Brass surface passivation treating agent and application method thereof

Abstract

The invention discloses a brass surface passivation treating agent and an application method thereof, and relates to the technical field of lubrication of metal parts. The application method comprises the following steps: passivant is prepared; 200-250 g / L of butyric anhydride, 30-50 g / L of nitric acid and 300 g / L of zinc stearate solution are put in a preparation bottle for preparing the passivant; the temperature of preparing the passivant is controlled at 20 DEG C; parts are flushed by hot water at a temperature of 60-120 DEG C, are secondarily cleaned by using cold water after the flushing is finished, and are put in a passivation pool to perform the passivation treatment for 5-10 S after the cleaning is finished; after the parts are flushed for the third time by using the cold water after being taken out, and are flushed for the fourth time by using the hot water; after the flushing is finished, the parts are taken out for airing, and are dried and stacked; and the passivation treatment process is finished. The brass surface passivation treating agent has good lubricating effect, in particular can prevent an inner hole wall from generating cracks when extruding hollow pieces, and facilitates the promotion of product quality.

Description

Technical field: [0001] The invention relates to the technical field of lubrication of metal parts, in particular to a brass surface passivation treatment agent and an application method thereof. Background technique: [0002] Cold extrusion technology is widely used as a method of producing chip-free or less-chip parts and products, and with the development of technology, this technology has been expanded to the production of many low-alloy steels, stainless steels, copper alloys, and low-plastic duralumin. middle. Compared with hot extrusion, cold extrusion has a lower temperature, even under continuous working conditions, it is beneficial for deformation heat effect and process lubrication. However, it is necessary to make much extrusion force in the die at room temperature, the unit pressure can generally reach 2000-2500MPa, or even greater, and the duration of this high pressure is also longer. Due to the cold extrusion, the deformed metal will produce a strong cold h...

AI Technical Summary

Problems solved by technology

Due to cold extrusion, the deformed metal will produce strong cold hardening phenomenon, which will lead to further improvement of deformation resistance.

In addition, due to the large amount of deformation during cold extrusion, the newly generated surface area increases greatly, and the nascent metal and the mold may adhere without lubrication, which worsens the lubrication conditions and affects whether the billet can be formed, as well as the quality and quality of the product. Die life, therefore, the lubricant for cold extrusion is required to significantly reduce the coefficient of friction, to ensure good lubrication performance at a certain temperature and high pressure, to have good ductility and easy to operate, non-toxic, and no strange Odor and cheap, especially when using brass to extrude hollow parts, due to poor metal lubrication, cracks often occur on the inner hole wall, which directly affects the quality of the workpiece