Phosphating solution online-monitoring and automatic-supplementing apparatus

Abstract

The invention provides a phosphating solution online-monitoring and automatic-supplementing apparatus. The apparatus comprises a work tank or a circulation tank, a measuring pool, a concentrate pool and pipelines, and the work tank or the circulation tank is connected with a metering pump to the concentrate pool through a pipeline; the work tank or the circulation tank is connected to the measuring pool through a pipeline; the work tank or the circulation tank is connected with a condenser through a pipeline, the condenser is connected with a sampling pump, and the sampling pump is connected to the measuring pool through a float flow meter; and a temperature sensor and a pH probe are arranged in the measuring pool, and the measuring pool is connected to a control portion through a pH meter and a communication line. The online monitoring and automatic supplementing of a phosphating solution are realized through adopting a real-time control technology. The apparatus which allows the fluctuation of technological indexes of the phosphating work tank solution to be controlled in a small range guarantees the product quality stability, increases the labor efficiency and improves the labor environment of workers.

Description

technical field [0001] The invention relates to a phosphating device in the technical field of metal surface pretreatment, in particular to a device for on-line monitoring of the phosphating solution in a workpiece tank with a pH meter, and for automatically replenishing the phosphating concentrated solution by using the detection result. Background technique [0002] Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. The purpose of phosphating is mainly to provide protection for the base metal and prevent the metal from being corroded to a certain extent; it is used as a primer before painting to improve the adhesion and anti-corrosion ability of the paint film layer; Friction, lubrication use. [0003] In phosphating treatment, as the processing capacity increases, the processing capacity of the phosphating working bath will decrease. Wh...

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Problems solved by technology

[0005] However, none of the above methods solves the problem of online detection of phosphating solution and real-time supplementation. In addition, because phosphating solution is prone to slagging at high temperature, it will block the pipeline, and slag will be deposited on the pH probe, which will affect the accuracy and even greatly reduce the pH. Meter service life

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