what are the enviromentalproblems of corosion? Is corrosion always bad? Is corrosion worth prevening?
612801
Corrosion is the oxidation of a metal.  Oxidized metals do not possess valuable or useful properties.  That is, they are typically more brittle and less conductive.\n\nCorrosion occurs naturally and it is bad when it results in inefficiency or failure of the metal.
630453
Corrosive liquids such as aldehydes, amides etc.
348589
As the above answerer states, you don't need to - titanium won't rust; rather it develops a protective, inert oxide layer in air, just like aluminum has it's protective  inert oxide layer - Al2O3.\nIron and steel rust/oxidize in air and it can prevented by giving a coating of zinc, chromium, or magnesium on it.
797998
Aluminum will oxidize, but the aluminum oxide forms a coating over the remaining aluminum that prevents further corrosion.\n\nBy contrast, iron oxide (better known as rust) will not form such a coating, it will warp and crumble and expose more iron to rust.
110331
Corrosion is the result of metal oxidizing. When metal comes in touch with air, the water vapor and oxygen content of the atmosphere react with the metal to cause rusting/corrosion. \n\nIf you were to cover the metal with a non-water based paint, like in automobiles, this process is then reduced, in fact it is stopped for sometime -till the time the paint and its base coats remain intact.
934030
less so than non-anodized ( people have been cooking with aluminum cookware since the 1880's and there have been a few studies that suggest harmful effects in the last 20 years - and a ton of them that said no harm ) since the surface is harder you are less likely to ingest any part of the utensil and there has been nothing to suggest the anodizing process is harmful\n\nthe safest thing to do would be to switch to cast iron ( beneficial ) , stainless steel or ceramic coated ( non reactive )\n\nand yes all of the non-stick coatings are suspect ( anodizing is more of a dye than a coating )
203284
Very bad things. The water will not burn, so the engine will run very rough (if at all), water can also confuse the oxygen sensor and cause the computer to give you a check engine light until it clears up, and water sitting in your fuel system can also start to rust & corrode things from the inside out. The worst-case scenario is that enouth water finds its way into the cylinder head, fills the combustion chamber, and causes a condition known as hydro-lock. Since water can't be compressed, it can cause catastophic engine damage since pistons, connecting rods and cylinder heads will usually fail first under that kind of pressure.\nGood luck,\nSteve
531919
errrrrrr Oxygen, hence rusting is stricly called oxidisation.  But perhaps you should inform your questioner that Water is actually made up of Hydrogen and Oxygen, therefore some of the answers are obsolete.\n\nThink about the fact that metalwork inside a waterproofed building goes rusty as well as that outside.
143304
Salt water is more corrosive, if that's what you're looking for.
43302
Rust is the substance formed when iron compounds corrode in the presence of oxygen and water. It is a mixture of iron oxides and hydroxides. Rusting is a common term for corrosion, and usually corrosion of steel.\n\nIron is found naturally in the ore hematite as iron oxide, and metallic iron tends to return to a similar state when exposed to air, (hydrogen, oxygen, nitrogen, etc) and water. This corrosion is due to the oxidation reaction when iron metal returns to an energetically favourable state. Energy is given off when rust forms. The process of rusting can be summarized as three basic stages: The formation of iron(II) ions from the metal; the formation of hydroxide ions; and their reaction together, with the addition of oxygen, to create rust.\n\nIron is the main component of steel and the corrosion of steel is observed more frequently, since iron is rarely used without alloying in the present day.\n\nWhen steel contacts water, an electrochemical process starts. On the surface of the metal, iron is oxidized to iron(II):\n\n    Fe → Fe2+ + 2e-\n\nThe electrons released travel to the edges of the water droplet, where there is plenty of dissolved oxygen. They reduce the oxygen and water to hydroxide ions:\n\n    4e- + O2 + 2H2O → 4OH-\n\nThe hydroxide ions react with the iron(II) ions and more dissolved oxygen to form iron oxide. The hydration is variable, however in its most general form:\n\n    Fe2+ + 2OH- → Fe(OH)2\n    4Fe(OH)2 + O2 → 2(Fe2O3.xH2O) + 2H2O\n\nHence, rust is hydrated iron(III) oxide. Corrosion tends to progress faster in seawater than fresh water due to higher concentration of sodium chloride ions, making the solution more conductive. Rusting is also accelerated in the presence of acids, but inhibited by alkalis. Rust can often be removed through electrolysis, however the base metal object can not be restored through this method.\n\nHydrated iron oxide is permeable to air and water, meaning that the metal continues to corrode after rust has formed. The iron mass eventually converts entirely to rust, and disintegrates.
1155855
Possibly the material underneath the stainless is corroding and the rust found a way through. It's not necessarily solid stainless steel.
753805
Pure water......no!  Rusting is a very LONG process; however, if salt is present it acts to speed up the reaction.  Even if the nail is placed in salt water, it will not rust until exposed to oxygen.
607583
erosion,corrosion and abrasion
723118
YOUR DEALING WITH SALT WATER SO A DERIVITIVE WOULD BE ANTI AGRESSION TO THIS  SOME CONCRETE COMPANIES MAY HAVE THIS TRUE ANSWER\nANTI CORROSIVE PROTECTANT \nSEE IN FLORIDA WE USED A ALUMINUM BASED METAL BUT CHECK WITH THE CONCRETE MANUFACTURES IN YOUR AREA
123171
You guys are all close.\nGalvanise is a noncorosive protectant put on metals to protect from rust and carosion.\n\nSteel is a composit make up of different metals (one of which is iron) and carbin to acheave it's spacific purpose of malabulity (able to bond or weld) and strength and flexabulity (usually for structures like buildings).\n\nIron is not widley used in pure form because it is brittle.  You will usually only find iron in castings wich are case hardened for toughness like in engine blocks wher flexabulity is a bad thing.
1027806
When shipping anything metal that has the potential to experience a salt water environment, coat the object in a substance called Cosmoline, which is a waxlike substance that prevents oxidation and corrosion.  It can be found at any Hardware store or Gun shop.
110798
Corrosion is caused by oxidation. By painting the metal, you add a barrier to protect the metal from direct exposure to the air, which contains oxygen.