Normal-temperature four-in-one phosphating solution special for cathode electrophoresis pretreatment
A cathodic electrophoresis and phosphating solution technology, which is applied in the direction of electrophoretic plating, electrolytic paint, coating, etc., can solve the problems of easy anti-rust, incomplete rust removal, and inability to wash with water, so as to strengthen the function of oil and fat removal and prevent Washing to restore rust and improve film quality
Pending Publication Date: 2022-03-01
天津市顺超有限公司
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Problems solved by technology
Ordinary four-in-one cannot be washed with water, it is easy to rust, and the rust cannot be completely removed, and the film layer is thin and cannot be continuously sprayed and washed
Method used
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Embodiment 1
[0012] Embodiment 1: the usage comparison table of traditional phosphating solution and the application phosphating solution is as follows:
[0013]
[0014] When in use, the present invention is diluted with tap water at a ratio of 1:10 to prepare a working solution. During use, there is no need to add supplementary liquid, only 1 / 10 of the concentrated liquid should be replenished according to the consumption of the working liquid, and the water pump will automatically replenish without the need for staff.
[0015] The present invention simplifies the electrophoresis pretreatment process of negative waste as follows: water washing-special four-in-one phosphating at room temperature-water washing-pure water washing-electrophoresis. Through the combination of accelerators, the reaction speed at room temperature is strengthened, so that the four-in-one function can be completed after soaking for 5min-10min and spraying for 3min-5min. The present invention can reduce labor c...
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The invention discloses a normal-temperature four-in-one phosphating solution special for cathode electrophoresis pretreatment. The normal-temperature four-in-one phosphating solution comprises, by mass concentration, 300 g / L to 525 g / L of phosphoric acid, 0.5 g / L to 10 g / L of sodium dihydrogen phosphate, 8 g / L to 50 g / L of nitric acid, 2 g / L to 15 g / L of manganous nitrate, 0.02 g / L to 0.2 g / L of copper nitrate, 0.5 g / L to 5 g / L of sodium molybdate, 0.1 g / L to 1.5 g / L of sodium m-nitrobenzenesulfonate, 0.5 g / L to 2.5 g / L of citric acid, 0.1 g / L to 1.5 g / L of dispersing agents, 0.1 g / L to 1.5 g / L of penetrating agents, 0.1 g / L to 1.5 g / L of surfactants, 0.5 g / L to 2 g / L of The rust removal function of the phosphating solution is enhanced, rust and oxide skin of a workpiece can be completely removed, washing re-rusting is prevented by converting a compact and fine phosphating film, the oil and grease removal function is enhanced by compounding a surfactant, the metal surface passivation function is completed through an oxidizing agent, and the film layer quality is improved.
Description
technical field [0001] The invention relates to the field of chemical derusting, in particular to a normal-temperature four-in-one phosphating solution specially used for cathodic electrophoresis pretreatment. Background technique [0002] At present, the general process flow for cathodic electrophoresis pretreatment of steel materials: water washing-pre-grease-heating degreasing-water washing-pickling rust removal-water washing-pure water washing-heating phosphating-water washing-pure water washing-electrophoresis. The technological process is long, the energy consumption is large, and the water resource consumption is large. The traditional phosphating solution contains chromium, nickel, and nitrite, which is not environmentally friendly. Ordinary four-in-one cannot be washed with water, it is easy to rust, and the rust cannot be completely removed, and the film layer is thin and cannot be continuously sprayed and washed. Contents of the invention [0003] In view of t...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C25D13/20C23C22/42C23G1/08
CPCC25D13/20C23C22/42C23G1/088
Inventor 王超
Owner 天津市顺超有限公司