest of the money said to have been aboard th ship.\n\nThe wreck of the SS Republic presents MANY historical mysteries.  One of the myseries is, who were the people who escaped from her that stormy day?  Some are known and their stories have been found, but most remain just names in newspaper lists of shipwreck survivors.  Another is who were the people who died after the ship sank?  Newspaper accounts suggest one or two people drowned while swimming away from the sinking ship to lifeboats, and either 14 or 16 people died while castaways on a raft that was not found until a week after the sinking.  All of these people today are forgotten, nameless victims; who were they?\n\nOf course, the archaeologists would VERY much like to know where the rest of the money can be found on the wreck.\n\nAnd finally there is THIS mystery:\n\nAt least one and maybe more of the canvas bags of coins in the barrels came from the Bank of New York.  The archaeologists found the lead seals used by the bank to close the bags.  Those bags of coins were silver half-dollars, ALL made in the New Orleans mint in 1861 - some before Louisiana seceded from the Union, some made while Louisiana was an independent state, and others made when the Confederacy ruled.  So the coins in these bags were under Confederate control after they were minted.  Most of the money in New Orleans was dispersed into the Deep South when the Union assaulted, and captured, the city in April of 1862. \n\nHOW DID THEY GET TO NEW YORK DURING THE CIVIL WAR?\n\nHow did these bags of 1861 "O" silver half-dollars end up in a New York bank vault, and then come to be put on the doomed vessel to be shipped back to New Orleans only months after the war had ended?
315092
Water and impurities in the water cause friction.
66714
Extremely unlikely. A lot of time has passed, and within that time, the structure has shifted, pieces of it have collapsed and sunken, and the metal is slowly being eaten away.\n\nSurely any attempt to raise the infrastructure from the surface is going to make it collapse and break apart in numerous ways. The Titanic's remains has been erroding away steadily over the years, and eventually there won't even be much left of it.
123326
Most corrosion is on the outside so it really doesn't make a difference, hot or cold. What determines corrosion is the \nenvironment outside of the pipe.
672632
i don't know exactly how it works but rust is caused by oxidisation, which is a reaction between oxygen and the metal. i'm not sure why, but water speeds up the process, allowing the oxygen in. but water does not cause rust. oxygen does.
714735
Here are two:\n\nIt rusts and it is magnetic.\n\nAlso since it is a nail, i would say it is long and narrow.
59443
technology was responsible,\nat the time the "TITANIC" was fitted out with the best technology of the times.And with that in mind you know how people like to boast, well what was said is between the dimensions, and the best available technology, it would be impossible for this ship to sink.and you know the rest...
447024
It is chemical change. The material ( generally metal) gets oxidised when left in air and this is termed as rust.
224956
For any kind of electrochemistry to occur, there should be electrolytes present in the fluid to transfer charges.  This is why salt water is more corrosive.