Notes on heat treatment or insulated aluminium coils

Not all of the surface insulation aluminum coil after machining, without surface machining for casting process of forming a thick oxide layer, some also with sand, this should be the first to use the method of blasting machine or remove the parts of the original film , or by alkali washing after processing only.  

So We in addition to the original oxide layer just unprocessed parts, but also can avoid the machining position tolerance and size change. Harbin Dong Xing Aluminum Co., Ltd is a competent and reliable Aluminum PE coated coil manufacturer China .

Accor thing to the requirement of process, heat treatment or thermal insulation aluminum coil into the welding process before the organic solvent cleaning, in addition to the net surface oil, but gene rally can not do this, the heat insulating aluminum coil is formed on The surface of a layer of oil coking sintering, this layer of coke in organic solvents is difficult to remove, if soak in lye can cause local corrosion, pitting or have caused odd, seriously affect the quality of products.  

With concentrated nitric acid soaking to soak this layer of coke, CO king material to be soft after in alkaline cleaning can be completely cleaned.