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What is the white powder that forms on the surface of aluminum when it corrodes?
Wiki User
∙ 12y ago
Aluminum oxide - Al2O3.
Wiki User
∙ 12y ago
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What is the difference between solid modelling and surface modelling?
The short easy answer is that with solid modeling, forms are built-up by drawing outlines and protruding them into forms, as well as using other protruded outlines to cut forms. Often these shapes are more geometric overall, and solid modeling is usually used to create the internal details of products. SolidWorks is a solid modeler (but can create surface forms too)Surface modeling develops shapes by stretching a "surface" between 3d curves that you individually create. With it you build forms by creating one small surface at a time, slowly creating the complete shape. The intersections between the surfaces are very controlled so they can be very very smooth or crisp like a crease. Usually the shapes are more freeform and sleeker than an object that was created with solid modeling, but some people are very good and the lines blurrr.. Alias is a surface modeler, but Solidworks can create shapes with surfaces tooolids modeler: Starts with a solid object. You add and subtract other solid objects to it. If you cut into it, you're left with your solid object minus what was cut out--just like in the real-world. It's all very rational.Many solids modelers are "parametric" meaning you can go back and look at the list of commands you've executed since the start of your model (the "construction tree") and change anything (hoping your model doesn't "break.") Very useful!Pro/E and Solidworks are the most popular.Surface modeler: A bunch of infinitely-thin membranes defined by boundary curves. If you want, you can connect one membrane to another, creating a "water-tight" form that looks solid, but if you cut into it, it would be hollow and you'd have to patch the missing cutout piece (intersect tools are typically used to automate this.)Surface modelers generally aren't parametric. There is no construction tree. It's very hard to change something you did and expect the rest of your model to update.Why would you use a surface modeler then? Because it's more freeform, and historically, the tools have allowed you more control over the shapes of those "membranes" than if you were using a solids modeler. And because designers have been attracted to this, the user-interfaces tend to emphasize the freeform more than the solids-modelers, which cater to engineers.Alias and Rhino are the most popular.there are some other differences like parametric history and assemblies as well that make Solidworks a worthwhile software to complement your Alias skills...
Which are the three forms of modulation?
There are actually 4 forms. The first and most common is AM, the next is SSB or Single Side band, the third is FM (Frequency Modulation) and the fourth is Digital
What are the three forms of IPv4 communication?
Unicast, Multicast and Broadcast
What is the full form of csat?
csat forms customer satisfaction
What are the four database object?
Tables, Forms, Queries and Reports.
Why does magnesium corrodes faster than iron?
Believe it or not, aluminum is technically more reactive than iron. However, when aluminum is exposed to air, it almost instantly forms a microscopic layer of aluminum oxide (Al2O3) which protects the rest of the aluminum from any further reaction. Iron doesn't do this, and therefore corrodes unevenly, making it unsuitable for certain applications.
Which would corrode first copper or iron?
Aluminum (US spelling) is actually much more reactive than iron, and would corrode faster. In fact, it corrodes so fast that in forms a coating of aluminum oxide on any surface in contact with air. But since the surface is covered, it protects the rest of the metal, and it never corrodes deeper than a fraction of a millimeter. So technically, aluminum corrodes much faster, but much less completely because most of the mass of it is protected by the corroded layer.
Why iron corrodes but aluminum does not?
Both iron and aluminum will oxidize. When iron oxidizes the product (rust) easily crumbles away, exposing more iron to oxidation. Aluminum is even more reactive than iron, but the aluminum oxide that forms is one of the hardest known substances and forms a protective layer that, even though it is microscopic, shields the aluminum from corrosion.
What substance formed when silver corrodes-chemical name?
The substance that forms when silver corrodes is silver oxide (Ag2O). This is a compound consisting of two silver atoms bonded to one oxygen atom.
What is the difference between extruded aluminum and powder coated aluminum and anodized aluminum?
Extruded aluminum is aluminum that is melted down and extruded, pushed through a certain 2d shaped hole. This can result in square tube, rectangular tube, an L shaped extrude, and an infinite array of other shapes. Powder coated aluminum is aluminum that could be extruded aluminum, that is cleaned, coated with a colored plastic powder, and then baked so that the plastic powder melts and forms a smooth, nice and even coat of colored plastic over the part. This is basically painting the part. Anodized aluminum is aluminum, again this could be extruded aluminum, but it couldn't be powder coated aluminum, that is put in a chemical solution, possibly sulfuric acid, and then a current is run through the aluminum. This causes a reaction to occur where a layer of aluminum oxide gathers on the surface of the part. The processes is then stop and the part can be colored if desired. Anodozing aluminum gives the part better corrosive resistance and makes the surface tougher and harder than it would have been if it had not been anodized. It does add thickness to the part which can be a downside, but it also is lighter than a powder coat if a paint job is desired.
Why does aluminum seem unreactive even though its high in the reactivity series?
an oxide layer is formed which prevents the aluminum from further reactions dump some some lye in a aluminum pan and its not so inactive.. (very carefully!) or look at a semi trailer where the steel frame has touched the aluminum sides, result corrosion. It depends on where it is..
Why does aluminium not corrode in the presence of air?
Aluminum very rapidly forms a thin layer of aluminum oxide, which is very stable. The layer "passivates" the surface, and it is immune to all but very strong acids or (especially) bases.
Does aluminum or copper produce more electricity?
Copper is more electrically conductive than aluminum (this is because aluminum forms a monomolecular layer of non-conductive aluminum oxide on its surface).
Why are some metals reactive?
A reactive metal - say Aluminum, can be veiwed as corrosion resistant - but is actually not. What happens is that pure aluminum actually corrodes extremely quickly. A thin film of aluminum oxide forms on the surface - and it is that film that is extremely adherent but also very corrosion resistant. Rust on the other hand does not stick (adherent) to iron/steel. It spalls off allowing the iron underneath to corrode further.
How does acid rain affect roads and other forms of transportation?
It corrodes it
Is aluminum heavier when corroded?
No, aluminum is not heavier when it is corroded. Corrosion is a chemical reaction that occurs on the surface of metals, including aluminum, when exposed to moisture and oxygen. It forms a layer of aluminum oxide, which is actually lighter than aluminum itself.
How does aluminum oxidize?
very easily just being in contact with oxygen, aluminum will form a molecular bond oxidizing. However, the micro-scopic alumina will protect the aluminum from oxidizing further.
