■ phosphating process and parameters of a spray, spray pre-treatment process parameters selection of materials handling process temperature ℃ min treatment time dosing% skim XH-19 40-60 8-15 5 RT 1-2 100 washing water pickling XH -16C RT 10-15 2-4 RT washed in tap water and industrial water washed sodium RT 1-2 3-5 RT 1-2 100 1-2 100 Table tune XH-12 RT 1-2 0.1-0. 2 phosphide XH-103 RT 5-10 2 water tap RT 1-2 100 1, the composition and nature protection film H2O Fe + 2Zn (H2PO4) ------- ZnFe (PO4) .4H2O + 2H2PO3 [O] which ZnFe (PO4) .4H2O protective film, the composition of phosphate crystals, has the following properties: ◆ chemically very stable, with no electrical conductivity, and thus be able to lasting stability; ◆ coating for fine crystal, moderately rough metal surface, should adsorption plastic layer to improve adhesion; ◆ has a certain self-lubricating, it is appropriate to further plastic processing; 2, spray spray technology and equipment is one of the key processes produce shelves, generally using automatic assembly line, a defensive spray curing is complete, so spray quality is guaranteed, as compared with conventional oven, has the following advantages: Consistent ◆ heating time, temperature stability, thus ensuring consistent color; ◆ dusting heating once completed, to reduce intermediate links Pollution and bump;