Need help about CCA ( copper clad aluminum)?
440471
A di-electric union sold in plumbing stores. Example if you have iron pipe and you want to join to copper. Any good plumber could tell you at the hardware store.
811653
copper or stainless steel fittings will not be harmed, but aluminium can dissolve in sodium hydroxide, although the rate is small though; you wouldnt see a difference unless your entire sink was made of Al alloy and you used drain cleaner every single day.\n\nceramic/porcelain are also safe as they are enameled.
190092
Dissolve salt in vinegar.  To clean copper wipe on with a cloth.  To clean brass, submerge the brass piece in a bath of salt and vinegar.  There is an electric reaction where the ions of sodium from the salt displaces the copper/ brass.  Do not allow to dry on. \n...or to clean copper pans, use ketchup and let set for awhile then rinse off.\n...or soak in Worcestershire sauce.\n...or dip half a lemon in kosher salt and rub well. Then polish with a soft cloth and beeswax for a deep, lasting copper shine.
396821
high velocity copper covered lead
960401
You need to know the coefficient of thermal expansion of the brass. This depends on the exact brass alloy that is being used.\n\nAs an example, for brass alloy UNS C35000, the TCE is 20.3 * 10^-6 / °C.\n\nThe basic formula is DL/L = TCE DT where DL means change in length and DT means change in temperature.\n\nYou must expand the sleeve to a diameter greater than the shaft. That means it must expand by at least .02 cm. In general, for an easy slip fit you would want to have about 30 microns of additional clearance - that is .003 cm.\n\nThe fractional expansion is .02/3.195 = 6.3 E-3 for zero-clearance, or .023/3.195 = 7.2 E-3 for 30 microns clearance. \n\nThat corresponds to a temperature difference of 310°C for the zero-clearance case or 355°C for the clearance case.\n\nThese temperature differences are large enough that the assumption of constant TCE will no longer be valid. In particular, you could not achieve this temperature difference by cooling alone, since the projected temperature would be less than absolute zero. \n\nIn reality the amount of interference specified is about a factor of 5 greater than would normally be used.
122259
wow open question here...what is the end result and use. if it is say for automobiles it would be copper, nickle and chrome for cheep jewerlery sure gold last...many possible answers
887687
Below is a link to a practical for finding the % copper in pennies.  The same method will work using brass in place of pennies.\n\nhttp://www.creative-chemistry.org.uk/alevel/module5/documents/N-ch5-17.pdf
715046
Forget about the mass of the water.  When it was all over, the water had not absorbed or given up any heat, so all of the net exchange happened between the copper and the aluminum.  I am not going to look anything up for you, but you need to know the "specific heat" for each of the metals.  Since they all wound up at the 25C temperature of the water, and the heat gain of the aluminum equaled the heat loss of the copper, find out what quantity of aluminum would absorb the heat given up by 210 g of copper as it changed from 80C to 25C.  Set the problem up like this:\nSpHtCu x 210 g x (80C-25C) = SpHtAl x Mal x (25C-5C) where\nSpHtCu = the specific heat of copper, \nSpHtAl =  the specific heat of aluminum and\nMal = the mass of the aluminum block\nDivide both side of the equation by SpHtAl and by 20C and you will have a number on the left side of the = sign and just Mal on the right side of the = sign.  At that point, you have your answer.
238574
Not all metals stick to each other. So you many need an adhesion (glue) layer. Copper (Cu) will stick to Aluminium (Al), as will Chromium (Cr). Gold (Au) will not stick to Al. But Cr can be used as adhesion layer for Au. The adhesion layer needs to be thick enough to uniformly cover the surface of your Al.\n\nIf you need more nfo let me know,\n\nDwayne
66513
http://en.wikipedia.org/wiki/Copper%28I%29_chloride
628622
Heat sinks are commonly made of a good thermal conductor such as copper or aluminum alloy. Copper is significantly more expensive than aluminum but is also a better thermal conductor. Aluminum has the significant advantage that it can be easily formed by extrusion, thus making complex cross-sections possible. The contact surface of a heat sink must be flat and smooth in order to ensure the best thermal contact with the object to be cooled. Sometimes a thermally conductive grease is employed to ensure the best thermal contact, such greases often contain colloidal silver (an even better thermal conductor than copper.)
709208
You can find international suppliers at the reference.  It appears that many materials are used including plastic and aluminum.
363070
Copper, Iron, Chromium, Aluminium
386803
I can't answer your question with absolute certainty, I apologise, but may have something to point you in the right direction...\nThere used to be a show on HGTV called Modern Masters- there was a metal artist on there once, the cut 1/2 inch wide copper strips, wove them into a 'fabric', carefully folded it and placed it into a kiln (1500? 1600? degrees f), he let it soak in the heat for a while (can't remember how long), then took it out and placed it into a water bath.  I think part of the colouring process might have come from the rapid cooling?  The piece had the colours you were looking for, as I recall.  \nI like the sound of what you're doing...hope it all works out for you...
863889
Copper is used as a conductor and as a easily maliable (formable) metal.  It is also naturally anti-bacterial.
857898
2Al + 3*(CuO) -> Al2O3 + 3*Cu\n\nI2 + 2*(Na2S2O3) -> 2*(NaI) + Na2S4O6\n\nI2 + 5*(Cl2) -> 2*(ICl5)
198802
http://www.ccaha.org/arch_rec/lecture.php?lec_id=price_fabrication