Device for controlling Fe < 2 + > concentration in phosphating solution

Abstract

The invention discloses a device for controlling Fe < 2 + > concentration of a phosphating solution. The device comprises an oxidation reaction device, a phosphating tank body, an overflow pipe and awater pumping device, and the oxidation reaction device is used for removing Fe < 2 + > in the oxidized phosphating solution. The oxidized phosphating solution flows into the phosphating tank body through the overflow pipe, and the phosphating solution containing Fe < 2 + > in the phosphating tank body flows into the oxidation reaction device through the water pumping device; the phosphating solution containing Fe < 2 + > in the phosphating tank body is introduced into the oxidation reaction device to complete the reaction, so that the continuous production of the phosphating process is not influenced; and phosphated residues generated in the removal process are also remained in the oxidation reaction device, so that the quality problem caused by the phosphated residues is avoided.

Description

technical field [0001] The invention relates to the field of surface treatment of fasteners, in particular to a chemical solution control Fe 2+ Concentration device. Background technique [0002] Phosphating is one of the main surface treatment methods for high-strength fasteners in engines. Its main function is to stabilize the friction coefficient of parts, generate stable axial force during assembly to prevent bolts from loosening, and provide certain anti-corrosion capabilities for bolts. Its main production process is degreasing and degreasing-water washing-pickling and rust removal-water washing-surface adjustment-phosphating-water washing-drying-oil immersion. [0003] In the phosphating process, the parts are immersed in the phosphating solution, and a phosphating reaction occurs with the phosphating solution, forming a layer of phosphating film on the surface of the workpiece. The main control parameters of the concentration of phosphating solution are total acid,...

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Problems solved by technology

The main problem of this method is that during the oxidation process, the chemical reaction is violent, and the phosphating solution produces a large amount of FePO4 residues attached to the workpiece, and the whole treatment process needs 2-4 hours to stand still for precipitation; while the existing fastener surface treatment is generally continuous automation Production equipment, resulting in the non-continuous production of the phosphating process, resulting in waste of production efficiency; at the same time, a large amount of phosphating slag is deposited on the bottom of the phosphating tank, which will cause phosphating slag to float and deposit on the workpiece

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