A general phosphating agent
A technology of phosphating agent and accelerator, applied in the direction of metal material coating process, etc., can solve the problems of poor versatility, difficult treatment of production wastewater, large environmental pollution, etc., and achieves the effects of easy control, fine crystallization, and reduced energy consumption.
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[0024] The embodiment of a kind of general phosphating agent described in the present invention, comprises following composition: zinc oxide, nickel nitrate, manganese carbonate, phosphoric acid, nitric acid, fluosilicic acid, additive, and water.
[0025] The principle of phosphating film formation is as follows:
[0026] Macha (Zeng Hualiang, Yang Jiachang "Electrolysis and Chemical Conversion Film", Light Industry Press, 1983, P205-206) believes that phosphating is a typical local reaction, which is an electrochemical reaction in nature.
[0027] (1) Iron is corroded and dissolved by phosphoric acid on the anode of the microbattery: Fe→Fe 2+ +2e;
[0028] (2) Hydrogen discharge on the cathode: 2H + +2e→H 2 ↑;
[0029] (3) Due to the H at the metal-solution interface + Descending, the reaction proceeds to the right:
[0030] 2Me II (H 2 PO 4 ) → Me 3 II (PO 4 ) 2 ↓+4H 3 PO 4 .
[0031] Generated Zn 2 Fe(PO 4 ) 2 4H 2 O is deposited in the cathode area, an...
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