Why is it desirableto paint hot water pipe with aluminium paint?
825802
Because aluminium is a conductor of heat ,unlike normal paint which are insulators and would therefore contain the heat.
909393
B.\n\nthe process is called passivation. and may be increased to a greater extent on purpose by electrolysing aluminum in acid to increase the oxide layer. this is called anodizing.
232646
Fire is oxidation of a material at a fast rate. The aluminum foil you put in the stove getx a coat of aluminum oxide on it and then goes no further as a gas oven is not hot enough to "burn" aluminum. Aluminum can be burned if one gets the temperature hot enough. This is called the thermite reaction and happens when finely divided aluminum, such as shavings is mixed with iron oxide (rust) and the mixture set afire with a fuse perhaps made from thin strips of magnesium metal. The iron oxide or rust becomes iron metal again and the aluminum becomes aluminum oxide or alumina. The heat is intense enough to melt iron.Such reactions are used in industry to perform welding. It is all quite dangerous and a person not familiar with the laws of chemistry may become blinded by the light of the reactions involved or harmed by server burns. Do not try this at home.
889387
I'll give this a shot!  Typically, any metal expands in size when heated.  The Safari company that builds motorhomes in Oregon used overhead heat lamps to heat up to 40 foot long aluminium panels prior to installation on the outside walls of their motorhomes.  Once heated, the panels were riveted in place on the sides of the motorhome.  Once it cooled down to ambient temperature, the panels become very taut due the contraction. It was a quite good manufacturing method they used for years.
967084
I would use a length of nichrome wire (see links below) stretched between a couple copper blocks. You could make some sort of pinch block out of the copper and connect a power supply to the copper. (or drill a hole through it with a set screw, tap a hole and us a pan head screw)  You will have to insulate the copper from the rest of the world so you don't short something out.  G-10 (a glass/epoxy resin) makes a good moderately high temperature insulator.  One of the contacts should be fixed and the other allowed to "float" and allow for changes in the length of the wire due to heating.  A spring could be used to provide tension or an air cylinder.  The power supply will depend on the length and diameter wire you choose.  If there is a problem with the electrical contacts heating up, you could run some cooling water through them.  Just drill a hole through it and 1/8 NPT pipe tape both ends.  You can plumb some water to it and it will keep the copper chilled.
169774
I use a torch with MAPP guess whenever I solder copper pipes.  For welding iron, I use a MIG or arc welder.
79160
A painting medium manufactured by Winsor & Newton. It is excellent used with oils or alkyds. It speeds up the drying of oils, makes them more brushable and gives gloss. Also adds transparency. Very good for glazing. It also resists yellowing.\nwww.kidzpicz.com/Artist%20Manual/dictionaryofartisticterms.htm
515776
usually metals are used to color the compounds. Look at glass blowing webites its similar in the construction. There are also salts that can be used.
135604
Are you talking about the wire to supply the resistance heating wire or the resistance wire its self?\n\nThis is not something you should undertake in any way shape or form. It is something for a trained professional who has the experience and knowledge to install such a system safely.
125784
Painting seals the surface, protecting it from corrosive elements.
1061168
Really this question should be in home and garden.  He should use an oil based paint.  water based will likely peal off.
157251
if it is a stainless steel kettle, use anything that does not scratch the metal, so dont use like a brillo pad or something.
1094317
aluminium because its an alkali earh metal and\nfluorine is a halogen
48024
Your question doesn't make sense.  No metal would produce heat by being put in hot water--heat is only produced by a chemical change.  Perhaps sodium metal, which would conbust if the water had any oxygen in it, but it wouldn't need to even be hot water.  Also, water wouldn't be water at 400 degrees.
1049421
The problem with that is that water wil freeze below 32 farenheit. so it would need a eletric trace(heat trace to heat it up if temp goes below 32) and insulation to keep the heat in. Also, rusting is a major issue which is bound to happen even if the most rustfree material is used. Also leaks are a major issue. Something chemical has to be mixed with water to determine exact location of the leak if one takes place. the oil pipelines in middle east use a chemical, i forget the name, for the same reason. Adding and removing the compund from water may be a major pain. Also another major problem would be collecting the water, how exactly would that be done. Drainage water maybe, but it would be very very hard to collect pure rainfall and transport it. The idea may seem easy but it would involve major reconfiguration of water systems, water collectors, pipelines within existing eastern cities, etc to provide water to the west. Its just not economical to do so. Also pumping stations to clean water at each interval are also expensive to first build and then run.
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.
210952
Are you speaking of a Heat Pipe and its conversion?\n\n\nCheck out the following links: