Stirring-type passivation device

Abstract

A stirring-type passivation device is used for workpiece passivation in pretreatment of an electrostatic spraying line. The device comprises a passivation groove; a clapboard is disposed at the bottom of the passivation groove; a plurality of through holes are disposed on the clapboard; the passivation groove is divided into upper space and lower space by the clapboard; an air feed pipe is disposed at the bottom space between the clapboard and the passivation groove; the air feed pipe is connected with an air blower; a plurality of air vents are disposed on the air feed pipe. A concentration controller is also disposed on the passivation groove. A discharge pipe is disposed at the bottom of the passivation groove. The effect is that: through air stirring in the passivation groove, a passivating solution flows in the groove, and thus concentrations of various parts of the groove become uniform; additionally, no precipitation or crystallization is caused through air stirring, and the flowing of the passivating solution can increase the passivation speed; therefore, a washing effect is achieved, and various parts of the workpiece are fully passivated.

Description

[0001] technical field [0002] The invention relates to the field of electrostatic spraying, and is applied to the passivation of workpieces by pretreatment of electrostatic spraying pipelines. Background technique [0003] At present, there is no stirring device for the solution in the passivation tank, so the distribution of chromium ions in the passivation tank is uneven, and precipitate crystals will appear at the bottom of the tank, resulting in uneven passivation of the workpiece, uneven passivation film thickness, and even passivation cannot be formed in some places. Film, crystalline impurities adhere to the dead corners of the workpiece and are not easy to clean, resulting in the peeling off of the electrostatic spraying film, which does not play the role of passivation to improve the corrosion resistance of the coating, the protection of non-ferrous metals, and the role of improving the adhesion of the coating, and the passivation time Slow, passivation efficien...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no stirring device for the solution in the passivation tank, so the distribution of chromium ions in the passivation tank is uneven, and precipitation crystals will appear at the bottom of the tank, resulting in uneven passivation of the workpiece, uneven passivation film thickness, and even passivation cannot be formed in some places. Film, crystalline impurities adhere to the dead corners of the workpiece and are not easy to clean, resulting in the peeling off of the electrostatic spraying film, which does not play the role of passivation to improve the corrosion resistance of the coating, the protection of non-ferrous metals, and the role of improving the adhesion of the coating, and the passivation time Slow, passivation efficiency is not high

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