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How do you remove oxide layer from steel after vacuum heat treatment?
Wiki User
∙ 12y ago
It is important to heat treat in vacuum as otherwise lots of oxides form; after heat treat in vacuum oxides are removed, if part small enough, by use of an abrasive grit pad, such as Scothbrite A, and cleaned with acetone followed by isopropyl alcohol. If not protected, however, oxides will continue to form in air
Wiki User
∙ 12y ago
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What is a capacitor made of?
A basic capacitor is made up of two conductors separated by an insulator, or dielectric. The dielectric can be made of paper, plastic, mica, ceramic, glass, a vacuum or nearly any other nonconductive material. Some capacitors are called electrolytics, meaning that their dielectric is made up of a thin layer of oxide formed on a aluminum or tantalum foil conductor.
What causes the oxide scale on metal during heat treatment or annealing?
chemical reaction between the oygen atoms and the carbon atoms
What is the difference between stainless steel and normal steel?
stainless steel has chromium added to the steel, which forms a protective oxide layer at the surface, preventing corrosion (rust).
What about tarnishing of silver is chemical or physical change?
It's a chemical change. A thin layer of silver on the surface reacts with oxygen in the air - to form silver oxide.
Why polar capacitors can store charge in one way only?
The reason that some capacitors are polarized has to do with their physical construction. A common type of polarized capacitor is the aluminum electrolytic capacitor. These capacitors use aluminum coated with a thin layer of aluminum oxide for one plate and a conductive solution as the other plate. This strategy yields very high capacitance in a small physical volume because the aluminum oxide dielectric layer can be made extremely thin. Unfortunately, this construction only allows bias in one direction (the aluminum with the aluminum oxide coating must be the anode) because reversing the bias causes the dielectric to break down. I believe that the chemical reaction that takes place is this: when the aluminum plate coated with aluminum oxide is given a negative charge, the Al+3 ions in the aluminum oxide are reduced back to aluminum metal (taking electrons from the plate). This liberates the oxygen from the aluminum oxide as a gas, which is why reverse-polarizing these capacitors produces out-gassing (and bursting of the physical package of the capacitor if there is no relief valve). Tantalum electrolytic capacitors have a conceptually similar design. The anode is a tantalum wire with an oxide layer as a dielectric. Subjecting these capacitors to reverse bias also breaks down the dielectric by reducing the tantalum ion back to tantalum metal.
Why is the magnesium strip polished before weighing?
To remove the oxide layer (magnesium oxide) on it
Can magnesium create oxygen?
Magnesium does oxidize. That is why magnesium is often found on earth with a thin layer of Magnesium Oxide (MgO). For this reason when using magnesium in experiments you must always sand it to remove the oxide layer.
Why do metals have to be sandpapered?
The reason why metal have to be clean with sandpaper is to remove the oxide layer on the surface of the metal. This is because most metal have a high tendency toward oxygen. The metal will react with oxygen in the air and form an oxide layer on the surface of the metal.
What is pilling bedworth rule?
According to Pilling-Bedworth rule, if the volume of oxide layer formed is greater than the volume of the metal, the oxide layer is protective and non-porous. However if the oxide layer formed has volume lesser than that of the underlying metal then the oxide layer is porous and non-protective.
What are the differences in the properties between the silicon substrate and the oxide layer?
Silicon Substrate Silicon substrates are mainly used for power semiconductors in automotive, electronics and HF front-end pa. silicon that can be fused with other materials, such as thermal oxide and or silicon nitrite. Oxide Layer An oxide layer is a thin layer or coating of an oxide, such as iron oxide. Such a coating may be protective, decorative or functional. It is a passivizing layer on the surface of the metal, preventing further corrosion.
What happens when magnesium ribbon is burnt in air?
Magnesium is an extremely reactive metal. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air.
How can a layer of aluminum oxide be made thicker and what is the process called?
The layer can 't thickned further because Al2O3 aluminium oxide or in other words corrosion. IT is the tendency of aluminium that the layer of aluminium oxide(white in colour) or corrosion prevents the metal from further corrosion.So only one layer of aluminium oxide can be on the meatal it cant be thickned.
How does iron oxide harm the environment?
Because the oxide hits the ozone layer and I think that is why
Is bluing permanent?
Bluing, as it relates to firearms or metal in general, is a permanent surface treatment under ideal conditions. Poorly maintained bluing will fade or flake off. Bluing is a "form of rust", an oxide layer on the outside of the metal. You can remove it using various abrasives, but yes it is permanent.
Why does aluminium corrode faster in water?
Aluminium does corrode, but after this does not corrode at all because aluminum is a reactive metal. Normally, aluminum is protected by a thin layer of oxide making it inert (unreactive). However, you can remove the layer of aluminum oxide by submerging the aluminum metal in mercury(II) chloride. Upon treatment, aluminum is stripped of its oxide quickly and becomes covered by a thin layer of an amalgam (a substance formed by the reaction of mercury with another metal). Once amalgamated, aluminum can undergo a variety of reactions. (eg: it will dissolve in water, which can be dangerous, as hydrogen gas and heat are generated).
What chemical attacks the ozone layer?
CFCs, nitrous oxide.
What are the dangers in the ozone layer of the stratosphere?
Freons + Nitric Oxide are a danger to the ozone layer in the stratosphere.
