Cleaning and Phosphocromatation
process and advantages of cleaning and phosphocromatation
Chemical removal of grease spots and of superficial organic components.
Can be performed as a chemical cleaning (standard) or chemical and electrolytic cleaning (special).
Depending on the nature of the substrates, the aqueous chemical solutions contain different kind of basic compounds.
It is applied on the aluminium to prevent against the corrosive agents and as a film-substrate of further varnish-layers.
It is called also phosphocromatation where the protective film contains only chrome (III). Therefore it is often preferred to replace the old hexavalent chrome cromatation with regards to the UE Environmental Norms (such as rohs, reach and so on).
Good corrosion resistance (salt fog cabinet test= 72 hours for
common castings with regards to norm UNI ISO 9227/2006), good adherence as pre-varnishing layer and preservation of electic and magnetic properties of the items’ sostrate. It is a conversion of the surface because of the reaction by the aluminium sostrate and the solution salts.
Suitable on all kind of aluminium alloys. In particular, to odds and ends or items up to 3 metres of lenght. Furthermore it is possible to define then apply new specific jigs in order to treat diffent kind of geometries and shapes.
The coating process depends on the shape of the item, on the edges and weldings and the superficial activation. In certain cases it is necessary to process further the matherial by a prior sandblasting step.
Find out how much you can save up