Automobile coating pretreatment process, need a series of chemicals , such as oil -removing, phosphating/bonderiting, passivation . After phosphating pretreatment , A steady insoluble bonderite membrane can be formed in the surface of metal work piece, strengthen corrosion resistance and adhesion of paint.
Generally the pretreatment process is as following:
Pre-degreasing →degreasing →water rinsing I→pickling →water rinsing II→neutralization →water rinsing III→surface activation →phosphating /bonderiting →water rinsing IV→passivation .
This phosphating process can be changed according to customer’s condition, Our technicians will give you best suggestion plan .
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