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Sorry Mister Stark, but iron is a lousy choice for a suit. Aluminum does corrode though, especially if exposed to seawater. Most metals want to corrode back to some form of ore. Gold is one notable exception. Corrosion starts with oxidation, where atoms of metal link up with oxygen, followed by a gradual, or not so gradual, breakdown. Rusting is a specialized form of corrosion that only iron and steel go through.
Rust is when the iron oxidizes and flakes off. Flaking exposes fresh metal beneath, which in turn oxidizes and flakes. Aluminum oxidation happens faster than that of steel, because aluminum has a really strong affinity for oxygen. Rather than flaking though, aluminum oxide just forms a hard, whitish-colored surface skin. When all the aluminum atoms have bonded with oxygen the oxidation process stops.
Scratching this oxide skin exposes bare metal, and the process begins again. Chlorides are compounds Aluminum Boat Trailer Corrosion Fund of chlorine. Sodium chloride would be an example, which is the chemical name for salt. And where do you find lots of salt? In the ocean. Likewise, sulfides are sulfur compounds. Second, if conditions are right you could experience galvanic corrosion.
For example, immerse brass and aluminum in seawater and electrons move from the aluminum to the brass. This can be a problem in boats where brass fittings are close to or even in contact with aluminum. 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.
Maybe he should find a plating service that can help him protect his metal components. Your email address will not be published. Rust vs Corrosion Most metals want to corrode back to some form of ore. Aluminum Corrosion Scratching this oxide skin exposes bare metal, and the process begins again. Minimize or mitigate the effect of galvanic corrosion. Preventing Galvanic Corrosion Ideally, keep the aluminum dry.
Building a Better Iron Man Suit In the movie Tony Stark says he moved on from the original iron suit to one made of a gold-titanium alloy. Toby Ryan on June 25, at am. Submit a Comment Cancel reply Your email address will not be published.
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