Fuel tanks are a prime example. Aluminum corrosion could however be a serious issue. Some of theses, notably and , have better corrosion-resistance properties than others. More generally, 1xxx, 3xxx, 5xxx and 6xxx series alloys offer good corrosion resistance. Anodizing is a kind of surface oxidation that can produce some very attractive finishes.
Leave some aluminum exposed and you risk corrosion getting a toehold. Ideally, keep the aluminum dry. Many boaters also use a sacrificial anode made of zinc.
This corrodes faster than the aluminum, in effect, sacrificing itself. Sacrificial anodes do need replacing periodically, but then so will most coatings. In the movie Tony Stark says he moved on from the original iron suit to one made of a gold-titanium alloy. They suggest a better option would be Nitinol, an alloy of nickel and titanium. You can request Nitinol for your next fabrication project if you want, but it may work out to be a little expensive. Those chemicals mixed together create a noxious gas that can make you sick, or worse.
The harsher the salt, the faster it will work. It may, or may not have the effect you are seeking, though. This is the recipe for tear gas. Post a Comment. Tuesday, January 17, How to Rust Aluminum In plastic container pour an equal amount of Vinegar and Clorox;. I would suggest wearing gloves as these chemicals together can turn your hands black. The aluminum oxide layer protects the pure aluminum inside from the familiar surface corrosion, but there is a much more pernicious type of corrosion which can affect aluminum: pitting corrosion.
Pitting corrosion is a type of galvanic corrosion which happens to metals that are protected by a passive layer, like aluminum and stainless steel.
Pitting corrosion happens in a very small area of the metal which by some means has its passive layer removed. This can happen chemically or simply from a scratch. Once the protective oxides are removed, oxidizers like chlorine and sulfides in the air or water in the surrounding environment begin to attack the underlying metal and corrode it locally.
The rate of pitting corrosion will increase if there are excess oxidizers in the air, as is the case for many developing markets, including certain parts of China. Because this type of corrosion tends to dig into the metal, pitting corrosion is notoriously hard to detect. It also causes serious structural issues which can lead to total failure of the metal.
While in storage and shipping, there are packaging materials which can save aluminum from the perils of pitting for extended periods ; in situe, and in the very long-term, there are no complete solutions. One of man's few techniques for corrosion control, and arguably the most used, is passivation, i. But aluminum by nature exhibits the property of passivation thus eliminating it as a choice for further protection it must be said that adding more or thicker passive layers will add that much more time for the pitting corrosion to reach the material being protected, but the point here is that it is only a matter of time; corrosion is inescapable.
In this way, pitting corrosion, along with its close cousins, proves itself to be one of the most dangerous forces facing a modern society which relies so heavily on natural and artificial passivation for protection of the equipment on which so many lives depend.
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