What are the main problems that affect annealing of aluminium and aluminium alloys?
Stefan says: The big problems here are the formation of excessive aluminium oxide (Al2O3), excessive magnesium oxide (MgO) and staining from rolling lubricants. The main problems associated with annealing of aluminium foil are staining, colouration and carbonaceous deposition. Q: And how do I avoid them? Stefan says: The use of a 100% nitrogn atmosphere, using 99.999% pure N2, will prevent the formation of excessive Al2O3 and MgO. It is also important to ensure an optimum nitrogen flow rate during heating up and to ensure that the circulation fan is working both during purging and during the entire annealing cycle. Q: Where can I get more information about non-ferrous annealing? Stefan says: Over the years BOC’s process specialist have collected a wide range of information related to annealing atmospheres — and most of this is freely available to registered CATweb (http://catweb.boc.com) users. Registration is quick and easy — and it’s free. And once registered, the CATweb is your oy
